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Exam Code: 300-410

Exam Name Implementing Cisco Enterprise Advanced Routing and Services (ENARSI)

Certification Provider: Cisco

Corresponding Certification: CCNP Enterprise

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Cisco 300-410 Practice Test 63

Question 620

At the Elmfield engineering office, R-ELM-EDGE1 has a correct PBR route map, but client traffic entering the LAN interface still follows the normal routing table toward the Midtown engineering center. Which continuing operational control is most directly relevant to preventing this problem?

  1. Monitor BFD state and loss events without assuming the control plane is a full path health test.
  2. Inspect policy attachment and match counters after interface or traffic-source changes.
  3. Continuously test the availability of next hops referenced by routing policies.
  4. Check VRF memberships and per-VRF tables after interface provisioning.

Explanation

Correct Answer

B:

The safeguard follows the failure mechanism at the Elmfield engineering office. Inspect policy attachment and match counters after interface or traffic-source changes.

Incorrect Answers

A:

This would manage a different failure pattern. IGP hello/dead timers alone are too slow to detect the observed forwarding-path failure. It is not the most direct recurring check for policy-based routing ingress application at the Elmfield engineering office.

C:

This is useful for another concern: Continuously test the availability of next hops referenced by routing policies. It does not continuously test policy-based routing ingress application at the Elmfield engineering office.

D:

This would manage a different failure pattern. The interface was not placed in the customer VRF, so routing separation is ineffective for that link. It is not the most direct recurring check for policy-based routing ingress application at the Elmfield engineering office.

Question 621

At the Oakbridge insurance office, a PBR rule directs selected application flows to a backup gateway that has failed, even though the normal destination route remains usable. Which continuing operational control is most directly relevant to preventing this problem?

  1. Continuously test the availability of next hops referenced by routing policies.
  2. Monitor BFD state and loss events without assuming the control plane is a full path health test.
  3. Check VRF memberships and per-VRF tables after interface provisioning.
  4. Audit route leaks against the tenant isolation policy and permitted shared prefixes.

Explanation

Correct Answer

A:

At the Oakbridge insurance office, this continuing check directly limits recurrence of the observed failure. Continuously test the availability of next hops referenced by routing policies. The underlying problem is: A static policy next hop is being used without confirming that forwarding through it is possible.

Incorrect Answers

B:

This would manage a different failure pattern. IGP hello/dead timers alone are too slow to detect the observed forwarding-path failure. It is not the most direct recurring check for pbr next-hop reachability at the Oakbridge insurance office.

C:

That safeguard protects against vrf-lite interface assignment, not the concrete risk described at the Oakbridge insurance office. A static policy next hop is being used without confirming that forwarding through it is possible.

D:

This is useful for another concern: Audit route leaks against the tenant isolation policy and permitted shared prefixes. It does not continuously test pbr next-hop reachability at the Oakbridge insurance office.

Question 622

At the Aspen agricultural office, a PBR rule directs selected application flows to a backup gateway that has failed, even though the normal destination route remains usable. Which continuing operational control is most directly relevant to preventing this problem?

  1. Monitor BFD state and loss events without assuming the control plane is a full path health test.
  2. Continuously test the availability of next hops referenced by routing policies.
  3. Audit route leaks against the tenant isolation policy and permitted shared prefixes.
  4. Inspect policy attachment and match counters after interface or traffic-source changes.

Explanation

Correct Answer

B:

At the Aspen agricultural office, this continuing check directly limits recurrence of the observed failure. Continuously test the availability of next hops referenced by routing policies. The underlying problem is: A static policy next hop is being used without confirming that forwarding through it is possible.

Incorrect Answers

A:

That safeguard protects against bfd independent fast failure detection, not the concrete risk described at the Aspen agricultural office. A static policy next hop is being used without confirming that forwarding through it is possible.

C:

This would manage a different failure pattern. VRF-Lite intentionally isolates routing tables, and sharing needs a configured route exchange. It is not the most direct recurring check for pbr next-hop reachability at the Aspen agricultural office.

D:

That safeguard protects against policy-based routing ingress application, not the concrete risk described at the Aspen agricultural office. A static policy next hop is being used without confirming that forwarding through it is possible.

Question 623

At the Cedarbrook hospital, a partner-facing interface carries 10.138.0.0/16, but lookup on R-CDR-WAN1 uses the global table instead of the intended customer VRF. Which continuing operational control is most directly relevant to preventing this problem?

  1. Continuously test the availability of next hops referenced by routing policies.
  2. Inspect policy attachment and match counters after interface or traffic-source changes.
  3. Check VRF memberships and per-VRF tables after interface provisioning.
  4. Audit route leaks against the tenant isolation policy and permitted shared prefixes.

Explanation

Correct Answer

C:

At the Cedarbrook hospital, this continuing check directly limits recurrence of the observed failure. Check VRF memberships and per-VRF tables after interface provisioning. The underlying problem is: The interface was not placed in the customer VRF, so routing separation is ineffective for that link.

Incorrect Answers

A:

This would manage a different failure pattern. A static policy next hop is being used without confirming that forwarding through it is possible. It is not the most direct recurring check for vrf-lite interface assignment at the Cedarbrook hospital.

B:

That safeguard protects against policy-based routing ingress application, not the concrete risk described at the Cedarbrook hospital. The interface was not placed in the customer VRF, so routing separation is ineffective for that link.

D:

This would manage a different failure pattern. VRF-Lite intentionally isolates routing tables, and sharing needs a configured route exchange. It is not the most direct recurring check for vrf-lite interface assignment at the Cedarbrook hospital.

Question 624

At the Redwood medical campus, a partner-facing interface carries 10.21.0.0/16, but lookup on R-RED-EDGE1 uses the global table instead of the intended customer VRF. Which continuing operational control is most directly relevant to preventing this problem?

  1. Run before-and-after route-policy tests with permitted and denied prefix lengths.
  2. Validate common transit MTUs before routing maintenance windows.
  3. Monitor topology-table feasibility after bandwidth or delay changes affect route metrics.
  4. Check VRF memberships and per-VRF tables after interface provisioning.

Explanation

Correct Answer

D:

At the Redwood medical campus, this continuing check directly limits recurrence of the observed failure. Check VRF memberships and per-VRF tables after interface provisioning. The underlying problem is: The interface was not placed in the customer VRF, so routing separation is ineffective for that link.

Incorrect Answers

A:

This is useful for another concern: Run before-and-after route-policy tests with permitted and denied prefix lengths. It does not continuously test vrf-lite interface assignment at the Redwood medical campus.

B:

This would manage a different failure pattern. Incompatible interface MTU values can prevent successful OSPF database-description exchange. It is not the most direct recurring check for vrf-lite interface assignment at the Redwood medical campus.

C:

That safeguard protects against eigrp feasible successor inequality, not the concrete risk described at the Redwood medical campus. The interface was not placed in the customer VRF, so routing separation is ineffective for that link.

Question 625

At the Clearwater library district, two isolated VRFs on R-CLW-EDGE1 need access to one shared service at the West archives campus; routes exist in each VRF, but neither can reach the shared destination. Which continuing operational control is most directly relevant to preventing this problem?

  1. Check feasibility and load-sharing results after metric tuning.
  2. Audit route leaks against the tenant isolation policy and permitted shared prefixes.
  3. Monitor BFD state and loss events without assuming the control plane is a full path health test.
  4. Watch component reachability and aggregate advertisement together during topology changes.

Explanation

Correct Answer

B:

At the Clearwater library district, this continuing check directly limits recurrence of the observed failure. Audit route leaks against the tenant isolation policy and permitted shared prefixes. The underlying problem is: VRF-Lite intentionally isolates routing tables, and sharing needs a configured route exchange.

Incorrect Answers

A:

That safeguard protects against eigrp variance traffic sharing, not the concrete risk described at the Clearwater library district. VRF-Lite intentionally isolates routing tables, and sharing needs a configured route exchange.

C:

This would manage a different failure pattern. IGP hello/dead timers alone are too slow to detect the observed forwarding-path failure. It is not the most direct recurring check for vrf route leaking at the Clearwater library district.

D:

That safeguard protects against summary black hole from missing component, not the concrete risk described at the Clearwater library district. VRF-Lite intentionally isolates routing tables, and sharing needs a configured route exchange.

Question 626

At the Bayview university campus, two isolated VRFs on R-BAY-DIST1 need access to one shared service at the Albany research network; routes exist in each VRF, but neither can reach the shared destination. Which continuing operational control is most directly relevant to preventing this problem?

  1. Audit route leaks against the tenant isolation policy and permitted shared prefixes.
  2. Test NSSA external-route translation following ABR role or configuration changes.
  3. Review area-type settings across every router when changing stub or NSSA designs.
  4. Distinguish router-local weight changes from propagated BGP attributes in policy reviews.

Explanation

Correct Answer

A:

This control monitors the relevant configuration or operational behavior at the Bayview university campus. Audit route leaks against the tenant isolation policy and permitted shared prefixes. It targets the condition described in the stem.

Incorrect Answers

B:

That safeguard protects against ospf nssa external routes, not the concrete risk described at the Bayview university campus. VRF-Lite intentionally isolates routing tables, and sharing needs a configured route exchange.

C:

This is useful for another concern: Review area-type settings across every router when changing stub or NSSA designs. It does not continuously test vrf route leaking at the Bayview university campus.

D:

This would manage a different failure pattern. Cisco BGP weight affects path selection only on the local router and is not propagated to peers. It is not the most direct recurring check for vrf route leaking at the Bayview university campus.

Question 627

At the Foothill municipal site, R-FOO-DIST1 keeps an IGP neighbor for many seconds after the point-to-point transport toward the North service operations center stops forwarding data. Which continuing operational control is most directly relevant to preventing this problem?

  1. Watch component reachability and aggregate advertisement together during topology changes.
  2. Distinguish router-local weight changes from propagated BGP attributes in policy reviews.
  3. Audit route leaks against the tenant isolation policy and permitted shared prefixes.
  4. Monitor BFD state and loss events without assuming the control plane is a full path health test.

Explanation

Correct Answer

D:

At the Foothill municipal site, this continuing check directly limits recurrence of the observed failure. Monitor BFD state and loss events without assuming the control plane is a full path health test. The underlying problem is: IGP hello/dead timers alone are too slow to detect the observed forwarding-path failure.

Incorrect Answers

A:

This is useful for another concern: Watch component reachability and aggregate advertisement together during topology changes. It does not continuously test bfd independent fast failure detection at the Foothill municipal site.

B:

This would manage a different failure pattern. Cisco BGP weight affects path selection only on the local router and is not propagated to peers. It is not the most direct recurring check for bfd independent fast failure detection at the Foothill municipal site.

C:

That safeguard protects against vrf route leaking, not the concrete risk described at the Foothill municipal site. IGP hello/dead timers alone are too slow to detect the observed forwarding-path failure.

Question 628

At the Highland government office, R-HIG-RT1 keeps an IGP neighbor for many seconds after the point-to-point transport toward the Capital public records site stops forwarding data. Which continuing operational control is most directly relevant to preventing this problem?

  1. Validate virtual-link transit-area eligibility when changing OSPF area types.
  2. Monitor BFD state and loss events without assuming the control plane is a full path health test.
  3. Audit reflector client roles and BGP propagation after adding branches.
  4. Inspect redistribution metric settings and advertised routes after protocol integration.

Explanation

Correct Answer

B:

At the Highland government office, this continuing check directly limits recurrence of the observed failure. Monitor BFD state and loss events without assuming the control plane is a full path health test. The underlying problem is: IGP hello/dead timers alone are too slow to detect the observed forwarding-path failure.

Incorrect Answers

A:

That safeguard protects against ospf virtual link transit area, not the concrete risk described at the Highland government office. IGP hello/dead timers alone are too slow to detect the observed forwarding-path failure.

C:

This would manage a different failure pattern. A normal iBGP speaker does not re-advertise routes learned from one iBGP peer to another. It is not the most direct recurring check for bfd independent fast failure detection at the Highland government office.

D:

That safeguard protects against seed metric on eigrp redistribution, not the concrete risk described at the Highland government office. IGP hello/dead timers alone are too slow to detect the observed forwarding-path failure.

Question 629

At the Brookstone distribution branch, EIGRP hellos pass across the transit link, yet R-BRK-EDGE1 never forms a neighbor with R-NEW-EDGE2; the peers use different EIGRP AS numbers. Which continuing operational control is most directly relevant to preventing this problem?

  1. Audit passive-interface defaults and explicit transit exceptions after deployments.
  2. Compare AS identifiers across both ends during adjacency provisioning.
  3. Check feasibility and load-sharing results after metric tuning.
  4. Review stub declarations and query boundaries as spoke sites are added.

Explanation

Correct Answer

B:

The safeguard follows the failure mechanism at the Brookstone distribution branch. Compare AS identifiers across both ends during adjacency provisioning.

Incorrect Answers

A:

This would manage a different failure pattern. Passive-interface suppresses routing-neighbor discovery where an EIGRP adjacency is required. It is not the most direct recurring check for eigrp as mismatch at the Brookstone distribution branch.

C:

This is useful for another concern: Check feasibility and load-sharing results after metric tuning. It does not continuously test eigrp as mismatch at the Brookstone distribution branch.

D:

This would manage a different failure pattern. The leaf is participating in a query domain larger than its topology role requires. It is not the most direct recurring check for eigrp as mismatch at the Brookstone distribution branch.

Question 630

At the Silverstream data center, EIGRP hellos pass across the transit link, yet R-SIL-PE1 never forms a neighbor with R-RIV-PE2; the peers use different EIGRP AS numbers. Which continuing operational control is most directly relevant to preventing this problem?

  1. Compare AS identifiers across both ends during adjacency provisioning.
  2. Review key rotation windows and both ends of EIGRP authentication policies together.
  3. Check feasibility and load-sharing results after metric tuning.
  4. Monitor topology-table feasibility after bandwidth or delay changes affect route metrics.

Explanation

Correct Answer

A:

At the Silverstream data center, this continuing check directly limits recurrence of the observed failure. Compare AS identifiers across both ends during adjacency provisioning. The underlying problem is: EIGRP peers in different AS configurations will not establish the intended neighbor relationship.

Incorrect Answers

B:

This would manage a different failure pattern. The adjacency rejects peer packets because their authentication settings do not agree. It is not the most direct recurring check for eigrp as mismatch at the Silverstream data center.

C:

That safeguard protects against eigrp variance traffic sharing, not the concrete risk described at the Silverstream data center. EIGRP peers in different AS configurations will not establish the intended neighbor relationship.

D:

This is useful for another concern: Monitor topology-table feasibility after bandwidth or delay changes affect route metrics. It does not continuously test eigrp as mismatch at the Silverstream data center.