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Cisco 300-410 Bundle

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 66

Question 650

At the Foothill municipal site, a point-to-point circuit is modeled as broadcast on one OSPF side and point-to-point on the other, producing inconsistent neighbor behavior. Which continuing operational control is most directly relevant to preventing this problem?

  1. Test NSSA external-route translation following ABR role or configuration changes.
  2. Coordinate OSPF key rotation between both ends of an adjacency.
  3. Record intended OSPF network types for each WAN medium and verify at turn-up.
  4. Validate virtual-link transit-area eligibility when changing OSPF area types.

Explanation

Correct Answer

C:

At the Foothill municipal site, this continuing check directly limits recurrence of the observed failure. Record intended OSPF network types for each WAN medium and verify at turn-up. The underlying problem is: Different OSPF network-type expectations lead to inconsistent adjacency and DR behavior.

Incorrect Answers

A:

This would manage a different failure pattern. NSSA external routes use type-7 LSAs internally and depend on translation for normal areas. It is not the most direct recurring check for ospf dr network-type mismatch at the Foothill municipal site.

B:

That safeguard protects against ospf authentication mismatch, not the concrete risk described at the Foothill municipal site. Different OSPF network-type expectations lead to inconsistent adjacency and DR behavior.

D:

This would manage a different failure pattern. A virtual link cannot use a stub area as its transit area to repair backbone connectivity. It is not the most direct recurring check for ospf dr network-type mismatch at the Foothill municipal site.

Question 651

At the Silverstream data center, routers in an OSPF stub area disagree on stub-area capability and fail to form neighbors after R-RIV-PE2 was reconfigured. Which continuing operational control is most directly relevant to preventing this problem?

  1. Review area-type settings across every router when changing stub or NSSA designs.
  2. Record intended OSPF network types for each WAN medium and verify at turn-up.
  3. Validate virtual-link transit-area eligibility when changing OSPF area types.
  4. Check area IDs on both ends during interface and topology changes.

Explanation

Correct Answer

A:

At the Silverstream data center, this continuing check directly limits recurrence of the observed failure. Review area-type settings across every router when changing stub or NSSA designs. The underlying problem is: The OSPF Hello options differ because one router does not agree that the area is a stub.

Incorrect Answers

B:

This would manage a different failure pattern. Different OSPF network-type expectations lead to inconsistent adjacency and DR behavior. It is not the most direct recurring check for ospf stub area options mismatch at the Silverstream data center.

C:

That safeguard protects against ospf virtual link transit area, not the concrete risk described at the Silverstream data center. The OSPF Hello options differ because one router does not agree that the area is a stub.

D:

This is useful for another concern: Check area IDs on both ends during interface and topology changes. It does not continuously test ospf stub area options mismatch at the Silverstream data center.

Question 652

At the Brookstone distribution branch, routers in an OSPF stub area disagree on stub-area capability and fail to form neighbors after R-NEW-EDGE2 was reconfigured. Which continuing operational control is most directly relevant to preventing this problem?

  1. Review area-type settings across every router when changing stub or NSSA designs.
  2. Validate common transit MTUs before routing maintenance windows.
  3. Coordinate OSPF key rotation between both ends of an adjacency.
  4. Check area IDs on both ends during interface and topology changes.

Explanation

Correct Answer

A:

The safeguard follows the failure mechanism at the Brookstone distribution branch. Review area-type settings across every router when changing stub or NSSA designs.

Incorrect Answers

B:

This is useful for another concern: Validate common transit MTUs before routing maintenance windows. It does not continuously test ospf stub area options mismatch at the Brookstone distribution branch.

C:

This would manage a different failure pattern. Authentication settings on the OSPF peers no longer match, so received protocol packets are rejected. It is not the most direct recurring check for ospf stub area options mismatch at the Brookstone distribution branch.

D:

That safeguard protects against ospf area mismatch, not the concrete risk described at the Brookstone distribution branch. The OSPF Hello options differ because one router does not agree that the area is a stub.

Question 653

At the Southridge banking office, an ASBR inside an OSPF NSSA originates an external route, but the ABR is not translating the expected type-7 route for other areas. Which continuing operational control is most directly relevant to preventing this problem?

  1. Record intended OSPF network types for each WAN medium and verify at turn-up.
  2. Coordinate OSPF key rotation between both ends of an adjacency.
  3. Test NSSA external-route translation following ABR role or configuration changes.
  4. Check learned OSPF route types, not merely metric values, when investigating path choice.

Explanation

Correct Answer

C:

At the Southridge banking office, this continuing check directly limits recurrence of the observed failure. Test NSSA external-route translation following ABR role or configuration changes. The underlying problem is: NSSA external routes use type-7 LSAs internally and depend on translation for normal areas.

Incorrect Answers

A:

This would manage a different failure pattern. Different OSPF network-type expectations lead to inconsistent adjacency and DR behavior. It is not the most direct recurring check for ospf nssa external routes at the Southridge banking office.

B:

That safeguard protects against ospf authentication mismatch, not the concrete risk described at the Southridge banking office. NSSA external routes use type-7 LSAs internally and depend on translation for normal areas.

D:

This would manage a different failure pattern. OSPF prefers intra-area routes to inter-area routes for the same prefix even when cost figures differ. It is not the most direct recurring check for ospf nssa external routes at the Southridge banking office.

Question 654

At the Lakeside transit hub, an ASBR inside an OSPF NSSA originates an external route, but the ABR is not translating the expected type-7 route for other areas. Which continuing operational control is most directly relevant to preventing this problem?

  1. Review area-type settings across every router when changing stub or NSSA designs.
  2. Check area IDs on both ends during interface and topology changes.
  3. Coordinate OSPF key rotation between both ends of an adjacency.
  4. Test NSSA external-route translation following ABR role or configuration changes.

Explanation

Correct Answer

D:

At the Lakeside transit hub, this continuing check directly limits recurrence of the observed failure. Test NSSA external-route translation following ABR role or configuration changes. The underlying problem is: NSSA external routes use type-7 LSAs internally and depend on translation for normal areas.

Incorrect Answers

A:

This is useful for another concern: Review area-type settings across every router when changing stub or NSSA designs. It does not continuously test ospf nssa external routes at the Lakeside transit hub.

B:

This would manage a different failure pattern. OSPF neighbor packets describe incompatible area membership for a common link. It is not the most direct recurring check for ospf nssa external routes at the Lakeside transit hub.

C:

That safeguard protects against ospf authentication mismatch, not the concrete risk described at the Lakeside transit hub. NSSA external routes use type-7 LSAs internally and depend on translation for normal areas.

Question 655

At the Pinecrest freight terminal, an isolated OSPF area cannot reach the backbone through its intended ABR because the virtual link traverses a stub transit area. Which continuing operational control is most directly relevant to preventing this problem?

  1. Test NSSA external-route translation following ABR role or configuration changes.
  2. Validate virtual-link transit-area eligibility when changing OSPF area types.
  3. Check area IDs on both ends during interface and topology changes.
  4. Validate common transit MTUs before routing maintenance windows.

Explanation

Correct Answer

B:

At the Pinecrest freight terminal, this continuing check directly limits recurrence of the observed failure. Validate virtual-link transit-area eligibility when changing OSPF area types. The underlying problem is: A virtual link cannot use a stub area as its transit area to repair backbone connectivity.

Incorrect Answers

A:

That safeguard protects against ospf nssa external routes, not the concrete risk described at the Pinecrest freight terminal. A virtual link cannot use a stub area as its transit area to repair backbone connectivity.

C:

This would manage a different failure pattern. OSPF neighbor packets describe incompatible area membership for a common link. It is not the most direct recurring check for ospf virtual link transit area at the Pinecrest freight terminal.

D:

That safeguard protects against ospf mtu exstart, not the concrete risk described at the Pinecrest freight terminal. A virtual link cannot use a stub area as its transit area to repair backbone connectivity.

Question 656

At the Westlake utility network, an isolated OSPF area cannot reach the backbone through its intended ABR because the virtual link traverses a stub transit area. 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. Check area IDs on both ends during interface and topology changes.
  3. Coordinate OSPF key rotation between both ends of an adjacency.
  4. Check learned OSPF route types, not merely metric values, when investigating path choice.

Explanation

Correct Answer

A:

This control monitors the relevant configuration or operational behavior at the Westlake utility network. Validate virtual-link transit-area eligibility when changing OSPF area types. It targets the condition described in the stem.

Incorrect Answers

B:

That safeguard protects against ospf area mismatch, not the concrete risk described at the Westlake utility network. A virtual link cannot use a stub area as its transit area to repair backbone connectivity.

C:

This is useful for another concern: Coordinate OSPF key rotation between both ends of an adjacency. It does not continuously test ospf virtual link transit area at the Westlake utility network.

D:

This would manage a different failure pattern. OSPF prefers intra-area routes to inter-area routes for the same prefix even when cost figures differ. It is not the most direct recurring check for ospf virtual link transit area at the Westlake utility network.

Question 657

At the Bluewater clinical network, an OSPF prefix arrives as an intra-area and an inter-area path, but an engineer assumes the lower displayed metric always makes the inter-area route preferable. Which continuing operational control is most directly relevant to preventing this problem?

  1. Check area IDs on both ends during interface and topology changes.
  2. Validate common transit MTUs before routing maintenance windows.
  3. Record intended OSPF network types for each WAN medium and verify at turn-up.
  4. Check learned OSPF route types, not merely metric values, when investigating path choice.

Explanation

Correct Answer

D:

At the Bluewater clinical network, this continuing check directly limits recurrence of the observed failure. Check learned OSPF route types, not merely metric values, when investigating path choice. The underlying problem is: OSPF prefers intra-area routes to inter-area routes for the same prefix even when cost figures differ.

Incorrect Answers

A:

This is useful for another concern: Check area IDs on both ends during interface and topology changes. It does not continuously test ospf intra-area route preference at the Bluewater clinical network.

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 ospf intra-area route preference at the Bluewater clinical network.

C:

That safeguard protects against ospf dr network-type mismatch, not the concrete risk described at the Bluewater clinical network. OSPF prefers intra-area routes to inter-area routes for the same prefix even when cost figures differ.

Question 658

At the Cedarfield retail branch, an OSPF prefix arrives as an intra-area and an inter-area path, but an engineer assumes the lower displayed metric always makes the inter-area route preferable. Which continuing operational control is most directly relevant to preventing this problem?

  1. Coordinate OSPF key rotation between both ends of an adjacency.
  2. Validate common transit MTUs before routing maintenance windows.
  3. Check learned OSPF route types, not merely metric values, when investigating path choice.
  4. Review area-type settings across every router when changing stub or NSSA designs.

Explanation

Correct Answer

C:

This control monitors the relevant configuration or operational behavior at the Cedarfield retail branch. Check learned OSPF route types, not merely metric values, when investigating path choice. It targets the condition described in the stem.

Incorrect Answers

A:

That safeguard protects against ospf authentication mismatch, not the concrete risk described at the Cedarfield retail branch. OSPF prefers intra-area routes to inter-area routes for the same prefix even when cost figures differ.

B:

This is useful for another concern: Validate common transit MTUs before routing maintenance windows. It does not continuously test ospf intra-area route preference at the Cedarfield retail branch.

D:

That safeguard protects against ospf stub area options mismatch, not the concrete risk described at the Cedarfield retail branch. OSPF prefers intra-area routes to inter-area routes for the same prefix even when cost figures differ.

Question 659

At the Ironwood training campus, R-IRN-RT1 must peer by eBGP with a reachable loopback on R-CLR-RT2 multiple routed hops away; TCP never reaches Established using default TTL behavior. Which continuing operational control is most directly relevant to preventing this problem?

  1. Monitor accepted-prefix counts and prefix-filter changes per eBGP peer.
  2. Monitor the recursive peer reachability and eBGP multihop settings after path changes.
  3. Test internal BGP propagation and exit choice after modifying local-preference policies.
  4. Audit reflector client roles and BGP propagation after adding branches.

Explanation

Correct Answer

B:

The safeguard follows the failure mechanism at the Ironwood training campus. Monitor the recursive peer reachability and eBGP multihop settings after path changes.

Incorrect Answers

A:

This would manage a different failure pattern. The current inbound BGP policy fails to constrain accepted advertisements to contracted prefixes. It is not the most direct recurring check for ebgp non-direct neighbor multihop at the Ironwood training campus.

C:

This is useful for another concern: Test internal BGP propagation and exit choice after modifying local-preference policies. It does not continuously test ebgp non-direct neighbor multihop at the Ironwood training campus.

D:

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 ebgp non-direct neighbor multihop at the Ironwood training campus.

Question 660

At the Harborview media campus, R-HAR-DIST1 must peer by eBGP with a reachable loopback on R-INL-DIST2 multiple routed hops away; TCP never reaches Established using default TTL behavior. Which continuing operational control is most directly relevant to preventing this problem?

  1. Test internal BGP propagation and exit choice after modifying local-preference policies.
  2. Monitor the recursive peer reachability and eBGP multihop settings after path changes.
  3. Distinguish router-local weight changes from propagated BGP attributes in policy reviews.
  4. Audit reflector client roles and BGP propagation after adding branches.

Explanation

Correct Answer

B:

This control monitors the relevant configuration or operational behavior at the Harborview media campus. Monitor the recursive peer reachability and eBGP multihop settings after path changes. It targets the condition described in the stem.

Incorrect Answers

A:

This is useful for another concern: Test internal BGP propagation and exit choice after modifying local-preference policies. It does not continuously test ebgp non-direct neighbor multihop at the Harborview media campus.

C:

That safeguard protects against bgp cisco weight local only, not the concrete risk described at the Harborview media campus. The default eBGP directly connected peer assumptions do not support this multiple-hop session.

D:

This is useful for another concern: Audit reflector client roles and BGP propagation after adding branches. It does not continuously test ebgp non-direct neighbor multihop at the Harborview media campus.