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Free CompTIA N10-009 Exam Questions (page: 19)

Page 19 of 104
PDF with 513 Questions

After running a Cat 8 cable using passthrough plugs, an electrician notices that connected cables are experiencing a lot of cross talk.
Which of the following troubleshooting steps should the electrician take first?

  1. Inspect the connectors for any wires that are touching or exposed.
  2. Restore default settings on the connected devices.
  3. Terminate the connections again.
  4. Check for radio frequency interference in the area.

Answer(s): A

Explanation:

Exposed, uneven, or touching wire pairs at the connector termination are the most common cause of excessive crosstalk when using passthrough plugs. The first step is to inspect the connector for improper wire alignment or exposed copper.



A technician is troubleshooting a user's laptop that is unable to connect to a corporate server. The technician thinks the issue pertains to routing.
Which of the following commands should the technician use to identify the issue?

  1. tcpdump
  2. dig
  3. tracert
  4. arp

Answer(s): C

Explanation:

Tracert identifies routing failures by showing each hop from the source to the destination. It reveals where packets stop or are misrouted.



After installing a series of Cat 8 keystones, a data center architect notices higher than normal interference during tests.
Which of the following steps should the architect take to troubleshoot the issue?

  1. Check to see if the end connections were wrapped in copper tape before terminating.
  2. Use passthrough modular crimping plugs instead of traditional crimping plugs.
  3. Connect the RX/TX wires to different pins.
  4. Run a speed test on a device that can only achieve 100Mbps speeds.

Answer(s): A

Explanation:

Cat 8 cabling requires proper shield continuity. Keystones must be wrapped with shielding copper tape before termination to prevent EMI leakage and interference.



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?

  1. A VLAN with 100Mbps speed limits
  2. An IP helper to direct VoIP traffic
  3. A smaller subnet mask
  4. Full duplex on all user ports

Answer(s): A

Explanation:

Applying rate limiting on a VLAN prevents VoIP/video endpoints from consuming excessive bandwidth. HD video conferencing can saturate links, so capping bandwidth ensures stability for other services.



A virtual machine has the following configuration:

IPv4 address: 169.254.10.10
Subnet mask: 255.255.0.0

The virtual machine can reach collocated systems but cannot reach external addresses on the internet.
Which of the following is most likely the root cause?

  1. The subnet mask is incorrect.
  2. The DHCP server is offline.
  3. The IP address is an RFC1918 private address.
  4. The DNS server is unreachable.

Answer(s): B

Explanation:

A 169.254.x.x APIPA address indicates DHCP failed. Without a valid DHCP lease, the VM cannot reach networks beyond the local link.



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