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Last Update: Nov 14, 2026

N10-009 Training Course: 240 Video Lectures

N10-009 PDF Study Guide: 128 Pages

$79.99

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CompTIA N10-009 Practice Test 17

Question 160

A network team addresses this situation: A merger connects two offices using the same 10.20.0.0/16 internal prefix, breaking route reachability across the WAN. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Inspect internal addressing and confirm no unintended overlap with routed WAN prefixes.
  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. Test uniquely translated destinations from each site and inspect routes.

Explanation

Correct Answer

D:

Test uniquely translated destinations from each site and inspect routes.

Incorrect Answers

A:

Address-plan review proves private-use selection and unique allocation. It does not test uniquely translated destinations from each site and inspect routes.

B:

Inspect route lookup for 10.44.8.40 and a different /16 host. It does not test uniquely translated destinations from each site and inspect routes.

C:

A proper DHCP offer displaces the link-local fallback. It does not test uniquely translated destinations from each site and inspect routes.

Question 161

A network specialist investigates this evidence: A merger connects two offices using the same 10.20.0.0/16 internal prefix, breaking route reachability across the WAN. Which underlying condition BEST explains the observed failure or requirement?

  1. Overlapping RFC1918 prefixes make remote destinations ambiguous.
  2. Documentation address space is not RFC1918 private allocation.
  3. Longest-prefix match selects the most specific route.
  4. 224.0.0.0/4 is reserved for IPv4 multicast group addresses.

Explanation

Correct Answer

A:

Overlapping RFC1918 prefixes make remote destinations ambiguous. Routing alone cannot distinguish identical remote address ranges.

Incorrect Answers

B:

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

C:

Longest-prefix match selects the most specific route. That does not establish overlapping RFC1918 prefixes make remote destinations ambiguous.

D:

224.0.0.0/4 is reserved for IPv4 multicast group addresses. That does not establish overlapping RFC1918 prefixes make remote destinations ambiguous.

Question 162

A network team observes: A lab tries to assign 239.1.1.1 as a unicast printer address. What is the MOST appropriate corrective action or technical decision?

  1. Choose an appropriate nonoverlapping RFC1918 subnet such as 10.44.0.0/16.
  2. Choose a valid unicast host IP within the assigned subnet.
  3. Allocate /25, /26 and /28 blocks largest-first with no overlap.
  4. Renumber or implement a deliberate temporary translation plan for the overlapping networks.

Explanation

Correct Answer

B:

Multicast destination space is not a valid individual printer host address. 224.0.0.0/4 is reserved for ipv4 multicast group addresses.

Incorrect Answers

A:

Choosing an appropriate nonoverlapping RFC1918 subnet such as 10.44.0.0/16 would not meet the need for a valid unicast host IP within the assigned subnet.

C:

Allocate /25, /26 and /28 blocks largest-first with no overlap would not meet the need for a valid unicast host IP within the assigned subnet.

D:

Renumber or implement a deliberate temporary translation plan for the overlapping networks would not meet the need for a valid unicast host IP within the assigned subnet.

Question 163

A network team addresses this situation: A lab tries to assign 239.1.1.1 as a unicast printer address. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Inspect internal addressing and confirm no unintended overlap with routed WAN prefixes.
  2. Calculate each subnet range and compare against the parent prefix.
  3. Check the interface configuration and send a unicast test to its assigned host.
  4. Renew the DHCP lease and verify a valid scope address and gateway.

Explanation

Correct Answer

C:

A real unicast address gives a valid host target.

Incorrect Answers

A:

Address-plan review proves private-use selection and unique allocation. It does not check the interface configuration and send a unicast test to its assigned host.

B:

Nonoverlapping ranges with sufficient hosts validate VLSM. It does not check the interface configuration and send a unicast test to its assigned host.

D:

A proper DHCP offer displaces the link-local fallback. It does not check the interface configuration and send a unicast test to its assigned host.

Question 164

A network specialist investigates this evidence: A lab tries to assign 239.1.1.1 as a unicast printer address. Which underlying condition BEST explains the observed failure or requirement?

  1. Documentation address space is not RFC1918 private allocation.
  2. A /28 provides only 14 usable hosts and cannot meet capacity.
  3. 127.0.0.0/8 is local host loopback, not a routed destination.
  4. 224.0.0.0/4 is reserved for IPv4 multicast group addresses.

Explanation

Correct Answer

D:

224.0.0.0/4 is reserved for IPv4 multicast group addresses. Multicast destination space is not a valid individual printer host address.

Incorrect Answers

A:

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

B:

A /28 provides only 14 usable hosts and cannot meet capacity. The missing change involves 224.0.0.0/4 is reserved for IPv4 multicast group addresses.

C:

127.0.0.0/8 is local host loopback, not a routed destination. That does not establish 224.0.0.0/4 is reserved for IPv4 multicast group addresses.

Question 165

A network team observes: A branch has MPLS and broadband links but all video traffic follows congested MPLS without policy awareness. What is the MOST appropriate corrective action or technical decision?

  1. Configure SD-WAN application-aware path selection using loss and jitter thresholds.
  2. Apply resource-specific identity device posture and least-privilege policy decisions.
  3. Evaluate a SASE architecture combining appropriate WAN and cloud security services.
  4. Use VXLAN encapsulation with VNI mappings and controlled endpoints.

Explanation

Correct Answer

A:

SD-WAN uses multiple transports based on centrally defined policy. The wan overlay does not steer flows by application health.

Incorrect Answers

B:

Applying resource-specific identity device posture and least-privilege policy decisions would not configure SD-WAN application-aware path selection using loss and jitter thresholds.

C:

Evaluating a SASE architecture combining appropriate WAN and cloud security services would not configure SD-WAN application-aware path selection using loss and jitter thresholds.

D:

Using VXLAN encapsulation with VNI mappings and controlled endpoints would not configure SD-WAN application-aware path selection using loss and jitter thresholds.

Question 166

A network team addresses this situation: A branch has MPLS and broadband links but all video traffic follows congested MPLS without policy awareness. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Trace a test frame through VTEPs and verify correct tenant VNI isolation.
  2. Degrade one path and observe real-time traffic move to the healthy one.
  3. Change contractor posture and verify denied access while approved apps remain reachable.
  4. Compare policy enforcement and latency for branch and roaming clients.

Explanation

Correct Answer

B:

Degrade one path and observe real-time traffic move to the healthy one.

Incorrect Answers

A:

Encapsulation and VNI separation validate the overlay. That check cannot demonstrate degrade one path and observe real-time traffic move to the healthy one.

C:

Change contractor posture and verify denied access while approved apps remain reachable. That check cannot demonstrate degrade one path and observe real-time traffic move to the healthy one.

D:

Compare policy enforcement and latency for branch and roaming clients. That check cannot demonstrate degrade one path and observe real-time traffic move to the healthy one.

Question 167

A network specialist investigates this evidence: A branch has MPLS and broadband links but all video traffic follows congested MPLS without policy awareness. Which underlying condition BEST explains the observed failure or requirement?

  1. Traditional VLAN IDs do not scale adequately across the required routed fabric.
  2. Network presence is being treated as broad enduring trust.
  3. The WAN overlay does not steer flows by application health.
  4. Security enforcement is tied to one network location.

Explanation

Correct Answer

C:

The WAN overlay does not steer flows by application health. SD-WAN uses multiple transports based on centrally defined policy.

Incorrect Answers

A:

VLAN membership and 802.1Q tagging determine which Layer 2 broadcast domain carries each frame. That does not establish the WAN overlay does not steer flows by application health.

B:

An HTTP 404 after a successful TCP connection indicates an application resource or path mismatch. That does not establish the WAN overlay does not steer flows by application health.

D:

An HTTP 404 after a successful TCP connection indicates an application resource or path mismatch. The missing change involves the WAN overlay does not steer flows by application health.

Question 168

A network team observes: A virtualized data center must stretch segmented Layer 2 tenant networks over routed Layer 3 underlay links. What is the MOST appropriate corrective action or technical decision?

  1. Configure SD-WAN application-aware path selection using loss and jitter thresholds.
  2. Use validated dual-stack or DNS64/NAT64 transition paths according to endpoint requirements.
  3. Apply resource-specific identity device posture and least-privilege policy decisions.
  4. Use VXLAN encapsulation with VNI mappings and controlled endpoints.

Explanation

Correct Answer

D:

VXLAN carries Layer 2 segments over an IP network overlay. Traditional vlan ids do not scale adequately across the required routed fabric.

Incorrect Answers

A:

Configuring SD-WAN application-aware path selection using loss and jitter thresholds would not meet the need for vXLAN encapsulation with VNI mappings and controlled endpoints.

B:

Traditional vlan ids do not scale adequately across the required routed fabric.

C:

Applying resource-specific identity device posture and least-privilege policy decisions would not meet the need for vXLAN encapsulation with VNI mappings and controlled endpoints.

Question 169

A network team addresses this situation: A virtualized data center must stretch segmented Layer 2 tenant networks over routed Layer 3 underlay links. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Trace a test frame through VTEPs and verify correct tenant VNI isolation.
  2. Degrade one path and observe real-time traffic move to the healthy one.
  3. Compare policy enforcement and latency for branch and roaming clients.
  4. Test name resolution and bidirectional session flows to IPv4 targets.

Explanation

Correct Answer

A:

Encapsulation and VNI separation validate the overlay.

Incorrect Answers

B:

Degrade one path and observe real-time traffic move to the healthy one. That check cannot demonstrate trace a test frame through VTEPs and verify correct tenant VNI isolation.

C:

Compare policy enforcement and latency for branch and roaming clients. That check cannot demonstrate trace a test frame through VTEPs and verify correct tenant VNI isolation.

D:

A load balancer routes requests only to backends that satisfy its configured health checks. Verification of this result involves tracing a test frame through VTEPs and verify correct tenant VNI isolation.

Question 170

A network team observes: Remote contractors on a VPN can access all internal applications after one login. What is the MOST appropriate corrective action or technical decision?

  1. Use authenticated zero-touch onboarding with controlled templates and device identity.
  2. Apply resource-specific identity device posture and least-privilege policy decisions.
  3. Evaluate a SASE architecture combining appropriate WAN and cloud security services.
  4. Configure SD-WAN application-aware path selection using loss and jitter thresholds.

Explanation

Correct Answer

B:

Zero trust evaluates each resource request under explicit policy. Network presence is being treated as broad enduring trust.

Incorrect Answers

A:

Using authenticated zero-touch onboarding with controlled templates and device identity would not apply resource-specific identity device posture and least-privilege policy decisions.

C:

Evaluating a SASE architecture combining appropriate WAN and cloud security services would not apply resource-specific identity device posture and least-privilege policy decisions.

D:

Configuring SD-WAN application-aware path selection using loss and jitter thresholds would not apply resource-specific identity device posture and least-privilege policy decisions.


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