CompTIA N10-009 Online Practice Questions and Exam Preparation

CompTIA N10-009 Online Questions & Answers

• Question 611:

  Which of the following IP address ranges is reserved for private use?

  A. 8.8.8.8
  B. 172.16.0.1
  C. 1.1.1.1
  D. 224.0.0.1
  B. 172.16.0.1

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  Explanation

  Private IP address ranges are defined by RFC 1918 and include 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. These addresses are not routable on the public internet and are used within internal networks. 172.16.0.1 falls within the private range. Addresses like 8.8.8.8 and 1.1.1.1 are public DNS servers, while 224.0.0.1 is a multicast address. Private addressing helps conserve public IP space and enhances internal network organization.

• Question 612:

  Which of the following layers of the OSI model lies between the transport layer and the network layer?

  A. Application
  B. Data link
  C. Session
  D. Presentation
  D. Presentation

• Question 613:

  A network consultant is setting up a new wireless infrastructure. The new infrastructure is primarily focused on supporting legacy equipment that does not support the newest standards.

  Which of the following frequency ranges will the consultant most likely have to support?

  A. 2.4GHz
  B. 5GHz
  C. 5.9GHz
  D. 6GHz
  A. 2.4GHz

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  Explanation

  The most likely frequency range that the network consultant will have to support is 2.4GHz. This is because the most common legacy wireless standards, 802.11b and 802.11g, use the 2.4GHz range 1. IEEE 802.11a uses 5GHz exclusively, and 5.9GHz and 6GHz are not widely used by legacy equipment. Therefore, 2.4GHz is the correct answer.

  https://www.networkcomputing.com/networking/wireless-beginners-part-1-rf-and-waves

• Question 614:

  Two network switches at different locations are connected via fiber-optic cable at a distance of 10 miles (16 km). The duplex fiber-optic patch cord between the patch panel and switch is accidentally pinched, stopping connectivity between the two switches. A network technician replaces the broken cable with a new, single-mode patch cord. However, connectivity between both switches is still down and the link lights are still off.

  Which of the following actions should the technician perform first?

  A. Replace the fiber-optic transceiver in the switch
  B. Log in to the switch to shut down and re-enable the switchport
  C. Transpose the two fiber connectors at one end of the new patch cord
  D. Swap the single-mode fiber patch cord with a multimode fiber patch cord
  C. Transpose the two fiber connectors at one end of the new patch cord

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  Explanation

  Fiber connections require Tx on one end to connect to Rx on the other end. If the patch cord is replaced and link lights remain off, the most common cause is that the connectors are reversed. Swapping (transposing) the connectors ensures proper transmit/receive alignment.

  Option A: Replacing the transceiver may eventually be necessary, but only after verifying correct connections.

  Option B: Restarting the switchport won't resolve a physical misconnection.

  Option D: Using multimode fiber would be incorrect here, as the link was designed for single-mode (10 miles/16 km requires SMF).

  References:

  Domain: Network Troubleshooting -- Fiber connectivity, Tx/Rx alignment, link light diagnostics.

• Question 615:

  HOTSPOT

  Company C is acquiring Company A and Company B. Company C needs to merge all three networks into one Class B network. Additionally, the network capacity of each company needs to grow by 20%. Company C also requires segmentation of Company A and Company B to account for unknown security vulnerabilities within each.

  

  Instructions:

  Select the correct subnet range to meet Company C's requirements.

  Company | Current number of devices | Current subnet range | New subnet range

  

  

  

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  The best-fit subnet selections are based on host growth requirements first, then segmentation.

  Company A:

  The current device count is 32. With 20% growth, this becomes approximately 39 devices.

  A /27 supports only 30 usable hosts, so it is too small.

  A /26 supports 62 usable hosts, so 192.168.10.0/26 is the correct choice.

  Company B:

  The current device count is 100. With 20% growth, this becomes 120 devices.

  The smallest correct subnet would normally be a /25 with 126 usable hosts, but that option is not available.

  From the given choices, 192.168.1.0/23 is the smallest subnet that supports more than 120 hosts.

  Company C:

  The current device count is 10,000. With 20% growth, it requires capacity for 12,000 hosts.

  A /18 provides 16,382 usable hosts, while /19 is not available and /21 or /22 are too small.

  Therefore, 10.0.0.1/18 is the correct selection.

  Note:

  The provided options do not allow all three companies to be placed within a single true Class B network.

  These answers are the best possible selections based on the available choices.

• Question 616:

  A network administrator upgraded the wireless access points and wants to implement a configuration that will give users higher speed and less channel overlap based on device compatibility.

  Which of the following will accomplish this goal?

  A. 802.1X
  B. MIMO
  C. ESSID
  D. Band steering
  D. Band steering

• Question 617:

  Which of the following authentication methods requires a user to enter a password and scan a fingerprint?

  A. Single sign-on
  B. Kerberos
  C. Multifactor
  D. Network access control
  C. Multifactor

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  Explanation

  Multifactor authentication is a method of verifying a user's identity by requiring more than one factor, such as something the user knows, something the user has, or something the user is. A password is something the user knows, and a fingerprint is something the user is. Therefore, a user who needs to enter a password and scan a fingerprint is using multifactor authentication.

• Question 618:

  A research facility is expecting to see an exponential increase in global network traffic in the near future. The offices are equipped with 2.5Gbps fiber connections from the ISP, but the facility is currently only utilizing 1Gbps connections.

  Which of the following would need to be configured in order to use the ISP's connection speed?

  A. 802.1Q tagging
  B. Network address translation
  C. Port duplex
  D. Link aggregation
  D. Link aggregation

• Question 619:

  Users are experiencing significant lag while connecting to a cloud-based application during peak hours. An examination of the network reveals that the bandwidth is being heavily utilized. Further analysis shows that only a few users are using the application at any given time.

  Which of the following is the most cost-effective solution for this issue?

  A. Limit the number of users who can access the application.
  B. Lease a Direct Connect connection to the cloud service provider.
  C. Implement QoS to prioritize application traffic.
  D. Use a CDN to service the application.
  C. Implement QoS to prioritize application traffic.

• Question 620:

  A technician replaces a workstation, but the new device cannot connect to the network.

  Which of the following is MOST likely the cause?

  A. Port security
  B. Port tagging
  C. Port aggregation
  D. Port mirroring
  A. Port security