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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 69

Question 680

At the Bluewater clinical network, an MP-BGP VPNv4 route arrives at a PE, but it is absent from the intended customer VRF at the Central imaging hub. Which continuing operational control is most directly relevant to preventing this problem?

  1. Validate label forwarding as well as IGP routing when onboarding an MPLS PE.
  2. Audit route-target imports and exports as part of tenant isolation checks.
  3. Distinguish expected PHP behavior from missing transport label bindings during trace analysis.
  4. Review RDs and RTs for different purposes rather than treating them as interchangeable.

Explanation

Correct Answer

B:

The safeguard follows the failure mechanism at the Bluewater clinical network. Audit route-target imports and exports as part of tenant isolation checks.

Incorrect Answers

A:

This would manage a different failure pattern. An IP route alone does not guarantee an MPLS label-switched path is available in the core. It is not the most direct recurring check for vpnv4 route-target mismatch at the Bluewater clinical network.

C:

This is useful for another concern: Distinguish expected PHP behavior from missing transport label bindings during trace analysis. It does not continuously test vpnv4 route-target mismatch at the Bluewater clinical network.

D:

This would manage a different failure pattern. An RD distinguishes overlapping VPNv4 prefixes but does not itself authorize VRF route import. It is not the most direct recurring check for vpnv4 route-target mismatch at the Bluewater clinical network.

Question 681

At the Harborview media campus, a PE advertises identical customer IPv4 prefixes from separate VPNs; an engineer expects changing only the route distinguisher to control cross-VRF import. Which continuing operational control is most directly relevant to preventing this problem?

  1. Review RDs and RTs for different purposes rather than treating them as interchangeable.
  2. Audit route-target imports and exports as part of tenant isolation checks.
  3. Test PE–CE inbound and outbound advertisements for each onboarded tenant.
  4. Monitor IGP and LDP adjacency health independently on MPLS backbone links.

Explanation

Correct Answer

A:

At the Harborview media campus, this continuing check directly limits recurrence of the observed failure. Review RDs and RTs for different purposes rather than treating them as interchangeable. The underlying problem is: An RD distinguishes overlapping VPNv4 prefixes but does not itself authorize VRF route import.

Incorrect Answers

B:

This would manage a different failure pattern. The destination VRF's route-target import policy does not match the route's export community. It is not the most direct recurring check for route distinguisher versus route target at the Harborview media campus.

C:

That safeguard protects against pe to ce route exchange, not the concrete risk described at the Harborview media campus. An RD distinguishes overlapping VPNv4 prefixes but does not itself authorize VRF route import.

D:

This is useful for another concern: Monitor IGP and LDP adjacency health independently on MPLS backbone links. It does not continuously test route distinguisher versus route target at the Harborview media campus.

Question 682

At the Ironwood training campus, a PE advertises identical customer IPv4 prefixes from separate VPNs; an engineer expects changing only the route distinguisher to control cross-VRF import. Which continuing operational control is most directly relevant to preventing this problem?

  1. Check inner-label mappings against VRF ownership after PE provisioning changes.
  2. Validate label forwarding as well as IGP routing when onboarding an MPLS PE.
  3. Review RDs and RTs for different purposes rather than treating them as interchangeable.
  4. Document label-stack roles and validate both transport and service label handling after MPLS changes.

Explanation

Correct Answer

C:

This control monitors the relevant configuration or operational behavior at the Ironwood training campus. Review RDs and RTs for different purposes rather than treating them as interchangeable. It targets the condition described in the stem.

Incorrect Answers

A:

That safeguard protects against mpls vpn per-vrf forwarding lookup, not the concrete risk described at the Ironwood training campus. An RD distinguishes overlapping VPNv4 prefixes but does not itself authorize VRF route import.

B:

This is useful for another concern: Validate label forwarding as well as IGP routing when onboarding an MPLS PE. It does not continuously test route distinguisher versus route target at the Ironwood training campus.

D:

That safeguard protects against mpls transport and service label stack, not the concrete risk described at the Ironwood training campus. An RD distinguishes overlapping VPNv4 prefixes but does not itself authorize VRF route import.

Question 683

At the Hillcrest research lab, a PE has the customer's VPNv4 routes in MP-BGP but the attached CE never learns the remote site's subnet. Which continuing operational control is most directly relevant to preventing this problem?

  1. Check inner-label mappings against VRF ownership after PE provisioning changes.
  2. Test PE–CE inbound and outbound advertisements for each onboarded tenant.
  3. Monitor IGP and LDP adjacency health independently on MPLS backbone links.
  4. Distinguish expected PHP behavior from missing transport label bindings during trace analysis.

Explanation

Correct Answer

B:

The safeguard follows the failure mechanism at the Hillcrest research lab. Test PE–CE inbound and outbound advertisements for each onboarded tenant.

Incorrect Answers

A:

This would manage a different failure pattern. The egress VPN label is associated with a specific VRF forwarding action, not a global-table lookup. It is not the most direct recurring check for pe to ce route exchange at the Hillcrest research lab.

C:

This is useful for another concern: Monitor IGP and LDP adjacency health independently on MPLS backbone links. It does not continuously test pe to ce route exchange at the Hillcrest research lab.

D:

This would manage a different failure pattern. The penultimate router can remove the outer transport label as an intended MPLS behavior. It is not the most direct recurring check for pe to ce route exchange at the Hillcrest research lab.

Question 684

At the Northport logistics site, a PE has the customer's VPNv4 routes in MP-BGP but the attached CE never learns the remote site's subnet. Which continuing operational control is most directly relevant to preventing this problem?

  1. Document label-stack roles and validate both transport and service label handling after MPLS changes.
  2. Check inner-label mappings against VRF ownership after PE provisioning changes.
  3. Audit route-target imports and exports as part of tenant isolation checks.
  4. Test PE–CE inbound and outbound advertisements for each onboarded tenant.

Explanation

Correct Answer

D:

At the Northport logistics site, this continuing check directly limits recurrence of the observed failure. Test PE–CE inbound and outbound advertisements for each onboarded tenant. The underlying problem is: An available VPNv4 route is not reaching the CE through the chosen PE–CE routing mechanism.

Incorrect Answers

A:

This is useful for another concern: Document label-stack roles and validate both transport and service label handling after MPLS changes. It does not continuously test pe to ce route exchange at the Northport logistics site.

B:

This would manage a different failure pattern. The egress VPN label is associated with a specific VRF forwarding action, not a global-table lookup. It is not the most direct recurring check for pe to ce route exchange at the Northport logistics site.

C:

That safeguard protects against vpnv4 route-target mismatch, not the concrete risk described at the Northport logistics site. An available VPNv4 route is not reaching the CE through the chosen PE–CE routing mechanism.

Question 685

At the Elmfield engineering office, an egress PE receives a valid inner VPN label, but customer traffic is forwarded using the wrong route-table expectation. Which continuing operational control is most directly relevant to preventing this problem?

  1. Audit route-target imports and exports as part of tenant isolation checks.
  2. Check inner-label mappings against VRF ownership after PE provisioning changes.
  3. Validate label forwarding as well as IGP routing when onboarding an MPLS PE.
  4. Test PE–CE inbound and outbound advertisements for each onboarded tenant.

Explanation

Correct Answer

B:

At the Elmfield engineering office, this continuing check directly limits recurrence of the observed failure. Check inner-label mappings against VRF ownership after PE provisioning changes. The underlying problem is: The egress VPN label is associated with a specific VRF forwarding action, not a global-table lookup.

Incorrect Answers

A:

That safeguard protects against vpnv4 route-target mismatch, not the concrete risk described at the Elmfield engineering office. The egress VPN label is associated with a specific VRF forwarding action, not a global-table lookup.

C:

This would manage a different failure pattern. An IP route alone does not guarantee an MPLS label-switched path is available in the core. It is not the most direct recurring check for mpls vpn per-vrf forwarding lookup at the Elmfield engineering office.

D:

That safeguard protects against pe to ce route exchange, not the concrete risk described at the Elmfield engineering office. The egress VPN label is associated with a specific VRF forwarding action, not a global-table lookup.

Question 686

At the Granite manufacturing plant, an egress PE receives a valid inner VPN label, but customer traffic is forwarded using the wrong route-table expectation. Which continuing operational control is most directly relevant to preventing this problem?

  1. Validate label forwarding as well as IGP routing when onboarding an MPLS PE.
  2. Distinguish expected PHP behavior from missing transport label bindings during trace analysis.
  3. Check inner-label mappings against VRF ownership after PE provisioning changes.
  4. Audit route-target imports and exports as part of tenant isolation checks.

Explanation

Correct Answer

C:

At the Granite manufacturing plant, this continuing check directly limits recurrence of the observed failure. Check inner-label mappings against VRF ownership after PE provisioning changes. The underlying problem is: The egress VPN label is associated with a specific VRF forwarding action, not a global-table lookup.

Incorrect Answers

A:

This would manage a different failure pattern. An IP route alone does not guarantee an MPLS label-switched path is available in the core. It is not the most direct recurring check for mpls vpn per-vrf forwarding lookup at the Granite manufacturing plant.

B:

That safeguard protects against mpls penultimate-hop popping, not the concrete risk described at the Granite manufacturing plant. The egress VPN label is associated with a specific VRF forwarding action, not a global-table lookup.

D:

This would manage a different failure pattern. The destination VRF's route-target import policy does not match the route's export community. It is not the most direct recurring check for mpls vpn per-vrf forwarding lookup at the Granite manufacturing plant.

Question 687

At the Aspen agricultural office, a DMVPN spoke can ping the hub's transport address but its tunnel never appears in the hub NHRP registration table. Which continuing operational control is most directly relevant to preventing this problem?

  1. Coordinate NHRP credential rotation across all members of the cloud.
  2. Validate multicast mapping whenever an IGP is added to a DMVPN cloud.
  3. Inspect NHRP redirect and shortcut state during ongoing mesh performance reviews.
  4. Monitor new spoke NHRP registrations separately from underlay ping success.

Explanation

Correct Answer

D:

At the Aspen agricultural office, this continuing check directly limits recurrence of the observed failure. Monitor new spoke NHRP registrations separately from underlay ping success. The underlying problem is: Underlay IP reachability is present, but the spoke is not registering its tunnel-to-NBMA mapping with the correct NHRP server.

Incorrect Answers

A:

This is useful for another concern: Coordinate NHRP credential rotation across all members of the cloud. It does not continuously test dmvpn spoke registration to hub at the Aspen agricultural office.

B:

This would manage a different failure pattern. Dynamic routing multicast is not properly mapped over the nonbroadcast DMVPN transport. It is not the most direct recurring check for dmvpn spoke registration to hub at the Aspen agricultural office.

C:

That safeguard protects against dmvpn phase 3 redirect and shortcut, not the concrete risk described at the Aspen agricultural office. Underlay IP reachability is present, but the spoke is not registering its tunnel-to-NBMA mapping with the correct NHRP server.

Question 688

At the Oakbridge insurance office, a DMVPN spoke can ping the hub's transport address but its tunnel never appears in the hub NHRP registration table. Which continuing operational control is most directly relevant to preventing this problem?

  1. Validate GRE tunnel mode against the intended DMVPN hub-and-spoke or dynamic-mesh topology.
  2. Validate multicast mapping whenever an IGP is added to a DMVPN cloud.
  3. Monitor new spoke NHRP registrations separately from underlay ping success.
  4. Check route next-hop attributes when tuning the hub's IGP behavior.

Explanation

Correct Answer

C:

This control monitors the relevant configuration or operational behavior at the Oakbridge insurance office. Monitor new spoke NHRP registrations separately from underlay ping success. It targets the condition described in the stem.

Incorrect Answers

A:

That safeguard protects against dmvpn mgre endpoint capability, not the concrete risk described at the Oakbridge insurance office. Underlay IP reachability is present, but the spoke is not registering its tunnel-to-NBMA mapping with the correct NHRP server.

B:

This is useful for another concern: Validate multicast mapping whenever an IGP is added to a DMVPN cloud. It does not continuously test dmvpn spoke registration to hub at the Oakbridge insurance office.

D:

That safeguard protects against dmvpn phase 2 spoke next-hop preservation, not the concrete risk described at the Oakbridge insurance office. Underlay IP reachability is present, but the spoke is not registering its tunnel-to-NBMA mapping with the correct NHRP server.

Question 689

At the Redwood medical campus, two DMVPN devices share a reachable underlay yet their NHRP configuration reports incompatible network identifiers. Which continuing operational control is most directly relevant to preventing this problem?

  1. Inspect NHRP redirect and shortcut state during ongoing mesh performance reviews.
  2. Coordinate NHRP credential rotation across all members of the cloud.
  3. Check NHRP server addressing after hub migrations.
  4. Validate NHRP network-ID consistency when adding spokes.

Explanation

Correct Answer

D:

This control monitors the relevant configuration or operational behavior at the Redwood medical campus. Validate NHRP network-ID consistency when adding spokes. It targets the condition described in the stem.

Incorrect Answers

A:

This would manage a different failure pattern. Required phase 3 NHRP redirect and shortcut exchanges are missing or not functioning. It is not the most direct recurring check for dmvpn nhrp network id mismatch at the Redwood medical campus.

B:

That safeguard protects against dmvpn nhrp authentication mismatch, not the concrete risk described at the Redwood medical campus. The NHRP tunnel interfaces are not configured to participate in the same logical NHRP network.

C:

This is useful for another concern: Check NHRP server addressing after hub migrations. It does not continuously test dmvpn nhrp network id mismatch at the Redwood medical campus.

Question 690

At the Cedarbrook hospital, two DMVPN devices share a reachable underlay yet their NHRP configuration reports incompatible network identifiers. Which continuing operational control is most directly relevant to preventing this problem?

  1. Inspect NHRP redirect and shortcut state during ongoing mesh performance reviews.
  2. Test NHRP resolution and direct tunnel setup after topology and routing changes.
  3. Validate NHRP network-ID consistency when adding spokes.
  4. Coordinate NHRP credential rotation across all members of the cloud.

Explanation

Correct Answer

C:

The safeguard follows the failure mechanism at the Cedarbrook hospital. Validate NHRP network-ID consistency when adding spokes.

Incorrect Answers

A:

This is useful for another concern: Inspect NHRP redirect and shortcut state during ongoing mesh performance reviews. It does not continuously test dmvpn nhrp network id mismatch at the Cedarbrook hospital.

B:

This would manage a different failure pattern. The origin spoke has not obtained the peer resolution needed to build an appropriate direct path. It is not the most direct recurring check for dmvpn nhrp network id mismatch at the Cedarbrook hospital.

D:

This is useful for another concern: Coordinate NHRP credential rotation across all members of the cloud. It does not continuously test dmvpn nhrp network id mismatch at the Cedarbrook hospital.