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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 28

Question 270

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 underlying technical condition best accounts for this evidence?

  1. The current inbound BGP policy fails to constrain accepted advertisements to contracted prefixes.
  2. Cisco BGP weight affects path selection only on the local router and is not propagated to peers.
  3. The default eBGP directly connected peer assumptions do not support this multiple-hop session.
  4. BGP local preference is examined before AS-path length, and the present attributes favor the wrong exit.

Explanation

Correct Answer

A:

The current inbound BGP policy fails to constrain accepted advertisements to contracted prefixes. That explains the specific symptom at the Bayview university campus. A direct corrective action is: Attach an inbound BGP prefix filter that explicitly permits the authorized customer set and rejects the rest.

Incorrect Answers

B:

That diagnosis belongs to bgp cisco weight local only, while the observation at the Bayview university campus points to bgp inbound prefix filtering.

C:

The observation at the Bayview university campus does not point to ebgp non-direct neighbor multihop; it points to a different condition. The current inbound BGP policy fails to constrain accepted advertisements to contracted prefixes.

D:

This diagnoses a different mechanism: BGP local preference is examined before AS-path length, and the present attributes favor the wrong exit. The reported symptom at the Bayview university campus instead concerns bgp inbound prefix filtering.

Question 271

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 underlying technical condition best accounts for this evidence?

  1. The destination VRF's route-target import policy does not match the route's export community.
  2. The egress VPN label is associated with a specific VRF forwarding action, not a global-table lookup.
  3. The IGP provides IP reachability but no working LDP control-plane adjacency supplies expected label bindings.
  4. An MPLS VPN label stack may serve transport and VPN forwarding purposes at different stages.

Explanation

Correct Answer

D:

The evidence at the Foothill municipal site supports this condition: An MPLS VPN label stack may serve transport and VPN forwarding purposes at different stages. The associated fix is: Distinguish the outer label for transit forwarding from the inner VPN label used to select the egress forwarding context.

Incorrect Answers

A:

The observation at the Foothill municipal site does not point to vpnv4 route-target mismatch; it points to a different condition. An MPLS VPN label stack may serve transport and VPN forwarding purposes at different stages.

B:

This diagnoses a different mechanism: The egress VPN label is associated with a specific VRF forwarding action, not a global-table lookup. The reported symptom at the Foothill municipal site instead concerns mpls transport and service label stack.

C:

That diagnosis belongs to ldp neighbor state on the core link, while the observation at the Foothill municipal site points to mpls transport and service label stack.

Question 272

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 underlying technical condition best accounts for this evidence?

  1. An MPLS VPN label stack may serve transport and VPN forwarding purposes at different stages.
  2. An RD distinguishes overlapping VPNv4 prefixes but does not itself authorize VRF route import.
  3. An available VPNv4 route is not reaching the CE through the chosen PE–CE routing mechanism.
  4. The destination VRF's route-target import policy does not match the route's export community.

Explanation

Correct Answer

A:

This diagnosis fits the symptoms at the Highland government office. An MPLS VPN label stack may serve transport and VPN forwarding purposes at different stages. The remedial action is: Distinguish the outer label for transit forwarding from the inner VPN label used to select the egress forwarding context.

Incorrect Answers

B:

The observation at the Highland government office does not point to route distinguisher versus route target; it points to a different condition. An MPLS VPN label stack may serve transport and VPN forwarding purposes at different stages.

C:

This diagnoses a different mechanism: An available VPNv4 route is not reaching the CE through the chosen PE–CE routing mechanism. The reported symptom at the Highland government office instead concerns mpls transport and service label stack.

D:

That diagnosis belongs to vpnv4 route-target mismatch, while the observation at the Highland government office points to mpls transport and service label stack.

Question 273

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 underlying technical condition best accounts for this evidence?

  1. An MPLS VPN label stack may serve transport and VPN forwarding purposes at different stages.
  2. An IP route alone does not guarantee an MPLS label-switched path is available in the core.
  3. The destination VRF's route-target import policy does not match the route's export community.
  4. The IGP provides IP reachability but no working LDP control-plane adjacency supplies expected label bindings.

Explanation

Correct Answer

D:

The IGP provides IP reachability but no working LDP control-plane adjacency supplies expected label bindings. That explains the specific symptom at the Brookstone distribution branch. A direct corrective action is: Verify MPLS/LDP enablement and LDP adjacency on the required core-facing interfaces.

Incorrect Answers

A:

This diagnoses a different mechanism: An MPLS VPN label stack may serve transport and VPN forwarding purposes at different stages. The reported symptom at the Brookstone distribution branch instead concerns ldp neighbor state on the core link.

B:

That diagnosis belongs to mpls unlabelled core hop, while the observation at the Brookstone distribution branch points to ldp neighbor state on the core link.

C:

The observation at the Brookstone distribution branch does not point to vpnv4 route-target mismatch; it points to a different condition. The IGP provides IP reachability but no working LDP control-plane adjacency supplies expected label bindings.

Question 274

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 underlying technical condition best accounts for this evidence?

  1. The IGP provides IP reachability but no working LDP control-plane adjacency supplies expected label bindings.
  2. An MPLS VPN label stack may serve transport and VPN forwarding purposes at different stages.
  3. The egress VPN label is associated with a specific VRF forwarding action, not a global-table lookup.
  4. An RD distinguishes overlapping VPNv4 prefixes but does not itself authorize VRF route import.

Explanation

Correct Answer

A:

The evidence at the Silverstream data center supports this condition: The IGP provides IP reachability but no working LDP control-plane adjacency supplies expected label bindings. The associated fix is: Verify MPLS/LDP enablement and LDP adjacency on the required core-facing interfaces.

Incorrect Answers

B:

This diagnoses a different mechanism: An MPLS VPN label stack may serve transport and VPN forwarding purposes at different stages. The reported symptom at the Silverstream data center instead concerns ldp neighbor state on the core link.

C:

That diagnosis belongs to mpls vpn per-vrf forwarding lookup, while the observation at the Silverstream data center points to ldp neighbor state on the core link.

D:

The observation at the Silverstream data center does not point to route distinguisher versus route target; it points to a different condition. The IGP provides IP reachability but no working LDP control-plane adjacency supplies expected label bindings.

Question 275

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 underlying technical condition best accounts for this evidence?

  1. The penultimate router can remove the outer transport label as an intended MPLS behavior.
  2. An available VPNv4 route is not reaching the CE through the chosen PE–CE routing mechanism.
  3. An IP route alone does not guarantee an MPLS label-switched path is available in the core.
  4. The IGP provides IP reachability but no working LDP control-plane adjacency supplies expected label bindings.

Explanation

Correct Answer

C:

An IP route alone does not guarantee an MPLS label-switched path is available in the core. That explains the specific symptom at the Lakeside transit hub. A direct corrective action is: Restore end-to-end label distribution and forwarding for the intended remote FEC.

Incorrect Answers

A:

That diagnosis belongs to mpls penultimate-hop popping, while the observation at the Lakeside transit hub points to mpls unlabelled core hop.

B:

The observation at the Lakeside transit hub does not point to pe to ce route exchange; it points to a different condition. An IP route alone does not guarantee an MPLS label-switched path is available in the core.

D:

That diagnosis belongs to ldp neighbor state on the core link, while the observation at the Lakeside transit hub points to mpls unlabelled core hop.

Question 276

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 underlying technical condition best accounts for this evidence?

  1. An MPLS VPN label stack may serve transport and VPN forwarding purposes at different stages.
  2. An IP route alone does not guarantee an MPLS label-switched path is available in the core.
  3. The IGP provides IP reachability but no working LDP control-plane adjacency supplies expected label bindings.
  4. An RD distinguishes overlapping VPNv4 prefixes but does not itself authorize VRF route import.

Explanation

Correct Answer

B:

This diagnosis fits the symptoms at the Southridge banking office. An IP route alone does not guarantee an MPLS label-switched path is available in the core. The remedial action is: Restore end-to-end label distribution and forwarding for the intended remote FEC.

Incorrect Answers

A:

This diagnoses a different mechanism: An MPLS VPN label stack may serve transport and VPN forwarding purposes at different stages. The reported symptom at the Southridge banking office instead concerns mpls unlabelled core hop.

C:

The observation at the Southridge banking office does not point to ldp neighbor state on the core link; it points to a different condition. An IP route alone does not guarantee an MPLS label-switched path is available in the core.

D:

This diagnoses a different mechanism: An RD distinguishes overlapping VPNv4 prefixes but does not itself authorize VRF route import. The reported symptom at the Southridge banking office instead concerns mpls unlabelled core hop.

Question 277

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 underlying technical condition best accounts for this evidence?

  1. An RD distinguishes overlapping VPNv4 prefixes but does not itself authorize VRF route import.
  2. An MPLS VPN label stack may serve transport and VPN forwarding purposes at different stages.
  3. The penultimate router can remove the outer transport label as an intended MPLS behavior.
  4. The destination VRF's route-target import policy does not match the route's export community.

Explanation

Correct Answer

C:

This diagnosis fits the symptoms at the Westlake utility network. The penultimate router can remove the outer transport label as an intended MPLS behavior. The remedial action is: Recognize penultimate-hop popping and check whether the egress still receives enough information to complete forwarding.

Incorrect Answers

A:

The observation at the Westlake utility network does not point to route distinguisher versus route target; it points to a different condition. The penultimate router can remove the outer transport label as an intended MPLS behavior.

B:

This diagnoses a different mechanism: An MPLS VPN label stack may serve transport and VPN forwarding purposes at different stages. The reported symptom at the Westlake utility network instead concerns mpls penultimate-hop popping.

D:

The observation at the Westlake utility network does not point to vpnv4 route-target mismatch; it points to a different condition. The penultimate router can remove the outer transport label as an intended MPLS behavior.

Question 278

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 underlying technical condition best accounts for this evidence?

  1. The penultimate router can remove the outer transport label as an intended MPLS behavior.
  2. The destination VRF's route-target import policy does not match the route's export community.
  3. The IGP provides IP reachability but no working LDP control-plane adjacency supplies expected label bindings.
  4. The egress VPN label is associated with a specific VRF forwarding action, not a global-table lookup.

Explanation

Correct Answer

A:

This diagnosis fits the symptoms at the Pinecrest freight terminal. The penultimate router can remove the outer transport label as an intended MPLS behavior. The remedial action is: Recognize penultimate-hop popping and check whether the egress still receives enough information to complete forwarding.

Incorrect Answers

B:

The observation at the Pinecrest freight terminal does not point to vpnv4 route-target mismatch; it points to a different condition. The penultimate router can remove the outer transport label as an intended MPLS behavior.

C:

This diagnoses a different mechanism: The IGP provides IP reachability but no working LDP control-plane adjacency supplies expected label bindings. The reported symptom at the Pinecrest freight terminal instead concerns mpls penultimate-hop popping.

D:

That diagnosis belongs to mpls vpn per-vrf forwarding lookup, while the observation at the Pinecrest freight terminal points to mpls penultimate-hop popping.

Question 279

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 underlying technical condition best accounts for this evidence?

  1. An IP route alone does not guarantee an MPLS label-switched path is available in the core.
  2. An available VPNv4 route is not reaching the CE through the chosen PE–CE routing mechanism.
  3. The IGP provides IP reachability but no working LDP control-plane adjacency supplies expected label bindings.
  4. The destination VRF's route-target import policy does not match the route's export community.

Explanation

Correct Answer

D:

The destination VRF's route-target import policy does not match the route's export community. That explains the specific symptom at the Cedarfield retail branch. A direct corrective action is: Align the exporting and importing route targets for that customer VPN without admitting other tenants.

Incorrect Answers

A:

This diagnoses a different mechanism: An IP route alone does not guarantee an MPLS label-switched path is available in the core. The reported symptom at the Cedarfield retail branch instead concerns vpnv4 route-target mismatch.

B:

That diagnosis belongs to pe to ce route exchange, while the observation at the Cedarfield retail branch points to vpnv4 route-target mismatch.

C:

The observation at the Cedarfield retail branch does not point to ldp neighbor state on the core link; it points to a different condition. The destination VRF's route-target import policy does not match the route's export community.

Question 280

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 underlying technical condition best accounts for this evidence?

  1. The penultimate router can remove the outer transport label as an intended MPLS behavior.
  2. The destination VRF's route-target import policy does not match the route's export community.
  3. The egress VPN label is associated with a specific VRF forwarding action, not a global-table lookup.
  4. An MPLS VPN label stack may serve transport and VPN forwarding purposes at different stages.

Explanation

Correct Answer

B:

The destination VRF's route-target import policy does not match the route's export community. That explains the specific symptom at the Bluewater clinical network. A direct corrective action is: Align the exporting and importing route targets for that customer VPN without admitting other tenants.

Incorrect Answers

A:

The observation at the Bluewater clinical network does not point to mpls penultimate-hop popping; it points to a different condition. The destination VRF's route-target import policy does not match the route's export community.

C:

That diagnosis belongs to mpls vpn per-vrf forwarding lookup, while the observation at the Bluewater clinical network points to vpnv4 route-target mismatch.

D:

The observation at the Bluewater clinical network does not point to mpls transport and service label stack; it points to a different condition. The destination VRF's route-target import policy does not match the route's export community.