N10-009 practice questions 21–30

1. Question 21 · 610 in bank

   A network engineer receives a vendor alert regarding a vulnerability in a router CPU. Which of the following should the engineer do to resolve the issue?

   • AUpdate the firmware.
   • BReplace the system board.
   • CPatch the OS.
   • DIsolate the system.

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   Answer: A

   Explanation

   A. Update the firmware. Explanation: A vulnerability in a router CPU is likely related to firmware or software running on the device that could be exploited by attackers. To resolve this, the network engineer should look for a firmware update from the vendor that addresses the vulnerability. Firmware updates often contain security patches or fixes for known vulnerabilities in hardware and software.

   Source: Adapted from community discussion — HeatSquad77

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2. Question 22 · 610 in bank

   Which of the following fiber connector types is the most likely to be used on a network interface card?

   • ALC
   • BSC
   • CST
   • DMPO

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   Answer: A

   Explanation

   A. LC Explanation: The LC (Lucent Connector) is the most commonly used fiber connector type on network interface cards (NICs), especially for modern high-speed networks. LC connectors are smaller in size, making them more suitable for devices like network cards and switches where space is a consideration. Additionally, LC connectors are often used in single-mode and multimode fiber connections.

   Source: Adapted from community discussion — HeatSquad77

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3. Question 23 · 610 in bank

   Which of the following connectors provides console access to a switch?

   • AST
   • BRJ45
   • CBNC
   • DSFP

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   Answer: B

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4. Question 24 · 610 in bank

   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?

   • AHosts file
   • BSelf-signed certificate
   • CNameserver record
   • DIP helper

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   Answer: A

   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.

   Source: Adapted from community discussion — chupapi_001

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5. Question 25 · 610 in bank

   Select 2

   A network administrator notices interference with industrial equipment in the 2.4GHz range. Which of the following technologies would most likely mitigate this issue? (Choose two.)

   • AMesh network
   • B5GHz frequency
   • COmnidirectional antenna
   • DNon-overlapping channel
   • ECaptive portal
   • FAd hoc network

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   Answer: BD

   Explanation

   The correct answers are: B. 5GHz frequency D. Non-overlapping channel Explanation: B. 5GHz frequency: The 5GHz frequency band is less prone to interference from industrial equipment, which often operates in the 2.4GHz range. By switching to 5GHz, you can avoid interference and improve network performance. D. Non-overlapping channel: In the 2.4GHz range, there are only three non-overlapping channels (1, 6, and 11). If the network is using overlapping channels, it can cause interference. By selecting a non-overlapping channel, the network can reduce interference and improve signal quality.

   Source: Adapted from community discussion — HeatSquad77

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6. Question 26 · 610 in bank

   Which of the following network topologies contains a direct connection between every node in the network?

   • AMesh
   • BStar
   • CHub-and-spoke
   • DPoint-to-point

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   Answer: A

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7. Question 27 · 610 in bank

   A network architect needs to create a wireless field network to provide reliable service to public safety vehicles. Which of the following types of networks is the best solution?

   • AMesh
   • BAd hoc
   • CPoint-to-point
   • DInfrastructure

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   Answer: A

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8. Question 28 · 610 in bank

   A manager is evaluating the environmental design of a data center. Which of the following setups should the manager implement if the maximum thermal dissipation is the highest concern?

   • AA blue-green
   • BA hot-cold
   • CAn east-west
   • DAn active-passive

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   Answer: B

   Explanation

   The correct terminology likely refers to hot aisle/cold aisle containment, a data center design practice where racks are arranged so that hot air (exhaust) and cold air (intake) are separated to optimize cooling efficiency and maximize thermal dissipation.

   Source: Adapted from community discussion — c7e3f8e

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9. Question 29 · 610 in bank

   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?

   • AThe web server is in a different subnet.
   • BThe router interface is a broadcast address.
   • CThe IP address space is a class A network.
   • DThe subnet is in a private address space.

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   Answer: B

   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

   Source: Adapted from community discussion — GT256

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10. Question 30 · 610 in bank

    A network administrator is notified that a user cannot access resources on the network. The network administrator checks the physical connections to the workstation labeled User 3 and sees the Ethernet is properly connected. However, the network interface’s indicator lights are not blinking on either the computer or the switch. Which of the following is the most likely cause?

    • AThe switch failed.
    • BThe default gateway is wrong.
    • CThe port is shut down.
    • DThe VLAN assignment is incorrect.

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    Answer: C

    Explanation

    C. The port is shut down. Explanation: If the Ethernet connection is physically plugged in but there are no indicator lights blinking on either the computer or the switch, it suggests that the connection is not active on the switch port. A common reason for this is that the switch port has been administratively shut down. A shut down port won't transmit or receive data, which would explain the lack of activity on the indicator lights.

    Source: Adapted from community discussion — HeatSquad77

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N10-009 practice, question 21. 610 questions available.