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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 19

Question 180

A network team addresses this situation: An IPv6-only application cannot reach a legacy IPv4-only partner through direct native IPv6 routing. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Compare policy enforcement and latency for branch and roaming clients.
  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. Test name resolution and bidirectional session flows to IPv4 targets.

Explanation

Correct Answer

D:

A load balancer routes requests only to backends that satisfy its configured health checks. Verification of this result involves testing name resolution and bidirectional session flows to IPv4 targets.

Incorrect Answers

A:

Compare policy enforcement and latency for branch and roaming clients. That check cannot demonstrate traffic delivery to healthy application targets.

B:

Degrade one path and observe real-time traffic move to the healthy one. That check cannot demonstrate traffic delivery to healthy application targets.

C:

Change contractor posture and verify denied access while approved apps remain reachable. That check cannot demonstrate traffic delivery to healthy application targets.

Question 181

A network specialist investigates this evidence: An IPv6-only application cannot reach a legacy IPv4-only partner through direct native IPv6 routing. Which underlying condition BEST explains the observed failure or requirement?

  1. IPv4 and IPv6 cannot interoperate by simple routing without transition mechanisms.
  2. Security enforcement is tied to one network location.
  3. Traditional VLAN IDs do not scale adequately across the required routed fabric.
  4. The declarative source of truth lacks approved changes.

Explanation

Correct Answer

A:

IPv4 and IPv6 cannot interoperate by simple routing without transition mechanisms. Translation or parallel stacks bridge address-family incompatibility.

Incorrect Answers

B:

An HTTP 404 after a successful TCP connection indicates an application resource or path mismatch. That does not establish iPv4 and IPv6 cannot interoperate by simple routing without transition mechanisms.

C:

VLAN membership and 802.1Q tagging determine which Layer 2 broadcast domain carries each frame. That does not establish iPv4 and IPv6 cannot interoperate by simple routing without transition mechanisms.

D:

The declarative source of truth lacks approved changes. That does not establish iPv4 and IPv6 cannot interoperate by simple routing without transition mechanisms.

Question 182

A network team observes: Dozens of remote branches require individual console configuration, leading to inconsistent baseline policies. What is the MOST appropriate corrective action or technical decision?

  1. Apply resource-specific identity device posture and least-privilege policy decisions.
  2. Use authenticated zero-touch onboarding with controlled templates and device identity.
  3. Update version-controlled network automation templates and enforce drift reconciliation.
  4. Evaluate a SASE architecture combining appropriate WAN and cloud security services.

Explanation

Correct Answer

B:

Automated onboarding applies consistent reviewed configurations to new devices. Manual per-site provisioning causes drift.

Incorrect Answers

A:

Applying resource-specific identity device posture and least-privilege policy decisions would not meet the need for authenticated zero-touch onboarding with controlled templates and device identity.

C:

Updating version-controlled network automation templates and enforcing drift reconciliation would not meet the need for authenticated zero-touch onboarding with controlled templates and device identity.

D:

Evaluating a SASE architecture combining appropriate WAN and cloud security services would not meet the need for authenticated zero-touch onboarding with controlled templates and device identity.

Question 183

A network team addresses this situation: Dozens of remote branches require individual console configuration, leading to inconsistent baseline policies. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Change contractor posture and verify denied access while approved apps remain reachable.
  2. Run automated drift checks before and after a reproducible redeploy.
  3. Enroll a test device and compare its settings with the approved template.
  4. Degrade one path and observe real-time traffic move to the healthy one.

Explanation

Correct Answer

C:

Signed enrollment and configuration parity show secure provisioning.

Incorrect Answers

A:

Change contractor posture and verify denied access while approved apps remain reachable. That check cannot demonstrate enroll a test device and compare its settings with the approved template.

B:

Run automated drift checks before and after a reproducible redeploy. That check cannot demonstrate enroll a test device and compare its settings with the approved template.

D:

Degrade one path and observe real-time traffic move to the healthy one. That check cannot demonstrate enroll a test device and compare its settings with the approved template.

Question 184

A network specialist investigates this evidence: Dozens of remote branches require individual console configuration, leading to inconsistent baseline policies. Which underlying condition BEST explains the observed failure or requirement?

  1. Network presence is being treated as broad enduring trust.
  2. The declarative source of truth lacks approved changes.
  3. Traditional VLAN IDs do not scale adequately across the required routed fabric.
  4. Manual per-site provisioning causes drift.

Explanation

Correct Answer

D:

Manual per-site provisioning causes drift. Automated onboarding applies consistent reviewed configurations to new devices.

Incorrect Answers

A:

An HTTP 404 after a successful TCP connection indicates an application resource or path mismatch. That does not establish manual per-site provisioning causes drift.

B:

The declarative source of truth lacks approved changes. That does not establish manual per-site provisioning causes drift.

C:

VLAN membership and 802.1Q tagging determine which Layer 2 broadcast domain carries each frame. That does not establish manual per-site provisioning causes drift.

Question 185

A network team observes: A branch router has no route toward a single remote lab subnet and the lab prefix will remain fixed. What is the MOST appropriate corrective action or technical decision?

  1. Add a specific static route toward the reachable upstream next hop.
  2. Create correctly tagged router subinterfaces with each VLAN gateway address.
  3. Adjust intended administrative preferences or remove the unwanted static route.
  4. Use a suitable area hierarchy and ABR design for the routing domain.

Explanation

Correct Answer

A:

A fixed destination can be served by a deliberate static route. The route table lacks a valid destination prefix entry.

Incorrect Answers

B:

Creating correctly tagged router subinterfaces with each VLAN gateway address would not add a specific static route toward the reachable upstream next hop.

C:

Adjusting intended administrative preferences or remove the unwanted static route would not add a specific static route toward the reachable upstream next hop.

D:

Using a suitable area hierarchy and ABR design for the routing domain would not add a specific static route toward the reachable upstream next hop.

Question 186

A network team addresses this situation: A branch router has no route toward a single remote lab subnet and the lab prefix will remain fixed. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Ping both gateway subinterfaces and capture their VLAN tags.
  2. Show the route table and verify traffic reaches the remote prefix.
  3. Verify the selected route source and next hop after controlled policy change.
  4. Observe link-state database scope and convergence after a branch flap.

Explanation

Correct Answer

B:

Route presence and packet delivery prove forwarding.

Incorrect Answers

A:

Per-VLAN tags and gateway success demonstrate inter-VLAN routing. That check cannot demonstrate a valid Layer 3 route toward the remote subnet.

C:

IP routing depends on a route to the destination prefix and a reachable next hop. Verification of this result involves show the route table and verify traffic reaches the remote prefix.

D:

DHCP assigns client network parameters through a supported lease exchange. That check cannot demonstrate a valid Layer 3 route toward the remote subnet.

Question 187

A network team observes: A small office reaches internal subnets but cannot reach any new external destination without explicit host routes. What is the MOST appropriate corrective action or technical decision?

  1. Enforce symmetric translated session routing or supported state synchronization.
  2. Adjust intended administrative preferences or remove the unwanted static route.
  3. Add an approved 0.0.0.0/0 default route to the border gateway.
  4. Apply explicit inbound prefix and route-policy filtering on the BGP session.

Explanation

Correct Answer

C:

A default route handles destinations lacking a more specific match.

Incorrect Answers

A:

Enforcing symmetric translated session routing or supported state synchronization would not add an approved 0.0.0.0/0 default route to the border gateway.

B:

Adjusting intended administrative preferences or remove the unwanted static route would not add an approved 0.0.0.0/0 default route to the border gateway.

D:

Applying explicit inbound prefix and routing-policy filtering on the BGP session would not add an approved 0.0.0.0/0 default route to the border gateway.

Question 188

A network team addresses this situation: A small office reaches internal subnets but cannot reach any new external destination without explicit host routes. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Trace both directions and confirm state lookup on the reply firewall.
  2. Verify the selected route source and next hop after controlled policy change.
  3. Inspect accepted route entries after injecting a prohibited test prefix.
  4. Trace traffic to an unlisted external address via the border.

Explanation

Correct Answer

D:

The first routed hop confirms default forwarding.

Incorrect Answers

A:

Stateful firewalls can distinguish permitted connection initiation from return traffic. That check cannot demonstrate trace traffic to an unlisted external address via the border.

B:

IP routing depends on a route to the destination prefix and a reachable next hop. That check cannot demonstrate trace traffic to an unlisted external address via the border.

C:

Inspect accepted route entries after injecting a prohibited test prefix. That check cannot demonstrate trace traffic to an unlisted external address via the border.

Question 189

A network specialist investigates this evidence: A small office reaches internal subnets but cannot reach any new external destination without explicit host routes. Which underlying condition BEST explains the observed failure or requirement?

  1. No gateway of last resort is installed.
  2. Route source preference precedes path metric when prefixes match.
  3. The return path lacks the original translation state.
  4. The neighbor import policy accepts unwanted networks.

Explanation

Correct Answer

A:

No gateway of last resort is installed. A default route handles destinations lacking a more specific match.

Incorrect Answers

B:

Route source preference precedes path metric when prefixes match. That does not establish an authorized inter-subnet routed path.

C:

Stateful NAT requires return traffic to match its stored flow mapping. That does not establish an authorized inter-subnet routed path.

D:

The neighbor import policy accepts unwanted networks. That does not establish an authorized inter-subnet routed path.

Question 190

A network team observes: Two routers on the same Ethernet link cannot become OSPF neighbors because their area identifiers differ. What is the MOST appropriate corrective action or technical decision?

  1. Use a suitable area hierarchy and ABR design for the routing domain.
  2. Correct the OSPF area on the affected interface to match its intended neighbor.
  3. Adjust intended administrative preferences or remove the unwanted static route.
  4. Establish appropriately filtered eBGP neighbor sessions with approved prefix advertisements.

Explanation

Correct Answer

B:

OSPF neighbors require compatible area and protocol parameters. Ospf area mismatch prevents a full routing adjacency.

Incorrect Answers

A:

Using a suitable area hierarchy and ABR design for the routing domain would not correct the OSPF area on the affected interface to match its intended neighbor.

C:

Adjusting intended administrative preferences or remove the unwanted static route would not correct the OSPF area on the affected interface to match its intended neighbor.

D:

Establishing appropriately filtered eBGP neighbor sessions with approved prefix advertisements would not correct the OSPF area on the affected interface to match its intended neighbor.


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