CompTIA Network+ practice questions

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8 contested answers

Questions: 25
Explanations: 25
Candidate context: 25
Question citations: 3

25 questions in this bank

Question 1 of 25
Which of the following technologies are X.509 certificates most commonly associated with?
Show answer
Correct answer: A
How others answered
A100%
Explanation
The correct answer is A: PKI (Public Key Infrastructure) The other options are less suitable because: VLAN tagging (B): This is a networking concept unrelated to certificate-based security LDAP (C): While LDAP can use certificates, it's primarily a directory service protocol MFA (D): While certificates can be used in MFA, they are just one of many possible authentication factors
Adapted from community discussion by chupapi_001 · 2024-10-26 · 5 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
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Question 1 discussion
These are quality-filtered excerpts from third-party community discussion. They can be useful reasoning signals, but they are not official answers and have not been independently verified by N10-009 or CertExamHQ.
C
chupapi_001
2024-10-26
Selected A5 upvotes
The correct answer is A: PKI (Public Key Infrastructure) The other options are less suitable because: VLAN tagging (B): This is a networking concept unrelated to certificate-based security LDAP (C): While LDAP can use certificates, it's primarily a directory service protocol MFA (D): While certificates can be used in MFA, they are just one of many possible authentication factors
H
HeatSquad77
2024-12-30
Selected A2 upvotes
A. public-key infrastructure (PKI) The system for creating and distributing digital certificates issued by trusted third parties such as DigiCert, GoDaddy, or Sectigo.
A
Abx_01
2025-02-18
Selected A2 upvotes
Public Key Infrastructure (PKI) is the set of technology and processes required to secure environments with high assurance to control access to systems
Question 2 of 25
A network administrator wants to configure a backup route in case the primary route fails. A dynamic routing protocol is not installed on the router. Which of the following routing features should the administrator choose to accomplish this task?
Show answer
Correct answer: C
How others answered
C69%
D31%
Only 69% agreed on this answer — treat it as contested rather than settled.
Explanation
I'm a bit torn here. Both Hop Count and Administrative Distance seem relevant, but I need to think about the context. Since the routing protocol isn't dynamic, they might be using static routing or have administrative nodes set up certain rules based on hop counts. Therefore, choosing Administrative Distance could make sense as a way to configure backup routes by applying administrative criteria that include hop counts. But then again, hop count is more of a metric used during route discovery and management rather than an administrative setting for backup routing. So, perhaps the correct answer is D. Hop Count if they're using static routing based on known network segments, or C. Administrative distance as an administrative rule that includes hop counts. I'm still leaning towards C. Administrative distance because it allows applying administrative criteria like considering hop count when setting up backup routes.
Adapted from community discussion by 93831b0 · 2025-02-06 · 2 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
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Question 2 discussion
These are quality-filtered excerpts from third-party community discussion. They can be useful reasoning signals, but they are not official answers and have not been independently verified by N10-009 or CertExamHQ.
9
93831b0
2025-02-06
Selected C2 upvotes
I'm a bit torn here. Both Hop Count and Administrative Distance seem relevant, but I need to think about the context. Since the routing protocol isn't dynamic, they might be using static routing or have administrative nodes set up certain rules based on hop counts. Therefore, choosing Administrative Distance could make sense as a way to configure backup routes by applying administrative criteria that include hop counts. But then again, hop count is more of a metric used during route discovery and management rather than an administrative setting for backup routing. So, perhaps the correct answer is D. Hop Count if they're using static routing based on known network segments, or C. Administrative distance as an administrative rule that includes hop counts. I'm still leaning towards C. Administrative distance because it allows applying administrative criteria like considering hop count when setting up backup routes.
H
HeatSquad77
2025-01-06
Selected C2 upvotes
C. Administrative distance Explanation: Administrative distance (AD) is a value used by routers to prioritize routes when multiple routes to the same destination are available. By configuring static routes with different administrative distances, the network administrator can set one route as the primary (lower AD) and another as the backup (higher AD). If the primary route fails, the router will automatically switch to the backup route with the higher AD.
B
Big_Wes
2025-02-13
Selected C2 upvotes
it states "A dynamic protocol is not installed on the router", Hop count cannot manage backup routes without this. C. Administrative Distance
B
b359e92
2025-01-29
Selected C2 upvotes
GPT C. Administrative distance Administrative Distance – It allows the router to prioritize a backup static route if the primary route fails.
Question 3 of 25
Which of the following steps of the troubleshooting methodology should a technician take to confirm a theory?
Show answer
Correct answer: A
How others answered
A100%
Explanation
A. Duplicate the problem. Explanation: To confirm a theory, a technician needs to reproduce the issue under similar conditions to ensure the identified cause matches the symptoms and behavior of the problem. Duplicating the problem helps validate the theory and provides evidence that the suspected cause is correct.
Adapted from community discussion by HeatSquad77 · 2025-01-06 · 2 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
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Question 3 discussion
These are quality-filtered excerpts from third-party community discussion. They can be useful reasoning signals, but they are not official answers and have not been independently verified by N10-009 or CertExamHQ.
H
HeatSquad77
2025-01-06
Selected A2 upvotes
A. Duplicate the problem. Explanation: To confirm a theory, a technician needs to reproduce the issue under similar conditions to ensure the identified cause matches the symptoms and behavior of the problem. Duplicating the problem helps validate the theory and provides evidence that the suspected cause is correct.
G
GT256
2024-11-11
Selected A2 upvotes
I think "A" is correct. You're right though, all these choices are part of the information-gathering phase but the only choice that can allow you to directly confirm your theory is by "duplicating the problem" (again) after making some changes.
E
ec80b38
2024-11-06
1 upvote
This should be C but Correct me if im wrong under step three on the comptia website it is said this step is also part of the "information-gathering" phase
M
MIXDBAG
2024-11-11
1 upvote
Duplicating the problem is what confirms the theory, the answer is A
Question 4 of 25
A network administrator wants to implement an authentication process for temporary access to an organization's network. Which of the following technologies would facilitate this process?
Show answer
Correct answer: A
How others answered
A100%
Explanation
The correct answer is A: Captive portal. Captive portals are specifically designed for temporary access management. The other options are less suitable because: Enterprise authentication (B): This is more suited for permanent employees and requires complex setup Ad hoc network (C): This refers to a temporary network structure, not an authentication method WPA3 (D): This is an encryption standard for securing wireless networks, not specifically for managing temporary access
Adapted from community discussion by chupapi_001 · 2024-10-26 · 8 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
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Question 4 discussion
These are quality-filtered excerpts from third-party community discussion. They can be useful reasoning signals, but they are not official answers and have not been independently verified by N10-009 or CertExamHQ.
C
chupapi_001
2024-10-26
Selected A8 upvotes
The correct answer is A: Captive portal. Captive portals are specifically designed for temporary access management. The other options are less suitable because: Enterprise authentication (B): This is more suited for permanent employees and requires complex setup Ad hoc network (C): This refers to a temporary network structure, not an authentication method WPA3 (D): This is an encryption standard for securing wireless networks, not specifically for managing temporary access
H
HeatSquad77
2024-12-30
Selected A2 upvotes
A. captive portal A Wi-Fi network implementation used in some public facilities that directs attempts to connect to the network to an internal Web page for that facility; generally used to force terms of service on users.
F
favouralain
2024-11-27
Selected A1 upvote
A captive portal is a web page that users see before accessing a public network. Users typically need to provide some form of authentication, such as logging in with temporary credentials, before they can access the network. This is particularly useful for temporary access as it can be used to enforce network access policies and gather user information.
C
chrys
2024-11-10
1 upvote
Captive portal is what we all do. It's easy, self-service, and you can log MAC addresses and user email addresses without any work on your part.
Question 5 of 25
An office is experiencing intermittent connection issues. A network engineer identifies that the issue occurs whenever someone uses the fax machine that is connected to a switch. Which of the following should the engineer do first to resolve the issue?
Show answer
Correct answer: D
How others answered
D88%
Explanation
D. Configure a VLAN. Explanation: The issue described suggests that the fax machine, which is likely generating a high amount of traffic or interference, is causing disruption to other devices on the same network segment. In this case, placing the fax machine on a separate VLAN can help isolate it from other devices and prevent it from interfering with regular network traffic.
Adapted from community discussion by HeatSquad77 · 2025-01-06 · 4 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
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Question 5 discussion
These are quality-filtered excerpts from third-party community discussion. They can be useful reasoning signals, but they are not official answers and have not been independently verified by N10-009 or CertExamHQ.
H
HeatSquad77
2025-01-06
Selected D4 upvotes
D. Configure a VLAN. Explanation: The issue described suggests that the fax machine, which is likely generating a high amount of traffic or interference, is causing disruption to other devices on the same network segment. In this case, placing the fax machine on a separate VLAN can help isolate it from other devices and prevent it from interfering with regular network traffic.
O
ojones888
2024-11-18
5 upvotes
Running a new Cat 5 cable could potentially help if there is a physical connection issue, but it is unlikely to address the specific issue of intermittent connection problems caused by the fax machine. The problem seems more related to network configuration rather than the physical connection.
J
jmcd2
2025-01-02
Selected D2 upvotes
D Configure a VLAN The fax machine's network traffic could be causing interference or broadcast issues that disrupt other devices on the same network. By configuring a VLAN (Virtual Local Area Network), the engineer can isolate the traffic from the fax machine onto its own separate network segment, preventing it from affecting other devices.
E
escomgmt
2024-11-14
1 upvote
A. Run a new Cat 5 line, Intermittent connection issues when a fax machine (often analog and potentially connected through a VoIP adapter or similar setup) is in use suggest possible interference or crosstalk on the current cable. Running a new, dedicated Cat 5 line for the fax machine would isolate it from the rest of the network traffic on the switch, reducing interference and connection problems. This is a straightforward approach to eliminate potential issues with shared cabling or interference.
Question 6 of 25
A user is unable to navigate to a website because the provided URL is not resolving to the correct IP address. Other users are able to navigate to the intended website without issue. Which of the following is most likely causing this issue?
Show answer
Correct answer: A
How others answered
A100%
Explanation
The hosts file is a local system file that maps hostnames to IP addresses and can override normal DNS resolution . When only one user is experiencing resolution issues while others can access the website normally, this strongly suggests a local configuration problem rather than a network-wide DNS issue.
Adapted from community discussion by chupapi_001 · 2024-10-26 · 4 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
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Question 6 discussion
These are quality-filtered excerpts from third-party community discussion. They can be useful reasoning signals, but they are not official answers and have not been independently verified by N10-009 or CertExamHQ.
C
chupapi_001
2024-10-26
Selected A4 upvotes
The hosts file is a local system file that maps hostnames to IP addresses and can override normal DNS resolution . When only one user is experiencing resolution issues while others can access the website normally, this strongly suggests a local configuration problem rather than a network-wide DNS issue.
H
HeatSquad77
2024-12-30
Selected A4 upvotes
A. hosts file The predecessor to DNS, a static text file that resides on a computer and is used to resolve DNS hostnames to IP addresses. Automatically mapped to a host’s DNS resolver cache in modern systems. The hosts file has no extension.
C
chrys
2024-11-10
2 upvotes
Hosts file is checked before DNS. It's actually a fun and simple way to hack a system. I had to use it once to keep users from using a PC running an XRAY controller to get on Facebook and other social media sites. Quick 'n' dirty ;-)
Question 7 of 25
A network administrator configured a router interface as 10.0.0.95 255.255.255.240. The administrator discovers that the router is not routing packets to a web server with IP 10.0.0.81/28. Which of the following is the best explanation?
Show answer
Correct answer: B
How others answered
B100%
Explanation
answer is B 255.255.255.240 is /28, and has 16 addresses Network Address: 10.0.0.80 First usable: 10.0.0.81 *Web Server* Last usable: 10.0.0.94 Last IP / Broadcast IP: 10.0.0.95 *Router* Next network: 10.0.0.96 Maybe the network admin wanted to assign the router 10.0.0.94 (last usable IP for network 10.0.0.80/28), thankfully this shouldn't happen because companies always emphasise attention to detail on job postings Dennizje is right
Adapted from community discussion by GT256 · 2024-11-11 · 4 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
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Question 7 discussion
These are quality-filtered excerpts from third-party community discussion. They can be useful reasoning signals, but they are not official answers and have not been independently verified by N10-009 or CertExamHQ.
G
GT256
2024-11-11
Selected B4 upvotes
answer is B 255.255.255.240 is /28, and has 16 addresses Network Address: 10.0.0.80 First usable: 10.0.0.81 *Web Server* Last usable: 10.0.0.94 Last IP / Broadcast IP: 10.0.0.95 *Router* Next network: 10.0.0.96 Maybe the network admin wanted to assign the router 10.0.0.94 (last usable IP for network 10.0.0.80/28), thankfully this shouldn't happen because companies always emphasise attention to detail on job postings Dennizje is right
D
Dennizje
2024-11-03
Selected B3 upvotes
It's B. The Network address is 10.0.0.80. So the printer is NOT in a different subnet. Subnet is /28. Last octet is 01011111. From the last octet, the first 4 are static. Since the last 4 bits are all occupied, it is the last possible IP address of the subnet before moving on to the next. The last possible IP address is the broadcast address. People voting A are just assuming because it's a common answer on practice tests.
E
escomgmt
2024-11-11
2 upvotes
A, The router interface is configured with IP 10.0.0.95 and a subnet mask of 255.255.255.240, which translates to a /28 subnet (or 16 IP addresses per subnet). The address range for the subnet that includes 10.0.0.95/28 is 10.0.0.80 - 10.0.0.95. However, 10.0.0.81 is within this subnet, but 10.0.0.95 is the broadcast address for the subnet, meaning the router's configuration on 10.0.0.95 isn't appropriate for routing directly to 10.0.0.81.
Question 8 of 25
A critical infrastructure switch is identified as end-of-support. Which of the following is the best next step to ensure security?
Show answer
Correct answer: B
How others answered
B85%
Explanation
B. Decommission and replace the switch. Explanation: An end-of-support (EOS) device no longer receives security updates, patches, or vendor support. This makes it vulnerable to exploits and security risks, as there will be no fixes for known vulnerabilities. The most effective and secure approach in this situation is to decommission and replace the outdated switch with a supported model that will continue to receive security updates and patches.
Adapted from community discussion by HeatSquad77 · 2025-01-06 · 4 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
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Question 8 discussion
These are quality-filtered excerpts from third-party community discussion. They can be useful reasoning signals, but they are not official answers and have not been independently verified by N10-009 or CertExamHQ.
H
HeatSquad77
2025-01-06
Selected B4 upvotes
B. Decommission and replace the switch. Explanation: An end-of-support (EOS) device no longer receives security updates, patches, or vendor support. This makes it vulnerable to exploits and security risks, as there will be no fixes for known vulnerabilities. The most effective and secure approach in this situation is to decommission and replace the outdated switch with a supported model that will continue to receive security updates and patches.
B
b82faaf
2024-11-27
Selected B4 upvotes
B. Decommission and replace the switch. End-of-support (EOS) simply means that the vendor will no longer provide updates, patches, or technical support for the switch.
S
SuntzuLegacy
2024-12-01
4 upvotes
While applying the latest patches is important, it is not sufficient for an EOS switch, as no future updates will be available to address new vulnerabilities. So in this case B is the best answer.
H
Hayder81
2024-12-09
Selected B2 upvotes
End-of-support (EOS) simply means that the vendor will no longer provide updates, patches, or technical support for the switch.
Question 9 of 25
A network administrator is planning to host a company application in the cloud, making the application available for all internal and third-party users. Which of the following concepts describes this arrangement?
Show answer
Correct answer: A
How others answered
A69%
D31%
Only 69% agreed on this answer — treat it as contested rather than settled.
Explanation
While SaaS and Multitenancy have similar definitions SaaS would more so be the actual delivery of the model, or the accessing of the service while multitenancy describes the scenario of an admin hosting this application.
Adapted from community discussion by TheSplurge · 2025-01-07 · 7 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
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Question 9 discussion
These are quality-filtered excerpts from third-party community discussion. They can be useful reasoning signals, but they are not official answers and have not been independently verified by N10-009 or CertExamHQ.
T
TheSplurge
2025-01-07
Selected A7 upvotes
While SaaS and Multitenancy have similar definitions SaaS would more so be the actual delivery of the model, or the accessing of the service while multitenancy describes the scenario of an admin hosting this application.
2
2fd1029
2025-01-08
8 upvotes
Piss off with the ChatGPT answer. ChatGPT gets things wrong all the time and there's a chance you're screwing people over with your misinformation.
G
GEO2
2025-01-27
Selected A3 upvotes
Multitenancy is a cloud computing concept where a single instance of an application serves multiple users (tenants). In this case, the company application is hosted in the cloud and is available for both internal users and third-party users, meaning it supports multiple groups (or tenants) sharing the same application infrastructure while keeping their data isolated. Why not the others? D. SaaS (Software as a Service): While this application might be offered as a SaaS product, the question focuses on the arrangement where multiple users access the same hosted application, which aligns better with multitenancy. Key Takeaway: Multitenancy ensures efficient resource usage in cloud environments while securely serving multiple user groups or organizations.
J
jmcd2
2025-01-19
Selected A4 upvotes
A. third party users that means people outside the company. Multitenancy is the best answer.
Question 10 of 25
Which of the following routing protocols uses an autonomous system number?
Show answer
Correct answer: C
How others answered
C78%
D22%
Explanation
C. BGP. According to CompTIA: "Autonomous system numbers (ASN) are allocated to ISPs by IANA via the various regional registries. BGP is a type of exterior gateway protocol (in fact, it replaced a protocol named EGP) for communications between routers in separate autonomous systems. When BGP is used within an AS, it is referred to as Interior BGP (IBGP), and when implemented between autonomous systems, it is referred to as Exterior BGP (EBGP)." Refeerance CompTIA Network + Study Guide.
Adapted from community discussion by Nanox · 2025-02-06 · 3 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
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Question 10 discussion
These are quality-filtered excerpts from third-party community discussion. They can be useful reasoning signals, but they are not official answers and have not been independently verified by N10-009 or CertExamHQ.
N
Nanox
2025-02-06
Selected C3 upvotes
C. BGP. According to CompTIA: "Autonomous system numbers (ASN) are allocated to ISPs by IANA via the various regional registries. BGP is a type of exterior gateway protocol (in fact, it replaced a protocol named EGP) for communications between routers in separate autonomous systems. When BGP is used within an AS, it is referred to as Interior BGP (IBGP), and when implemented between autonomous systems, it is referred to as Exterior BGP (EBGP)." Refeerance CompTIA Network + Study Guide.
H
HeatSquad77
2025-01-06
Selected C2 upvotes
C. BGP BGP (Border Gateway Protocol) is the routing protocol that uses an Autonomous System Number (ASN). This is used to identify unique networks or groups of networks in different organizations and is critical for inter-domain routing between different ASes on the internet
9
93831b0
2025-02-23
Selected C1 upvote
EIGRP uses autonomous system number, but it is mainly used for identification and redistribution purposes and not for core path selection like BGP.
F
Fosterboi
2025-02-03
Selected C1 upvote
I looked up other sources and I consistently found BGP to be the answer.
Question 11 of 25
Which of the following best describes the transmission format that occurs at the transport layer over connectionless communication?
Show answer
Correct answer: A
How others answered
A64%
B36%
Only 64% agreed on this answer — treat it as contested rather than settled.
Explanation
A. Datagrams are used in connectionless communication protocols like TCP and UDP at the transport layer. Datagrams are fundamental units of transmission, representing segments of data for error detection and retransmission.
Adapted from community discussion by 93831b0 · 2025-02-06 · 2 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
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These are quality-filtered excerpts from third-party community discussion. They can be useful reasoning signals, but they are not official answers and have not been independently verified by N10-009 or CertExamHQ.
H
HeatSquad77
2024-12-30
Selected A5 upvotes
A. Datagram A connectionless transfer unit created with User Datagram Protocol designed for quick transfers over a packet-switched network
9
93831b0
2025-02-06
Selected A2 upvotes
A. Datagrams are used in connectionless communication protocols like TCP and UDP at the transport layer. Datagrams are fundamental units of transmission, representing segments of data for error detection and retransmission.
F
fc040c7
2025-03-20
Selected A2 upvotes
“Connectionless” is the keyword. I first skipped right over that ajd said segments as well. TCP - segments UDP - user DATAGRAM protocol….
F
FrozenCarrot
2025-02-05
2 upvotes
Segment: This term is typically used for connection-oriented communication, as seen with TCP. Datagram: This term is used for connectionless communication, such as with UDP.
Question 12 of 25
Which of the following steps in the troubleshooting methodology comes after using a top-to-bottom examination of the OSI model to determine cause?
Show answer
Correct answer: A
How others answered
A67%
B20%
Only 67% agreed on this answer — treat it as contested rather than settled.
Explanation
You should be able to establish a theory using the OSI model, that is its intended use after all. Test the theory is next.
Adapted from community discussion by CalicoJack · 2025-02-10 · 4 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
Supporting references
comptia.org documentation
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These are quality-filtered excerpts from third-party community discussion. They can be useful reasoning signals, but they are not official answers and have not been independently verified by N10-009 or CertExamHQ.
C
CalicoJack
2025-02-10
Selected A4 upvotes
You should be able to establish a theory using the OSI model, that is its intended use after all. Test the theory is next.
E
ExamLSMotor
2025-02-10
Selected A3 upvotes
The steps are: 1. Identify the problem 2. Establish a theory of probable cause 3. Test the theory 4. Implement a solution or escalate 5. Verify functionality 6. Document findings After step 2 we move on to 3, "test the theory". A is the correct answer.
C
CISUMPATR
2025-02-10
Selected A2 upvotes
Correct answer is A because, examination of the OSI Model simply means "Establish a Theory of Probable Cause" according to Comptia, indicating the next step to be test the theory
K
Knekworst
2025-02-12
1 upvote
This one pisses me off. The CompTIA troubleshooting methodology references to the OSI is to vague! This is why these exams are predatory. I would Select. B Comptia references by checking the OSI-model during ''3. Test the Theory'' What comes after Test the Theory? ''Establish a plan of action'' So... the right answer is: B: Establish a plan of action. Reference: https://www.comptia.org/blog/troubleshooting-methodology
Question 13 of 25
Which of the following attacks can cause users who are attempting to access a company website to be directed to an entirely different website?
Show answer
Correct answer: A
How others answered
A89%
Explanation
A. DNS cache poisoning Also known as DNS poisoning, an attack that adds or changes information in a DNS server’s cache to point hostnames to incorrect IP addresses, under the attacker’s control. When a client requests an IP address from this DNS server for a Web site, the poisoned server hands out an IP address of an attacker machine, not the legitimate site. When the client subsequently visits the attacker site, they become vulnerable to a number of threats including malware.
Adapted from community discussion by HeatSquad77 · 2024-12-30 · 2 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
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These are quality-filtered excerpts from third-party community discussion. They can be useful reasoning signals, but they are not official answers and have not been independently verified by N10-009 or CertExamHQ.
H
HeatSquad77
2024-12-30
Selected A2 upvotes
A. DNS cache poisoning Also known as DNS poisoning, an attack that adds or changes information in a DNS server’s cache to point hostnames to incorrect IP addresses, under the attacker’s control. When a client requests an IP address from this DNS server for a Web site, the poisoned server hands out an IP address of an attacker machine, not the legitimate site. When the client subsequently visits the attacker site, they become vulnerable to a number of threats including malware.
B
ba10f26
2024-12-18
Selected A1 upvote
The correct answer is: A. DNS poisoning. DNS poisoning (or DNS spoofing) involves corrupting the DNS cache or records to redirect users from a legitimate website to a fraudulent or malicious website. This type of attack can deceive users and potentially capture sensitive information.
C
chupapi_001
2024-10-26
2 upvotes
The correct answer is A. DNS poisoning DNS poisoning is a type of cyber attack that specifically causes users to be redirected to malicious websites when they attempt to access legitimate ones.
D
Dennizje
2024-10-30
Selected A1 upvote
It is DNS poisoning, the DNS is generally what the user is clicking on in good faith.
Question 14 of 25
Which of the following is the next step to take after successfully testing a root cause theory?
Show answer
Correct answer: A
How others answered
A81%
D19%
Explanation
From CompTIA's website, the troubleshooting steps are as follows: 1.) Identify the problem 2.) Establish a theory of probable cause 3.) Test the theory to determine the cause 4.) Establish a plan of action to resolve the problem 5.) Implement the solution and escalate if necessary 6.) Verify full system functionality, and if possible implement preventative measures 7.) Document findings, actions, outcomes, and lessons learned. With this in mind, A would be the correct answer, as it would be establishing a plan of action after testing the theory to determine the cause of the problem.
Adapted from community discussion by FrostyBoi · 2024-11-04 · 13 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
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F
FrostyBoi
2024-11-04
Selected A13 upvotes
From CompTIA's website, the troubleshooting steps are as follows: 1.) Identify the problem 2.) Establish a theory of probable cause 3.) Test the theory to determine the cause 4.) Establish a plan of action to resolve the problem 5.) Implement the solution and escalate if necessary 6.) Verify full system functionality, and if possible implement preventative measures 7.) Document findings, actions, outcomes, and lessons learned. With this in mind, A would be the correct answer, as it would be establishing a plan of action after testing the theory to determine the cause of the problem.
B
BobbyCruz111
2024-11-10
2 upvotes
Explanation of the other options: B. Duplicate the problem in a lab: This step is typically taken earlier in the troubleshooting process when you're trying to recreate the issue in a controlled environment to better understand its causes. After confirming the root cause theory, you don't need to duplicate the problem again; you're already at the point where you know what the issue is. C. Present the theory for approval: While presenting the theory for approval might be important in some organizational settings (particularly for formal change management), it's not typically the next step after confirming the root cause. At this stage, you would already have the necessary buy-in to proceed with resolution steps. D. Implement the solution to the problem: Implementing the solution is a crucial step, but it comes after determining the specific resolution steps. First, you need to decide on the best course of action, including testing and validating the solution, and then implement it in a controlled way.
B
ba10f26
2024-12-18
Selected A2 upvotes
With the information provided from the CompTIA troubleshooting steps, the correct answer: A. Determine resolution steps. This step aligns with CompTIA's methodology: after testing the theory and determining the root cause, the next logical step is to establish a plan of action to resolve the problem, before implementing the solution. This ensures a clear, organized approach to addressing the issue.
B
BobbyCruz111
2024-11-10
Selected A2 upvotes
Once the root cause theory has been successfully tested and confirmed, the next logical step is to determine the resolution steps. These steps involve identifying how to fix the problem, including creating a plan to address the issue, implementing the solution, and ensuring that the solution will effectively resolve the issue without causing new problems.
Question 15 of 25
A customer needs six usable IP addresses. Which of the following best meets this requirement?
Show answer
Correct answer: D
How others answered
D77%
C23%
Explanation
The ideal mask would be 255.255.255.248 which would give us exactly the right amount of usable addresses at 6, but the next best is D. with 14 usable address
Adapted from community discussion by kinkistyle · 2025-01-18 · 4 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
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K
kinkistyle
2025-01-18
Selected D4 upvotes
The ideal mask would be 255.255.255.248 which would give us exactly the right amount of usable addresses at 6, but the next best is D. with 14 usable address
P
Powerserg28
2024-12-12
Selected D3 upvotes
255.255.255.240 = 11111111.1111111.1111111.11110000 Number of networks = 2^n; n = on bits (1); 2^4 = 16 Number of host = (2^n) - 2; n = off bits (0); (2^4) - 2 = 14
B
ba10f26
2024-12-18
Selected D1 upvote
Correct Answer: D 255.255.255.240 provides 14 usable IP addresses, which is more than enough for the 6 usable IPs the customer needs. This option is more efficient compared to 255.255.255.224, which provides 30 usable IPs and would waste a larger number of addresses.
C
chupapi_001
2024-10-29
Selected D1 upvote
Since the customer needs 6 usable IP addresses, we should choose the smallest subnet that can accommodate this requirement while minimizing wasted addresses. 255.255.255.240 provides 14 usable addresses, which is the closest match to the requirement of 6 addresses.
Question 16 of 25
A network technician needs to install patch cords from the UTP patch panel to the access switch for a newly occupied set of offices. The patch panel is not labeled for easy jack identification. Which of the following tools provides the easiest way to identify the appropriate patch panel port?
Show answer
Correct answer: A
How others answered
A100%
Explanation
A. toner Generic term for two devices used together—a tone generator and a tone locator (probe)—to trace cables by sending an electrical signal along a wire at a particular frequency. The tone locator then emits a sound when it distinguishes that frequency. Also referred to as Fox and Hound
Adapted from community discussion by HeatSquad77 · 2024-12-30 · 5 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
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H
HeatSquad77
2024-12-30
Selected A5 upvotes
A. toner Generic term for two devices used together—a tone generator and a tone locator (probe)—to trace cables by sending an electrical signal along a wire at a particular frequency. The tone locator then emits a sound when it distinguishes that frequency. Also referred to as Fox and Hound
E
escomgmt
2024-11-11
3 upvotes
A toner (also known as a tone generator and probe) is the easiest tool to use for identifying the appropriate patch panel port when the ports are not labeled. It works by sending a tone down the cable, which can be traced with the probe at the other end, helping the technician quickly identify the corresponding patch panel port.
F
favouralain
2024-11-27
Selected A2 upvotes
Toner is the easiest tool to identify the appropriate patch panel port
F
FrostyBoi
2024-11-04
1 upvote
C, Cable tester. In this scenario a cable tester can verify the connectivity of one end of the cable, while you can test each of the ports of the patch panel to see where the connection is easily. A Toner on the other hand (I think they are trying to refer to a tone generator probe?) Would not work as well, since you'd send a signal down a cable, and test for an already patched cable to be giving off the tone for the probe to read.
Question 17 of 25
A company wants to implement a disaster recovery site for non-critical applications, which can tolerate a short period of downtime. Which of the following types of sites should the company implement to achieve this goal?
Show answer
Correct answer: C
How others answered
C89%
Explanation
C. Warm Explanation: A warm site is suitable for non-critical applications that can tolerate a short period of downtime. Warm sites typically have some infrastructure and equipment already in place, but they may need additional setup or data synchronization before they can be fully operational. This makes warm sites a balanced choice for companies that need faster recovery than a cold site but do not require the immediate availability of a hot site.
Adapted from community discussion by TreyPar3 · 2024-11-07 · 4 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
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T
TreyPar3
2024-11-07
Selected C4 upvotes
C. Warm Explanation: A warm site is suitable for non-critical applications that can tolerate a short period of downtime. Warm sites typically have some infrastructure and equipment already in place, but they may need additional setup or data synchronization before they can be fully operational. This makes warm sites a balanced choice for companies that need faster recovery than a cold site but do not require the immediate availability of a hot site.
B
ba4cbc8
2024-12-02
Selected C3 upvotes
Warm Sites are sites that include a small amount of downtime and have the services that can be started within a short time. Hot sites are available immediately as they constantly keep the same standards as the main workcenter. Cold sites typically require more extensive updates/personnel to go to the installation and take a slightly longer time than a warm site to become operational.
B
b82faaf
2024-12-02
3 upvotes
I take this back. After checking more closely, especially considering the keywords " 'short' period of time", I believe the answer should be C. Warm
H
HeatSquad77
2024-12-30
Selected C1 upvote
C. warm site Facility with all of the physical resources, computers, and network infrastructure to recover from a primary site disaster. A warm site does not have current backup data and it may take a day or more to recover and install backups before business operations can recommence.
Question 18 of 25
Which of the following does OSPF use to communicate routing updates?
Show answer
Correct answer: C
How others answered
C88%
Explanation
The correct answer is: C. Multicast OSPF (Open Shortest Path First) uses multicast to communicate routing updates with other routers. Specifically, it sends updates to the following multicast addresses: 224.0.0.5: All OSPF routers 224.0.0.6: All OSPF designated routers (DRs) Using multicast allows OSPF to efficiently share routing information only with routers that are configured to participate in the OSPF process, rather than broadcasting to all devices on the network.
Adapted from community discussion by ba10f26 · 2024-12-18 · 4 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
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B
ba10f26
2024-12-18
Selected C4 upvotes
The correct answer is: C. Multicast OSPF (Open Shortest Path First) uses multicast to communicate routing updates with other routers. Specifically, it sends updates to the following multicast addresses: 224.0.0.5: All OSPF routers 224.0.0.6: All OSPF designated routers (DRs) Using multicast allows OSPF to efficiently share routing information only with routers that are configured to participate in the OSPF process, rather than broadcasting to all devices on the network.
H
HeatSquad77
2024-12-31
Selected C2 upvotes
C. multicast Method of sending a packet in which the sending computer sends it to a group of interested computers.
E
efe498c
2024-12-12
Selected C1 upvote
The answer is OSPF uses multicast to communicate routing updates.
L
lord_darth_vader
2024-12-05
1 upvote
FATAL ERROR! I apologize for the confusion here. Garrett said it was B not D.
Question 19 of 25
A network technician is troubleshooting a faulty NIC and tests the theory. Which of the following should the technician do next?
Show answer
Correct answer: B
How others answered
B100%
Explanation
B. Establish plan of action. Thiis is step four in the Basic Network Troubleshooting Steps. CompTia States: "Once you’ve confirmed your theory about the causes of the network issues, you’re in a position to solve them. Come up with a plan of action to address the problem. Sometimes your plan will include just one step. For example, restart the router. In other cases, your plan will be more complex and take longer, such as when you need to order a new part or roll a piece of software back to a previous version on multiple users’ computers." Referances: https://www.comptia.org/content/guides/a-guide-to-network-troubleshooting
Adapted from community discussion by Nanox · 2025-02-05 · 2 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
Supporting references
comptia.org documentation
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N
Nanox
2025-02-05
Selected B2 upvotes
B. Establish plan of action. Thiis is step four in the Basic Network Troubleshooting Steps. CompTia States: "Once you’ve confirmed your theory about the causes of the network issues, you’re in a position to solve them. Come up with a plan of action to address the problem. Sometimes your plan will include just one step. For example, restart the router. In other cases, your plan will be more complex and take longer, such as when you need to order a new part or roll a piece of software back to a previous version on multiple users’ computers." Referances: https://www.comptia.org/content/guides/a-guide-to-network-troubleshooting
Question 20 of 25
Which of the following steps of the troubleshooting methodology would most likely include checking through each level of the OSI model after the problem has been identified?
Show answer
Correct answer: A
How others answered
A67%
D29%
Only 67% agreed on this answer — treat it as contested rather than settled.
Explanation
I just passed N10-009 this past weekend, 11.9.24 using these questions. I studied the 159 questions and they were a lifesaver. I also got all 6 scenario questions, the first one was very complicated and I gave up and moved on. I saved the scenarios for last and they took 50 min to go through. Study all 159 questions the answers given. It's worth it. I got a 836 for my score even not doing well with a couple of the scenario questions!!
Adapted from community discussion by a484b2b · 2024-11-12 · 19 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
Supporting references
comptia.org documentation
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A
a484b2b
2024-11-12
19 upvotes
I just passed N10-009 this past weekend, 11.9.24 using these questions. I studied the 159 questions and they were a lifesaver. I also got all 6 scenario questions, the first one was very complicated and I gave up and moved on. I saved the scenarios for last and they took 50 min to go through. Study all 159 questions the answers given. It's worth it. I got a 836 for my score even not doing well with a couple of the scenario questions!!
N
Nyang2
2024-11-19
10 upvotes
https://www.comptia.org/blog/troubleshooting-methodology 1. Identify the problem 2. Establish a theory of probable cause ===> Answer : A 3. Test the theory to determine the cause 4. Establish a plan of action to resolve the problem and identify potential effects 5. Implement the solution or escalate as necessary 6. Verify full system functionality and, if applicable, implement preventive measures 7. Document findings, actions, outcomes and lessons learned
K
KD603
2024-11-06
Selected A3 upvotes
The next step after identifying the problem is establishing a theory of probable cause which can include considering multiple approaches: top-to-bottom or bottom-to-top OSI model approaches. Verify functionality would include OSI model but only after implementing the solution which hasn't happened in this question
B
b82faaf
2024-11-27
Selected A2 upvotes
A. Establish a theory According to the CompTIA troubleshooting methodology, once the problem has been identified, the next step is to establish a theory of probable cause. This involves systematically analyzing the problem and narrowing down potential causes. Checking through each level of the OSI model is a common practice at this stage to identify where the issue might be occurring.
Question 21 of 25
A customer lost the connection to the telephone system. The administration console is configured with multiple network interfaces and is connected to multiple switches. The network administrator troubleshoots and verifies the following: The support team is able to connect remotely to the administration console. Rebooting the switch shows solid link and activity lights even on unused ports. Rebooting the telephone system does not bring the system back online. The console is able to connect directly to individual modules successfully. Which of the following is the most likely reason the customer lost the connection?
Show answer
Correct answer: A
How others answered
A56%
D44%
Only 56% agreed on this answer — treat it as contested rather than settled.
Explanation
When a network switch shows solid link and activity lights on all ports, including unused ones, after rebooting, it typically indicates that the switch is experiencing a broadcast storm or network loop. This screams switch failing !!!
Adapted from community discussion by 93831b0 · 2025-02-04 · 2 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
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E
ec_
2025-03-06
Selected A1 upvote
A module failed. But the console can connect directly to individual modules, which implies they're working. So D is unlikely. So the most likely answer is A. The switch failed. Even though they rebooted it, maybe the reboot didn't resolve the hardware issue, or there's a configuration problem. The solid lights on unused ports might indicate a malfunctioning switch. Since the telephone system didn't come back after reboot, and direct connections work, the problem is likely the switch handling the telephone system's traffic. The support team can access the admin console via another interface connected to a different switch, so that's why they can still connect remotely.
9
93831b0
2025-02-04
Selected A2 upvotes
When a network switch shows solid link and activity lights on all ports, including unused ones, after rebooting, it typically indicates that the switch is experiencing a broadcast storm or network loop. This screams switch failing !!!
B
blasgmz99
2025-01-30
Selected A2 upvotes
Direct connection to modules work, Link lights up on a port with no cable connection are indicative of a failing switch.
B
Big_Wes
2025-02-12
2 upvotes
True, however "Rebooting the telephone system does not restore service" meaning it is an issue with the module if the switch is back online. D. Failed Module
Question 22 of 25
While troubleshooting a VoIP handset connection, a technician's laptop is able to successfully connect to network resources using the same port. The technician needs to identify the port on the switch. Which of the following should the technician use to determine the switch and port?
Show answer
Correct answer: A
How others answered
A100%
Explanation
LLDP is the Link Layer Discovery Protocol, which is designed to discover neighboring network devices and their port details IKE is used for establishing VPN connections, not related VLAN logically separates network traffic, not related to identifying ports netstat views network connections and statistics, not port information
Adapted from community discussion by Intel_Geek · 2024-10-28 · 10 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
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I
Intel_Geek
2024-10-28
10 upvotes
LLDP is the Link Layer Discovery Protocol, which is designed to discover neighboring network devices and their port details IKE is used for establishing VPN connections, not related VLAN logically separates network traffic, not related to identifying ports netstat views network connections and statistics, not port information
N
nap61
2024-10-25
Selected A3 upvotes
The Link Layer Discovery Protocol is a vendor-neutral link layer protocol used by network devices for advertising their identity, capabilities, and neighbours on a local area network based on IEEE 802 IKE - Internet Key Exchange - Not related to Switch VLAN - Not related to identify Port in the switch netstat - Identify logical ports in the computer/laptop, not in the switch
C
chupapi_001
2024-10-26
Selected A3 upvotes
The correct answer is A: LLDP (Link Layer Discovery Protocol) LLDP is specifically designed to help network devices advertise information about themselves and discover information about directly connected neighboring devices
C
chrys
2024-11-10
1 upvote
LLDP is perfect. IP phones don't necessarily support Cisco CDP, but they DO support LLDP. And you can configure both on your switch.
Question 23 of 25
A small business is deploying new phones, and some of the phones have full HD videoconferencing features. The Chief Information Officer is concerned that the network might not be able to handle the traffic if the traffic reaches a certain threshold. Which of the following can the network engineer configure to help ease these concerns?
Show answer
Correct answer: A
How others answered
A71%
B21%
Only 71% agreed on this answer — treat it as contested rather than settled.
Explanation
A. A VLAN with 100Mbps speed limits. Explanation: Creating a VLAN specifically for the phones and configuring speed limits (such as 100Mbps) can help manage traffic and ensure that the network remains stable under high load conditions. VLANs segment traffic, which improves performance and reduces congestion by isolating specific types of traffic, such as VoIP and videoconferencing
Adapted from community discussion by HeatSquad77 · 2024-12-31 · 2 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
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K
kinkistyle
2025-01-19
Selected A3 upvotes
The question is asking how to keep the network itself running under heavy load, not how to improve VoIP performance. In that case, the correct answer is to place limits on the bandwidth which is A
H
HeatSquad77
2024-12-31
Selected A2 upvotes
A. A VLAN with 100Mbps speed limits. Explanation: Creating a VLAN specifically for the phones and configuring speed limits (such as 100Mbps) can help manage traffic and ensure that the network remains stable under high load conditions. VLANs segment traffic, which improves performance and reduces congestion by isolating specific types of traffic, such as VoIP and videoconferencing
H
Hayder81
2024-12-03
Selected A2 upvotes
When deploying HD videoconferencing phones, Quality of Service (QoS) and traffic management become essential to ensure the network can handle increased traffic without degradation. Here's why a VLAN with traffic limits is the best solution
K
KO443
2024-11-30
Selected A2 upvotes
C Creating a VLAN with speed limits helps the network engineer manage HD videoconferencing traffic effectively, addressing the concern about excessive network usage while maintaining overall network performance.
Question 24 of 25
A network administrator needs to set up a file server to allow user access. The organization uses DHCP to assign IP addresses. Which of the following is the best solution for the administrator to set up?
Show answer
Correct answer: B
How others answered
B100%
Explanation
DHCP Reservation: A DHCP reservation allows the administrator to assign a specific IP address to the file server based on its MAC address. This means that the file server will always receive the same IP address from the DHCP server, ensuring stable and predictable access for users while still utilizing DHCP for address management.
Adapted from community discussion by BobbyCruz111 · 2024-11-10 · 7 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
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B
BobbyCruz111
2024-11-10
Selected B7 upvotes
DHCP Reservation: A DHCP reservation allows the administrator to assign a specific IP address to the file server based on its MAC address. This means that the file server will always receive the same IP address from the DHCP server, ensuring stable and predictable access for users while still utilizing DHCP for address management.
C
chrys
2024-11-10
2 upvotes
DHCP reservation is perfect. That way, if you change scope options, you don't have to go manually configuring it on all your servers.
C
chupapi_001
2024-10-26
Selected B1 upvote
The correct answer is B: A reservation for the server based on the MAC address.
C
Commando9800
2025-03-25
1 upvote
B. A reservation for the server based on the MAC address A is wrong because /32 has no available host IPs C no D no
Question 25 of 25
A systems administrator is investigating why users cannot reach a Linux web server with a browser but can ping the server IP. The server is online, the web server process is running, and the link to the switch is up. Which of the following commands should the administrator run on the server first?
Show answer
Correct answer: B
How others answered
B71%
C29%
Only 71% agreed on this answer — treat it as contested rather than settled.
Explanation
The correct answer is: B. netstat Explanation: The netstat command is used to check the listening ports and active network connections on a system. Since the web server process is running and users can ping the server, the issue might be related to whether the web server is properly listening on the expected port (e.g., TCP port 80 for HTTP or TCP port 443 for HTTPS). Running netstat (or its modern replacement, ss) can quickly verify if: The web server is listening on the expected port. The service is bound to the correct IP address or network interface.
Adapted from community discussion by SuntzuLegacy · 2024-11-30 · 5 community upvotes. Third-party contribution; reviewed by our quality filter, not independently verified.
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S
SuntzuLegacy
2024-11-30
Selected B5 upvotes
The correct answer is: B. netstat Explanation: The netstat command is used to check the listening ports and active network connections on a system. Since the web server process is running and users can ping the server, the issue might be related to whether the web server is properly listening on the expected port (e.g., TCP port 80 for HTTP or TCP port 443 for HTTPS). Running netstat (or its modern replacement, ss) can quickly verify if: The web server is listening on the expected port. The service is bound to the correct IP address or network interface.
S
Samuel1822
2024-11-29
Selected B4 upvotes
The netstat command helps verify if the server is listening on the correct port (e.g., 80 or 443 for HTTP/HTTPS)
N
Nyang2
2024-12-03
Selected B3 upvotes
Check the netstat first. Even if the demon is running, there is no port mapping or correcrt port number when checking netstat. .
B
Big_Wes
2025-02-12
1 upvote
Yes, but it asks which you should do FIRST. A simple netstat could verify this rather than looking through packets. B. Netstat

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