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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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Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) (300-410) Practice Tests

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Cisco 300-410 Practice Test 9

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.

Question 81

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 operational change most directly addresses the fault described?

  1. Restore end-to-end label distribution and forwarding for the intended remote FEC.
  2. Distinguish the outer label for transit forwarding from the inner VPN label used to select the egress forwarding context.
  3. Use route targets for import/export policy and reserve route distinguishers for VPNv4 prefix uniqueness.
  4. Configure or repair the planned PE–CE route advertisement within the customer VRF.

Explanation

Correct Answer

C:

At the Harborview media campus, the evidence points to a concrete mechanism rather than a generic outage. An RD distinguishes overlapping VPNv4 prefixes but does not itself authorize VRF route import. Use route targets for import/export policy and reserve route distinguishers for VPNv4 prefix uniqueness. Confirm it by checking that overlapping prefixes remain distinct and only VPNs with matching RT policy import them.

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 Harborview media campus instead concerns route distinguisher versus route target.

B:

This could help where mpls transport and service label stack is the issue, but not for the evidence reported at the Harborview media campus. An RD distinguishes overlapping VPNv4 prefixes but does not itself authorize VRF route import.

D:

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 Harborview media campus instead concerns route distinguisher versus route target.

Question 82

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 operational change most directly addresses the fault described?

  1. Use route targets for import/export policy and reserve route distinguishers for VPNv4 prefix uniqueness.
  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

A:

At the Ironwood training campus, the evidence points to a concrete mechanism rather than a generic outage. An RD distinguishes overlapping VPNv4 prefixes but does not itself authorize VRF route import. Use route targets for import/export policy and reserve route distinguishers for VPNv4 prefix uniqueness. Confirm it by checking that overlapping prefixes remain distinct and only VPNs with matching RT policy import them.

Incorrect Answers

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 Ironwood training campus instead concerns route distinguisher versus route target.

C:

This could help where mpls unlabelled core hop is the issue, but not for the evidence reported at the Ironwood training campus. An RD distinguishes overlapping VPNv4 prefixes but does not itself authorize VRF route import.

D:

That change targets mpls vpn per-vrf forwarding lookup, not the reported route distinguisher versus route target fault at the Ironwood training campus. An RD distinguishes overlapping VPNv4 prefixes but does not itself authorize VRF route import.

Question 83

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 operational change most directly addresses the fault described?

  1. Configure or repair the planned PE–CE route advertisement within the customer VRF.
  2. Verify MPLS/LDP enablement and LDP adjacency on the required core-facing interfaces.
  3. Align the exporting and importing route targets for that customer VPN without admitting other tenants.
  4. Restore end-to-end label distribution and forwarding for the intended remote FEC.

Explanation

Correct Answer

A:

Configure or repair the planned PE–CE route advertisement within the customer VRF. That directly addresses the documented condition at the Hillcrest research lab: An available VPNv4 route is not reaching the CE through the chosen PE–CE routing mechanism. Confirmation should show that the CE installs the permitted remote subnet with the correct next hop and VRF isolation.

Incorrect Answers

B:

That change targets ldp neighbor state on the core link, not the reported pe to ce route exchange fault at the Hillcrest research lab. An available VPNv4 route is not reaching the CE through the chosen PE–CE routing mechanism.

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 Hillcrest research lab instead concerns pe to ce route exchange.

D:

This could help where mpls unlabelled core hop is the issue, but not for the evidence reported at the Hillcrest research lab. An available VPNv4 route is not reaching the CE through the chosen PE–CE routing mechanism.

Question 84

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 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. Use route targets for import/export policy and reserve route distinguishers for VPNv4 prefix uniqueness.
  3. Verify that the inner service label selects the intended VPN forwarding context and CE-facing path.
  4. Configure or repair the planned PE–CE route advertisement within the customer VRF.

Explanation

Correct Answer

D:

The fault at the Northport logistics site has a specific cause. An available VPNv4 route is not reaching the CE through the chosen PE–CE routing mechanism. Configure or repair the planned PE–CE route advertisement within the customer VRF. Confirm success against this result: The CE installs the permitted remote subnet with the correct next hop and VRF isolation.

Incorrect Answers

A:

This is appropriate for a different routing or network-control issue: The penultimate router can remove the outer transport label as an intended MPLS behavior. The stated evidence at the Northport logistics site instead concerns pe to ce route exchange.

B:

This could help where route distinguisher versus route target is the issue, but not for the evidence reported at the Northport logistics site. An available VPNv4 route is not reaching the CE through the chosen PE–CE routing mechanism.

C:

That change targets mpls vpn per-vrf forwarding lookup, not the reported pe to ce route exchange fault at the Northport logistics site. An available VPNv4 route is not reaching the CE through the chosen PE–CE routing mechanism.

Question 85

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 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. Verify that the inner service label selects the intended VPN forwarding context and CE-facing path.
  4. Recognize penultimate-hop popping and check whether the egress still receives enough information to complete forwarding.

Explanation

Correct Answer

C:

Verify that the inner service label selects the intended VPN forwarding context and CE-facing path. That directly addresses the documented condition at the Elmfield engineering office: The egress VPN label is associated with a specific VRF forwarding action, not a global-table lookup. Confirmation should show that a labeled packet to the customer subnet exits through the correct VRF-associated interface.

Incorrect Answers

A:

That change targets pe to ce route exchange, not the reported mpls vpn per-vrf forwarding lookup fault at the Elmfield engineering office. The egress VPN label is associated with a specific VRF forwarding action, not a global-table lookup.

B:

This is appropriate for a different routing or network-control issue: An MPLS VPN label stack may serve transport and VPN forwarding purposes at different stages. The stated evidence at the Elmfield engineering office instead concerns mpls vpn per-vrf forwarding lookup.

D:

That change targets mpls penultimate-hop popping, not the reported mpls vpn per-vrf forwarding lookup fault at the Elmfield engineering office. The egress VPN label is associated with a specific VRF forwarding action, not a global-table lookup.

Question 86

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 operational change most directly addresses the fault described?

  1. Verify MPLS/LDP enablement and LDP adjacency on the required core-facing interfaces.
  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. Distinguish the outer label for transit forwarding from the inner VPN label used to select the egress forwarding context.

Explanation

Correct Answer

B:

At the Granite manufacturing plant, the evidence points to a concrete mechanism rather than a generic outage. The egress VPN label is associated with a specific VRF forwarding action, not a global-table lookup. Verify that the inner service label selects the intended VPN forwarding context and CE-facing path. Confirm it by checking that a labeled packet to the customer subnet exits through the correct VRF-associated interface.

Incorrect Answers

A:

This could help where ldp neighbor state on the core link is the issue, but not for the evidence reported at the Granite manufacturing plant. The egress VPN label is associated with a specific VRF forwarding action, not a global-table lookup.

C:

This is appropriate for a different routing or network-control issue: The penultimate router can remove the outer transport label as an intended MPLS behavior. The stated evidence at the Granite manufacturing plant instead concerns mpls vpn per-vrf forwarding lookup.

D:

This could help where mpls transport and service label stack is the issue, but not for the evidence reported at the Granite manufacturing plant. The egress VPN label is associated with a specific VRF forwarding action, not a global-table lookup.

Question 87

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 operational change most directly addresses the fault described?

  1. Use an appropriate multipoint GRE tunnel and NHRP resolution for dynamically discovered peers.
  2. Correct the spoke's configured NHRP next-hop server and registration mapping for the hub.
  3. Set matching NHRP network identifiers on tunnel interfaces participating in the same DMVPN cloud.
  4. Verify the hub's NHRP redirect behavior and spokes' shortcut processing for the phase 3 design.

Explanation

Correct Answer

B:

Correct the spoke's configured NHRP next-hop server and registration mapping for the hub. That directly addresses the documented condition 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. Confirmation should show that the hub NHRP cache shows the spoke's tunnel and public address mapping and the tunnel routing neighbor forms.

Incorrect Answers

A:

This is appropriate for a different routing or network-control issue: A fixed GRE destination prevents the tunnel from supporting arbitrary on-demand spoke destinations. The stated evidence at the Aspen agricultural office instead concerns dmvpn spoke registration to hub.

C:

That change targets dmvpn nhrp network id mismatch, not the reported dmvpn spoke registration to hub fault 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.

D:

This is appropriate for a different routing or network-control issue: Required phase 3 NHRP redirect and shortcut exchanges are missing or not functioning. The stated evidence at the Aspen agricultural office instead concerns dmvpn spoke registration to hub.

Question 88

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 operational change most directly addresses the fault described?

  1. Verify the hub's NHRP redirect behavior and spokes' shortcut processing for the phase 3 design.
  2. Provide appropriate NHRP multicast mapping or dynamic multicast handling for the hub-spoke design.
  3. Correct the spoke's configured NHRP next-hop server and registration mapping for the hub.
  4. Verify that NHRP resolves the remote spoke's NBMA address and that direct tunnels are permitted.

Explanation

Correct Answer

C:

Correct the spoke's configured NHRP next-hop server and registration mapping for the hub. That directly addresses the documented condition 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. Confirmation should show that the hub NHRP cache shows the spoke's tunnel and public address mapping and the tunnel routing neighbor forms.

Incorrect Answers

A:

That change targets dmvpn phase 3 redirect and shortcut, not the reported dmvpn spoke registration to hub fault 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 appropriate for a different routing or network-control issue: Dynamic routing multicast is not properly mapped over the nonbroadcast DMVPN transport. The stated evidence at the Oakbridge insurance office instead concerns dmvpn spoke registration to hub.

D:

That change targets dmvpn spoke-to-spoke nhrp resolution, not the reported dmvpn spoke registration to hub fault 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 89

At the Redwood medical campus, two DMVPN devices share a reachable underlay yet their NHRP configuration reports incompatible network identifiers. Which operational change most directly addresses the fault described?

  1. Align NHRP authentication credentials between the spoke and its trusted hub.
  2. Use an appropriate multipoint GRE tunnel and NHRP resolution for dynamically discovered peers.
  3. Update the spoke's NHRP NHS reference and relevant NBMA mapping to the operational hub.
  4. Set matching NHRP network identifiers on tunnel interfaces participating in the same DMVPN cloud.

Explanation

Correct Answer

D:

Set matching NHRP network identifiers on tunnel interfaces participating in the same DMVPN cloud. That directly addresses the documented condition at the Redwood medical campus: The NHRP tunnel interfaces are not configured to participate in the same logical NHRP network. Confirmation should show that NHRP registration and resolution succeed in the intended cloud without joining a separate cloud.

Incorrect Answers

A:

This could help where dmvpn nhrp authentication mismatch is the issue, but not for the evidence reported at the Redwood medical campus. The NHRP tunnel interfaces are not configured to participate in the same logical NHRP network.

B:

That change targets dmvpn mgre endpoint capability, not the reported dmvpn nhrp network id mismatch fault at the Redwood medical campus. The NHRP tunnel interfaces are not configured to participate in the same logical NHRP network.

C:

This is appropriate for a different routing or network-control issue: NHRP messages are targeted at an obsolete next-hop server address even though the underlay works. The stated evidence at the Redwood medical campus instead concerns dmvpn nhrp network id mismatch.

Question 90

At the Cedarbrook hospital, two DMVPN devices share a reachable underlay yet their NHRP configuration reports incompatible network identifiers. Which operational change most directly addresses the fault described?

  1. Set matching NHRP network identifiers on tunnel interfaces participating in the same DMVPN cloud.
  2. Correct the spoke's configured NHRP next-hop server and registration mapping for the hub.
  3. Align NHRP authentication credentials between the spoke and its trusted hub.
  4. Verify that NHRP resolves the remote spoke's NBMA address and that direct tunnels are permitted.

Explanation

Correct Answer

A:

The fault at the Cedarbrook hospital has a specific cause. The NHRP tunnel interfaces are not configured to participate in the same logical NHRP network. Set matching NHRP network identifiers on tunnel interfaces participating in the same DMVPN cloud. Confirm success against this result: NHRP registration and resolution succeed in the intended cloud without joining a separate cloud.

Incorrect Answers

B:

This could help where dmvpn spoke registration to hub is the issue, but not for the evidence reported at the Cedarbrook hospital. The NHRP tunnel interfaces are not configured to participate in the same logical NHRP network.

C:

That change targets dmvpn nhrp authentication mismatch, not the reported dmvpn nhrp network id mismatch fault at the Cedarbrook hospital. The NHRP tunnel interfaces are not configured to participate in the same logical NHRP network.

D:

This is appropriate for a different routing or network-control issue: The origin spoke has not obtained the peer resolution needed to build an appropriate direct path. The stated evidence at the Cedarbrook hospital instead concerns dmvpn nhrp network id mismatch.