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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 8

Question 70

At the Bayview university campus, an eBGP neighbor begins advertising unrelated routes and R-BAY-DIST1 installs more prefixes than the agreed customer set. Which operational change most directly addresses the fault described?

  1. Configure route-reflector-client relationships according to the iBGP topology design.
  2. Attach an inbound BGP prefix filter that explicitly permits the authorized customer set and rejects the rest.
  3. Apply an appropriate AS-wide policy such as local preference rather than relying on router-local weight.
  4. Configure eBGP multihop and reliable loopback reachability for the non-direct peer as appropriate.

Explanation

Correct Answer

B:

The fault at the Bayview university campus has a specific cause. The current inbound BGP policy fails to constrain accepted advertisements to contracted prefixes. Attach an inbound BGP prefix filter that explicitly permits the authorized customer set and rejects the rest. Confirm success against this result: Only the approved routes remain in the accepted BGP table after soft policy re-evaluation.

Incorrect Answers

A:

That change targets ibgp route reflection, not the reported bgp inbound prefix filtering fault at the Bayview university campus. The current inbound BGP policy fails to constrain accepted advertisements to contracted prefixes.

C:

This could help where bgp cisco weight local only is the issue, but not for the evidence reported at the Bayview university campus. The current inbound BGP policy fails to constrain accepted advertisements to contracted prefixes.

D:

That change targets ebgp non-direct neighbor multihop, not the reported bgp inbound prefix filtering fault at the Bayview university campus. The current inbound BGP policy fails to constrain accepted advertisements to contracted prefixes.

Question 71

At the Foothill municipal site, an MPLS L3VPN packet reaches the provider edge but an analyst interprets the outer transport label as the customer VPN identifier. Which operational change most directly addresses the fault described?

  1. Align the exporting and importing route targets for that customer VPN without admitting other tenants.
  2. Verify MPLS/LDP enablement and LDP adjacency on the required core-facing interfaces.
  3. Distinguish the outer label for transit forwarding from the inner VPN label used to select the egress forwarding context.
  4. Verify that the inner service label selects the intended VPN forwarding context and CE-facing path.

Explanation

Correct Answer

C:

The fault at the Foothill municipal site has a specific cause. An MPLS VPN label stack may serve transport and VPN forwarding purposes at different stages. Distinguish the outer label for transit forwarding from the inner VPN label used to select the egress forwarding context. Confirm success against this result: A controlled trace shows transport-label switching in the core and VPN-context selection at the egress PE.

Incorrect Answers

A:

This could help where vpnv4 route-target mismatch is the issue, but not for the evidence reported at the Foothill municipal site. An MPLS VPN label stack may serve transport and VPN forwarding purposes at different stages.

B:

That change targets ldp neighbor state on the core link, not the reported mpls transport and service label stack fault at the Foothill municipal site. An MPLS VPN label stack may serve transport and VPN forwarding purposes at different stages.

D:

This could help where mpls vpn per-vrf forwarding lookup is the issue, but not for the evidence reported at the Foothill municipal site. An MPLS VPN label stack may serve transport and VPN forwarding purposes at different stages.

Question 72

At the Highland government office, an MPLS L3VPN packet reaches the provider edge but an analyst interprets the outer transport label as the customer VPN identifier. Which operational change most directly addresses the fault described?

  1. Align the exporting and importing route targets for that customer VPN without admitting other tenants.
  2. Distinguish the outer label for transit forwarding from the inner VPN label used to select the egress forwarding context.
  3. Recognize penultimate-hop popping and check whether the egress still receives enough information to complete forwarding.
  4. Verify that the inner service label selects the intended VPN forwarding context and CE-facing path.

Explanation

Correct Answer

B:

Distinguish the outer label for transit forwarding from the inner VPN label used to select the egress forwarding context. That directly addresses the documented condition at the Highland government office: An MPLS VPN label stack may serve transport and VPN forwarding purposes at different stages. Confirmation should show that a controlled trace shows transport-label switching in the core and VPN-context selection at the egress PE.

Incorrect Answers

A:

This is appropriate for a different routing or network-control issue: The destination VRF's route-target import policy does not match the route's export community. The stated evidence at the Highland government office instead concerns mpls transport and service label stack.

C:

That change targets mpls penultimate-hop popping, not the reported mpls transport and service label stack fault at the Highland government office. An MPLS VPN label stack may serve transport and VPN forwarding purposes at different stages.

D:

This is appropriate for a different routing or network-control issue: The egress VPN label is associated with a specific VRF forwarding action, not a global-table lookup. The stated evidence at the Highland government office instead concerns mpls transport and service label stack.

Question 73

At the Brookstone distribution branch, IGP routes between provider edge routers are present, but LDP neighbors do not form over a required MPLS-enabled transport link. Which operational change most directly addresses the fault described?

  1. Verify MPLS/LDP enablement and LDP adjacency on the required core-facing interfaces.
  2. Configure or repair the planned PE–CE route advertisement within the customer VRF.
  3. Recognize penultimate-hop popping and check whether the egress still receives enough information to complete forwarding.
  4. Use route targets for import/export policy and reserve route distinguishers for VPNv4 prefix uniqueness.

Explanation

Correct Answer

A:

At the Brookstone distribution branch, the evidence points to a concrete mechanism rather than a generic outage. The IGP provides IP reachability but no working LDP control-plane adjacency supplies expected label bindings. Verify MPLS/LDP enablement and LDP adjacency on the required core-facing interfaces. Confirm it by checking that LDP neighbors reach operational state and usable label bindings are visible for the core FECs.

Incorrect Answers

B:

This is appropriate for a different routing or network-control issue: An available VPNv4 route is not reaching the CE through the chosen PE–CE routing mechanism. The stated evidence at the Brookstone distribution branch instead concerns ldp neighbor state on the core link.

C:

This could help where mpls penultimate-hop popping is the issue, but not for the evidence reported at the Brookstone distribution branch. The IGP provides IP reachability but no working LDP control-plane adjacency supplies expected label bindings.

D:

That change targets route distinguisher versus route target, not the reported ldp neighbor state on the core link fault at the Brookstone distribution branch. The IGP provides IP reachability but no working LDP control-plane adjacency supplies expected label bindings.

Question 74

At the Silverstream data center, IGP routes between provider edge routers are present, but LDP neighbors do not form over a required MPLS-enabled transport link. Which operational change most directly addresses the fault described?

  1. Configure or repair the planned PE–CE route advertisement within the customer VRF.
  2. Distinguish the outer label for transit forwarding from the inner VPN label used to select the egress forwarding context.
  3. Align the exporting and importing route targets for that customer VPN without admitting other tenants.
  4. Verify MPLS/LDP enablement and LDP adjacency on the required core-facing interfaces.

Explanation

Correct Answer

D:

Verify MPLS/LDP enablement and LDP adjacency on the required core-facing interfaces. That directly addresses the documented condition at the Silverstream data center: The IGP provides IP reachability but no working LDP control-plane adjacency supplies expected label bindings. Confirmation should show that LDP neighbors reach operational state and usable label bindings are visible for the core FECs.

Incorrect Answers

A:

This could help where pe to ce route exchange is the issue, but not for the evidence reported at the Silverstream data center. The IGP provides IP reachability but no working LDP control-plane adjacency supplies expected label bindings.

B:

That change targets mpls transport and service label stack, not the reported ldp neighbor state on the core link fault at the Silverstream data center. The IGP provides IP reachability but no working LDP control-plane adjacency supplies expected label bindings.

C:

This is appropriate for a different routing or network-control issue: The destination VRF's route-target import policy does not match the route's export community. The stated evidence at the Silverstream data center instead concerns ldp neighbor state on the core link.

Question 75

At the Lakeside transit hub, a provider edge can resolve the remote loopback in IP routing but no MPLS label-forwarding entry exists for that remote FEC. Which operational change most directly addresses the fault described?

  1. Verify that the inner service label selects the intended VPN forwarding context and CE-facing path.
  2. Restore end-to-end label distribution and forwarding for the intended remote FEC.
  3. Distinguish the outer label for transit forwarding from the inner VPN label used to select the egress forwarding context.
  4. Align the exporting and importing route targets for that customer VPN without admitting other tenants.

Explanation

Correct Answer

B:

Restore end-to-end label distribution and forwarding for the intended remote FEC. That directly addresses the documented condition at the Lakeside transit hub: An IP route alone does not guarantee an MPLS label-switched path is available in the core. Confirmation should show that the remote FEC has a label binding and a valid label-forwarding entry along the transport path.

Incorrect Answers

A:

This is appropriate for a different routing or network-control issue: The egress VPN label is associated with a specific VRF forwarding action, not a global-table lookup. The stated evidence at the Lakeside transit hub instead concerns mpls unlabelled core hop.

C:

That change targets mpls transport and service label stack, not the reported mpls unlabelled core hop fault at the Lakeside transit hub. An IP route alone does not guarantee an MPLS label-switched path is available in the core.

D:

This is appropriate for a different routing or network-control issue: The destination VRF's route-target import policy does not match the route's export community. The stated evidence at the Lakeside transit hub instead concerns mpls unlabelled core hop.

Question 76

At the Southridge banking office, a provider edge can resolve the remote loopback in IP routing but no MPLS label-forwarding entry exists for that remote FEC. Which operational change most directly addresses the fault described?

  1. Distinguish the outer label for transit forwarding from the inner VPN label used to select the egress forwarding context.
  2. Verify MPLS/LDP enablement and LDP adjacency on the required core-facing interfaces.
  3. Restore end-to-end label distribution and forwarding for the intended remote FEC.
  4. Verify that the inner service label selects the intended VPN forwarding context and CE-facing path.

Explanation

Correct Answer

C:

Restore end-to-end label distribution and forwarding for the intended remote FEC. That directly addresses the documented condition at the Southridge banking office: An IP route alone does not guarantee an MPLS label-switched path is available in the core. Confirmation should show that the remote FEC has a label binding and a valid label-forwarding entry along the transport path.

Incorrect Answers

A:

That change targets mpls transport and service label stack, not the reported mpls unlabelled core hop fault at the Southridge banking office. An IP route alone does not guarantee an MPLS label-switched path is available in the core.

B:

This is appropriate for a different routing or network-control issue: The IGP provides IP reachability but no working LDP control-plane adjacency supplies expected label bindings. The stated evidence at the Southridge banking office instead concerns mpls unlabelled core hop.

D:

That change targets mpls vpn per-vrf forwarding lookup, not the reported mpls unlabelled core hop fault at the Southridge banking office. An IP route alone does not guarantee an MPLS label-switched path is available in the core.

Question 77

At the Westlake utility network, a label trace shows the transit label removed one hop before the egress PE; an engineer reports a fault despite normal connectivity. Which operational change most directly addresses the fault described?

  1. Align the exporting and importing route targets for that customer VPN without admitting other tenants.
  2. Distinguish the outer label for transit forwarding from the inner VPN label used to select the egress forwarding context.
  3. Recognize penultimate-hop popping and check whether the egress still receives enough information to complete forwarding.
  4. Configure or repair the planned PE–CE route advertisement within the customer VRF.

Explanation

Correct Answer

C:

The fault at the Westlake utility network has a specific cause. The penultimate router can remove the outer transport label as an intended MPLS behavior. Recognize penultimate-hop popping and check whether the egress still receives enough information to complete forwarding. Confirm success against this result: The egress PE processes the remaining packet or service label correctly with no traffic loss.

Incorrect Answers

A:

This could help where vpnv4 route-target mismatch is the issue, but not for the evidence reported at the Westlake utility network. The penultimate router can remove the outer transport label as an intended MPLS behavior.

B:

That change targets mpls transport and service label stack, not the reported mpls penultimate-hop popping fault at the Westlake utility network. The penultimate router can remove the outer transport label as an intended MPLS behavior.

D:

This could help where pe to ce route exchange is the issue, but not for the evidence reported at the Westlake utility network. The penultimate router can remove the outer transport label as an intended MPLS behavior.

Question 78

At the Pinecrest freight terminal, a label trace shows the transit label removed one hop before the egress PE; an engineer reports a fault despite normal connectivity. Which operational change most directly addresses the fault described?

  1. Restore end-to-end label distribution and forwarding for the intended remote FEC.
  2. Verify that the inner service label selects the intended VPN forwarding context and CE-facing path.
  3. Use route targets for import/export policy and reserve route distinguishers for VPNv4 prefix uniqueness.
  4. Recognize penultimate-hop popping and check whether the egress still receives enough information to complete forwarding.

Explanation

Correct Answer

D:

The fault at the Pinecrest freight terminal has a specific cause. The penultimate router can remove the outer transport label as an intended MPLS behavior. Recognize penultimate-hop popping and check whether the egress still receives enough information to complete forwarding. Confirm success against this result: The egress PE processes the remaining packet or service label correctly with no traffic loss.

Incorrect Answers

A:

This is appropriate for a different routing or network-control issue: An IP route alone does not guarantee an MPLS label-switched path is available in the core. The stated evidence at the Pinecrest freight terminal instead concerns mpls penultimate-hop popping.

B:

This could help where mpls vpn per-vrf forwarding lookup is the issue, but not for the evidence reported at the Pinecrest freight terminal. The penultimate router can remove the outer transport label as an intended MPLS behavior.

C:

That change targets route distinguisher versus route target, not the reported mpls penultimate-hop popping fault at the Pinecrest freight terminal. The penultimate router can remove the outer transport label as an intended MPLS behavior.

Question 79

At the Cedarfield retail branch, an MP-BGP VPNv4 route arrives at a PE, but it is absent from the intended customer VRF at the Southport warehouse. Which operational change most directly addresses the fault described?

  1. Align the exporting and importing route targets for that customer VPN without admitting other tenants.
  2. Verify that the inner service label selects the intended VPN forwarding context and CE-facing path.
  3. Recognize penultimate-hop popping and check whether the egress still receives enough information to complete forwarding.
  4. Verify MPLS/LDP enablement and LDP adjacency on the required core-facing interfaces.

Explanation

Correct Answer

A:

At the Cedarfield retail branch, the evidence points to a concrete mechanism rather than a generic outage. The destination VRF's route-target import policy does not match the route's export community. Align the exporting and importing route targets for that customer VPN without admitting other tenants. Confirm it by checking that the intended VPN prefix is imported into the correct VRF and not into unrelated VRFs.

Incorrect Answers

B:

This is appropriate for a different routing or network-control issue: The egress VPN label is associated with a specific VRF forwarding action, not a global-table lookup. The stated evidence at the Cedarfield retail branch instead concerns vpnv4 route-target mismatch.

C:

This could help where mpls penultimate-hop popping is the issue, but not for the evidence reported at the Cedarfield retail branch. The destination VRF's route-target import policy does not match the route's export community.

D:

That change targets ldp neighbor state on the core link, not the reported vpnv4 route-target mismatch fault at the Cedarfield retail branch. The destination VRF's route-target import policy does not match the route's export community.

Question 80

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 operational change most directly addresses the fault described?

  1. Recognize penultimate-hop popping and check whether the egress still receives enough information to complete forwarding.
  2. Distinguish the outer label for transit forwarding from the inner VPN label used to select the egress forwarding context.
  3. Restore end-to-end label distribution and forwarding for the intended remote FEC.
  4. Align the exporting and importing route targets for that customer VPN without admitting other tenants.

Explanation

Correct Answer

D:

Align the exporting and importing route targets for that customer VPN without admitting other tenants. That directly addresses the documented condition at the Bluewater clinical network: The destination VRF's route-target import policy does not match the route's export community. Confirmation should show that the intended VPN prefix is imported into the correct VRF and not into unrelated VRFs.

Incorrect Answers

A:

This could help where mpls penultimate-hop popping is the issue, but not for the evidence reported at the Bluewater clinical network. The destination VRF's route-target import policy does not match the route's export community.

B:

That change targets mpls transport and service label stack, not the reported vpnv4 route-target mismatch fault at the Bluewater clinical network. The destination VRF's route-target import policy does not match the route's export community.

C:

This is appropriate for a different routing or network-control issue: An IP route alone does not guarantee an MPLS label-switched path is available in the core. The stated evidence at the Bluewater clinical network instead concerns vpnv4 route-target mismatch.