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Last Update: Nov 14, 2026

N10-009 Training Course: 240 Video Lectures

N10-009 PDF Study Guide: 128 Pages

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CompTIA N10-009 Practice Test 15

Question 140

A network team addresses this situation: A lab uses 198.51.100.42 on internal servers and assumes it is a private-use network. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Test uniquely translated destinations from each site and inspect routes.
  2. Check the interface configuration and send a unicast test to its assigned host.
  3. Calculate each subnet range and compare against the parent prefix.
  4. Inspect internal addressing and confirm no unintended overlap with routed WAN prefixes.

Explanation

Correct Answer

D:

Address-plan review proves private-use selection and unique allocation.

Incorrect Answers

A:

Test uniquely translated destinations from each site and inspect routes. It does not inspect internal addressing and confirm no unintended overlap with routed WAN prefixes.

B:

A real unicast address gives a valid host target. It does not inspect internal addressing and confirm no unintended overlap with routed WAN prefixes.

C:

Nonoverlapping ranges with sufficient hosts validate VLSM. It does not inspect internal addressing and confirm no unintended overlap with routed WAN prefixes.

Question 141

A network specialist investigates this evidence: A lab uses 198.51.100.42 on internal servers and assumes it is a private-use network. Which underlying condition BEST explains the observed failure or requirement?

  1. Documentation address space is not RFC1918 private allocation.
  2. Overlapping RFC1918 prefixes make remote destinations ambiguous.
  3. 224.0.0.0/4 is reserved for IPv4 multicast group addresses.
  4. Uniform small subnets cannot accommodate different host counts.

Explanation

Correct Answer

A:

Documentation address space is not RFC1918 private allocation. Private IPv4 ranges are specifically reserved under RFC1918.

Incorrect Answers

B:

Overlapping RFC1918 prefixes make remote destinations ambiguous. That does not establish documentation address space is not RFC1918 private allocation.

C:

224.0.0.0/4 is reserved for IPv4 multicast group addresses. That does not establish documentation address space is not RFC1918 private allocation.

D:

Uniform small subnets cannot accommodate different host counts. That does not establish documentation address space is not RFC1918 private allocation.

Question 142

A network team observes: A workstation repeatedly self-assigns 169.254.42.7 after an office DHCP server outage. What is the MOST appropriate corrective action or technical decision?

  1. Choose a valid host such as 192.168.40.65 within the /26.
  2. Restore DHCP path or relay rather than routing APIPA to the internet.
  3. Choose an appropriate nonoverlapping RFC1918 subnet such as 10.44.0.0/16.
  4. Allocate /25, /26 and /28 blocks largest-first with no overlap.

Explanation

Correct Answer

B:

169.254.0.0/16 link-local addresses commonly indicate DHCP acquisition failure. The endpoint did not receive a usable dhcp lease.

Incorrect Answers

A:

Choosing a valid host such as 192.168.40.65 within the /26 would not restore DHCP path or relay rather than routing APIPA to the internet.

C:

Choosing an appropriate nonoverlapping RFC1918 subnet such as 10.44.0.0/16 would not restore DHCP path or relay rather than routing APIPA to the internet.

D:

Allocate /25, /26 and /28 blocks largest-first with no overlap would not restore DHCP path or relay rather than routing APIPA to the internet.

Question 143

A network team addresses this situation: A workstation repeatedly self-assigns 169.254.42.7 after an office DHCP server outage. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Check the interface configuration and send a unicast test to its assigned host.
  2. Inspect route lookup for 10.44.8.40 and a different /16 host.
  3. Renew the DHCP lease and verify a valid scope address and gateway.
  4. Inspect internal addressing and confirm no unintended overlap with routed WAN prefixes.

Explanation

Correct Answer

C:

A proper DHCP offer displaces the link-local fallback.

Incorrect Answers

A:

A real unicast address gives a valid host target. That check cannot demonstrate an authorized inter-subnet routed path.

B:

Inspect route lookup for 10.44.8.40 and a different /16 host. That check cannot demonstrate an authorized inter-subnet routed path.

D:

Address-plan review proves private-use selection and unique allocation. That check cannot demonstrate an authorized inter-subnet routed path.

Question 144

A network specialist investigates this evidence: A workstation repeatedly self-assigns 169.254.42.7 after an office DHCP server outage. Which underlying condition BEST explains the observed failure or requirement?

  1. 224.0.0.0/4 is reserved for IPv4 multicast group addresses.
  2. 127.0.0.0/8 is local host loopback, not a routed destination.
  3. 192.168.40.64 is the network address of that /26 block.
  4. The endpoint did not receive a usable DHCP lease.

Explanation

Correct Answer

D:

The endpoint did not receive a usable DHCP lease. 169.254.0.0/16 link-local addresses commonly indicate DHCP acquisition failure.

Incorrect Answers

A:

224.0.0.0/4 is reserved for IPv4 multicast group addresses. That does not establish successful client IP addressing from the correct scope.

B:

127.0.0.0/8 is local host loopback, not a routed destination. That does not establish successful client IP addressing from the correct scope.

C:

192.168.40.64 is the network address of that /26 block. That does not establish successful client IP addressing from the correct scope.

Question 145

A network team observes: A team must allocate a subnet for 28 user devices plus a gateway from a /24 parent. What is the MOST appropriate corrective action or technical decision?

  1. Allocate a nonoverlapping /27 with 30 usable addresses.
  2. Choose a valid host such as 192.168.40.65 within the /26.
  3. Keep or correct the /24 entry if WAN B is the intended specific path.
  4. Choose a valid unicast host IP within the assigned subnet.

Explanation

Correct Answer

A:

A /27 leaves five host bits and 2 to the fifth minus 2 usable hosts. A /28 provides only 14 usable hosts and cannot meet capacity.

Incorrect Answers

B:

Choosing a valid host such as 192.168.40.65 within the /26 would not address the need for allocate a nonoverlapping /27 with 30 usable addresses.

C:

Keeping or correct the /24 entry if WAN B is the intended specific path would not address the need for allocate a nonoverlapping /27 with 30 usable addresses.

D:

Choosing a valid unicast host IP within the assigned subnet would not address the need for allocate a nonoverlapping /27 with 30 usable addresses.

Question 146

A network team addresses this situation: A team must allocate a subnet for 28 user devices plus a gateway from a /24 parent. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Calculate block boundaries and ping the assigned host address.
  2. Enumerate subnet network, usable range and broadcast with the intended host count.
  3. Renew the DHCP lease and verify a valid scope address and gateway.
  4. Test uniquely translated destinations from each site and inspect routes.

Explanation

Correct Answer

B:

Enumerate subnet network, usable range and broadcast with the intended host count.

Incorrect Answers

A:

Calculate block boundaries and ping the assigned host address. That check cannot demonstrate enumerate subnet network, usable range and broadcast with the intended host count.

C:

A proper DHCP offer displaces the link-local fallback. That check cannot demonstrate enumerate subnet network, usable range and broadcast with the intended host count.

D:

Test uniquely translated destinations from each site and inspect routes. That check cannot demonstrate enumerate subnet network, usable range and broadcast with the intended host count.

Question 147

A network specialist investigates this evidence: A team must allocate a subnet for 28 user devices plus a gateway from a /24 parent. Which underlying condition BEST explains the observed failure or requirement?

  1. 192.168.40.64 is the network address of that /26 block.
  2. Longest-prefix match selects the most specific route.
  3. A /28 provides only 14 usable hosts and cannot meet capacity.
  4. Overlapping RFC1918 prefixes make remote destinations ambiguous.

Explanation

Correct Answer

C:

A /28 provides only 14 usable hosts and cannot meet capacity. A /27 leaves five host bits and 2 to the fifth minus 2 usable hosts.

Incorrect Answers

A:

192.168.40.64 is the network address of that /26 block. That does not establish a /28 provides only 14 usable hosts and cannot meet capacity.

B:

Longest-prefix match selects the most specific route. That does not establish a /28 provides only 14 usable hosts and cannot meet capacity.

D:

Overlapping RFC1918 prefixes make remote destinations ambiguous. That does not establish a /28 provides only 14 usable hosts and cannot meet capacity.

Question 148

A network team observes: A technician gives 192.168.40.64/26 as a host gateway even though the interface rejects it. What is the MOST appropriate corrective action or technical decision?

  1. Allocate a nonoverlapping /27 with 30 usable addresses.
  2. Use the remote server's valid network address or DNS name.
  3. Renumber or implement a deliberate temporary translation plan for the overlapping networks.
  4. Choose a valid host such as 192.168.40.65 within the /26.

Explanation

Correct Answer

D:

A /26 has 64-address blocks and reserves network and broadcast. 192.168.40.64 is the network address of that /26 block.

Incorrect Answers

A:

Allocate a nonoverlapping /27 with 30 usable addresses would not meet the need for a valid host such as 192.168.40.65 within the /26.

B:

Using the remote server's valid network address or DNS name would not meet the need for a valid host such as 192.168.40.65 within the /26.

C:

Renumber or implement a deliberate temporary translation plan for the overlapping networks would not meet the need for a valid host such as 192.168.40.65 within the /26.

Question 149

A network team addresses this situation: A technician gives 192.168.40.64/26 as a host gateway even though the interface rejects it. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Calculate block boundaries and ping the assigned host address.
  2. Enumerate subnet network, usable range and broadcast with the intended host count.
  3. Capture outgoing interface traffic and verify loopback packets never leave.
  4. Inspect internal addressing and confirm no unintended overlap with routed WAN prefixes.

Explanation

Correct Answer

A:

Calculate block boundaries and ping the assigned host address.

Incorrect Answers

B:

Enumerate subnet network, usable range and broadcast with the intended host count. That check cannot demonstrate calculate block boundaries and ping the assigned host address.

C:

No external packets demonstrates the local-only address. That check cannot demonstrate calculate block boundaries and ping the assigned host address.

D:

Address-plan review proves private-use selection and unique allocation. That check cannot demonstrate calculate block boundaries and ping the assigned host address.

Question 150

A network specialist investigates this evidence: A technician gives 192.168.40.64/26 as a host gateway even though the interface rejects it. Which underlying condition BEST explains the observed failure or requirement?

  1. A /28 provides only 14 usable hosts and cannot meet capacity.
  2. 192.168.40.64 is the network address of that /26 block.
  3. 127.0.0.0/8 is local host loopback, not a routed destination.
  4. The endpoint did not receive a usable DHCP lease.

Explanation

Correct Answer

B:

192.168.40.64 is the network address of that /26 block. A /26 has 64-address blocks and reserves network and broadcast.

Incorrect Answers

A:

A /28 provides only 14 usable hosts and cannot meet capacity.

C:

127.0.0.0/8 is local host loopback, not a routed destination. That does not establish 192.168.40.64 is the network address of that /26 block.

D:

The endpoint did not receive a usable DHCP lease. 169.254.0.0/16 link-local addresses commonly indicate DHCP acquisition failure. The missing change involves 192.168.40.64 is the network address of that /26 block.


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