N10-009 practice questions 121–130

1. Question 121 · 610 in bank

   A network engineer is testing a website to ensure it is compatible with IPv6. After attempting to ping the website by its IPv6 address, the engineer determines that the DNS has not been set up properly. Which of the following should the network engineer complete to resolve this issue?

   • AEnable a PTR record.
   • BUpdate the existing TXT record.
   • CAdd a new AAA record.
   • DConfigure a secondary NS record.

   Show answer

   Answer: C

   Explanation

   What is an AAAA Record? IPv6 Address Mapping Setup The AAAA record (or quad A record) points your hostname to an IPv6 address. The record AAAA specifies IP address (IPv6) for a given host. In other words, it resolves a domain name (or points the domain name) to the correct location by means of the IPv6 address At present days, the DNS AAAA record is not as popular as the A record. Yet, its implementation is rapidly increasing as the adoption of IPv6 is expanding. The trend shows that IPv6 will become the most commonly used IP address version in the future. The AAAA record has the following look in your ClouDNS Control Panel: Host:--------------------------Type:--------------------Points to:------------------------TTL hostname.com--------AAAA-----------------ipv6:of:your:web::site----------1 Hour https://www.cloudns.net/wiki/article/11/

   Source: Adapted from community discussion — Philco

   Next question

2. Question 122 · 610 in bank

   A small coffee shop wants to set up multiple 2.4GHz wireless access points. The access points will support a large number of users, and the network technician wants to mitigate interference as much as possible. Which of the following is the number of 22MHz channels that the equipment can support?

   • A1
   • B2
   • C3
   • D4

   Show answer

   Answer: C

   Explanation

   In the 2.4GHz band, with a channel width of 22MHz, you can technically support 14 channels as defined by the IEEE 802.11 standards, but due to channel overlap, only a few channels (typically 1, 6, and 11) can be used without significant interference with each other.

   Source: Adapted from community discussion — Philco

   Next question

3. Question 123 · 610 in bank

   A company is purchasing a 40Gbps broadband connection service from an ISP. Which of the following should most likely be configured on the 10G switch to take advantage of the new service?

   • A802.11Q tagging
   • BJumbo frames
   • CHalf duplex
   • DLink aggregation

   Show answer

   Answer: D

   Explanation

   Link Aggregation is a technique used in networking to combine multiple physical network connections into a single logical link. This improves bandwidth, redundancy, and fault tolerance. It is commonly used in Ethernet networks and is also known as port bonding, trunking, or NIC teaming.

   Source: Adapted from community discussion — Abx_01

   Next question

4. Question 124 · 610 in bank

   Which of the following attacks can cause users who are attempting to access a company website to be directed to an entirely different website?

   • ADNS poisoning
   • BDenial-of-service
   • CSocial engineering
   • DARP spoofing

   Show answer

   Answer: A

   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.

   Source: Adapted from community discussion — HeatSquad77

   Next question

5. Question 125 · 610 in bank

   Select 2

   Which of the following are the main differences between ESP and AH? (Choose two.)

   • AAH provides confidentiality through the use of encryption.
   • BESP provides authentication for IP headers and their payloads.
   • CESP provides confidentiality through the use of encryption.
   • DAH provides authentication for IP headers and their payloads.
   • EAH provides data origin authorization over shared secret.
   • FESP provides data origin authorization over shared secret.

   Show answer

   Answer: CD

   Next question

6. Question 126 · 610 in bank

   An organization wants to ensure that incoming emails were sent from a trusted source. Which of the following DNS records is used to verify the source?

   • ATXT
   • BAAA
   • CCNAME
   • DMX

   Show answer

   Answer: A

   Next question

7. Question 127 · 610 in bank

   Which of the following is the most closely associated with segmenting compute resources within a single cloud account?

   • ANetwork security group
   • BIaaS
   • CVPC
   • DHybrid cloud

   Show answer

   Answer: C

   Explanation

   VPC runs on shared infrastructure just like a public cloud. However, a VPC offers a level of isolation between the cloud customers sharing resources. This layer of isolation is achieved through a private IP subnet or a virtual local area network (VLAN).

   Source: Adapted from community discussion — Philco

   Next question

8. Question 128 · 610 in bank

   Which of the following is the most likely function to be decremented when a tool is used to measure the distance between two locations on the internet?

   • AGRE
   • BTTL
   • CVPN
   • DQoS

   Show answer

   Answer: B

   Explanation

   The TTL field in the IP header is designed to prevent packets from circulating endlessly on a network. Each time a packet passes through a router (a "hop"), the router decrements the TTL value. If the TTL reaches zero, the packet is discarded, and an ICMP "Time Exceeded" message is usually sent back to the source

   Source: Adapted from community discussion — 93831b0

   Next question

9. Question 129 · 610 in bank

   A user's home mesh wireless network is experiencing latency issues. A technician has: • Performed a speed test. • Rebooted the devices. • Performed a site survey. • Performed a wireless packet capture. The technician reviews the following information:

   

   The technician notices in the packet capture that frames were retransmitted. Which of the following is the most likely cause of the user's network issue?

   • AThe SSIDs should not be the same.
   • BThe network has too much overlap.
   • CThe devices are incompatible with the mesh network.
   • DThe nodes are underpowered.

   Show answer

   Answer: B

   Explanation

   A network has too much overlap when multiple devices or access points within the same network are broadcasting on similar or identical wireless channels: Hence the 3x 11Channels

   Source: Adapted from community discussion — Philco

   Next question

10. Question 130 · 610 in bank

    A network engineer implements a 192.168.100.0/25 subnet for a building without obtaining sizing requirements. It is later determined that the building will house 700 people. Which of the following subnet masks will most efficiently support that number of people?

    • A255.255.252.0
    • B255.255.254.0
    • C255.255.255.0
    • D255.255.255.128

    Show answer

    Answer: A

    Next question

Keyboard:J Kmove between questionsA–Dselect an answerRshow or hide the answer← →change page

N10-009 practice, question 121. 610 questions available.