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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 11

Question 100

At the Westlake utility network, spoke traffic to the Central grid operations center still traverses the hub even though the design requires direct dynamic spoke-to-spoke forwarding. Which operational change most directly addresses the fault described?

  1. Use an appropriate multipoint GRE tunnel and NHRP resolution for dynamically discovered peers.
  2. Verify that NHRP resolves the remote spoke's NBMA address and that direct tunnels are permitted.
  3. Correct the spoke's configured NHRP next-hop server and registration mapping for the hub.
  4. Verify the hub's NHRP redirect behavior and spokes' shortcut processing for the phase 3 design.

Explanation

Correct Answer

B:

The fault at the Westlake utility network has a specific cause. The origin spoke has not obtained the peer resolution needed to build an appropriate direct path. Verify that NHRP resolves the remote spoke's NBMA address and that direct tunnels are permitted. Confirm success against this result: NHRP shows the remote spoke's mapping and user traffic can traverse the direct tunnel.

Incorrect Answers

A:

That change targets dmvpn mgre endpoint capability, not the reported dmvpn spoke-to-spoke nhrp resolution fault at the Westlake utility network. The origin spoke has not obtained the peer resolution needed to build an appropriate direct path.

C:

This could help where dmvpn spoke registration to hub is the issue, but not for the evidence reported at the Westlake utility network. The origin spoke has not obtained the peer resolution needed to build an appropriate direct path.

D:

That change targets dmvpn phase 3 redirect and shortcut, not the reported dmvpn spoke-to-spoke nhrp resolution fault at the Westlake utility network. The origin spoke has not obtained the peer resolution needed to build an appropriate direct path.

Question 101

At the Bluewater clinical network, phase 2 DMVPN spokes learn remote LAN routes with the hub as next hop, forcing all spoke traffic through the hub. Which operational change most directly addresses the fault described?

  1. Update the spoke's NHRP NHS reference and relevant NBMA mapping to the operational hub.
  2. Align NHRP authentication credentials between the spoke and its trusted hub.
  3. Provide appropriate NHRP multicast mapping or dynamic multicast handling for the hub-spoke design.
  4. Preserve remote spoke tunnel next hops in routing advertisements when using phase 2 direct forwarding.

Explanation

Correct Answer

D:

Preserve remote spoke tunnel next hops in routing advertisements when using phase 2 direct forwarding. That directly addresses the documented condition at the Bluewater clinical network: Hub-side next-hop rewriting prevents the source spoke from resolving the actual destination spoke. Confirmation should show that remote branch routes retain the spoke next hop and direct NHRP resolution succeeds.

Incorrect Answers

A:

This could help where dmvpn spoke next-hop server address is the issue, but not for the evidence reported at the Bluewater clinical network. Hub-side next-hop rewriting prevents the source spoke from resolving the actual destination spoke.

B:

That change targets dmvpn nhrp authentication mismatch, not the reported dmvpn phase 2 spoke next-hop preservation fault at the Bluewater clinical network. Hub-side next-hop rewriting prevents the source spoke from resolving the actual destination spoke.

C:

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 Bluewater clinical network instead concerns dmvpn phase 2 spoke next-hop preservation.

Question 102

At the Cedarfield retail branch, phase 2 DMVPN spokes learn remote LAN routes with the hub as next hop, forcing all spoke traffic through the hub. Which operational change most directly addresses the fault described?

  1. Preserve remote spoke tunnel next hops in routing advertisements when using phase 2 direct forwarding.
  2. Align NHRP authentication credentials between the spoke and its trusted hub.
  3. Set matching NHRP network identifiers on tunnel interfaces participating in the same DMVPN cloud.
  4. Correct the spoke's configured NHRP next-hop server and registration mapping for the hub.

Explanation

Correct Answer

A:

The fault at the Cedarfield retail branch has a specific cause. Hub-side next-hop rewriting prevents the source spoke from resolving the actual destination spoke. Preserve remote spoke tunnel next hops in routing advertisements when using phase 2 direct forwarding. Confirm success against this result: Remote branch routes retain the spoke next hop and direct NHRP resolution succeeds.

Incorrect Answers

B:

This could help where dmvpn nhrp authentication mismatch is the issue, but not for the evidence reported at the Cedarfield retail branch. Hub-side next-hop rewriting prevents the source spoke from resolving the actual destination spoke.

C:

That change targets dmvpn nhrp network id mismatch, not the reported dmvpn phase 2 spoke next-hop preservation fault at the Cedarfield retail branch. Hub-side next-hop rewriting prevents the source spoke from resolving the actual destination spoke.

D:

This is appropriate for a different routing or network-control issue: Underlay IP reachability is present, but the spoke is not registering its tunnel-to-NBMA mapping with the correct NHRP server. The stated evidence at the Cedarfield retail branch instead concerns dmvpn phase 2 spoke next-hop preservation.

Question 103

At the Ironwood training campus, a phase 3 DMVPN network has working hub-and-spoke connectivity but repeated branch traffic never discovers a shorter direct path. 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. 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. Align NHRP authentication credentials between the spoke and its trusted hub.

Explanation

Correct Answer

A:

At the Ironwood training campus, the evidence points to a concrete mechanism rather than a generic outage. Required phase 3 NHRP redirect and shortcut exchanges are missing or not functioning. Verify the hub's NHRP redirect behavior and spokes' shortcut processing for the phase 3 design. Confirm it by checking that subsequent eligible traffic uses a dynamically learned shortcut instead of remaining hub-transited.

Incorrect Answers

B:

This is appropriate for a different routing or network-control issue: Underlay IP reachability is present, but the spoke is not registering its tunnel-to-NBMA mapping with the correct NHRP server. The stated evidence at the Ironwood training campus instead concerns dmvpn phase 3 redirect and shortcut.

C:

This could help where dmvpn nhrp network id mismatch is the issue, but not for the evidence reported at the Ironwood training campus. Required phase 3 NHRP redirect and shortcut exchanges are missing or not functioning.

D:

That change targets dmvpn nhrp authentication mismatch, not the reported dmvpn phase 3 redirect and shortcut fault at the Ironwood training campus. Required phase 3 NHRP redirect and shortcut exchanges are missing or not functioning.

Question 104

At the Harborview media campus, a phase 3 DMVPN network has working hub-and-spoke connectivity but repeated branch traffic never discovers a shorter direct path. 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. Verify the hub's NHRP redirect behavior and spokes' shortcut processing for the phase 3 design.
  3. Use an appropriate multipoint GRE tunnel and NHRP resolution for dynamically discovered peers.
  4. Align NHRP authentication credentials between the spoke and its trusted hub.

Explanation

Correct Answer

B:

At the Harborview media campus, the evidence points to a concrete mechanism rather than a generic outage. Required phase 3 NHRP redirect and shortcut exchanges are missing or not functioning. Verify the hub's NHRP redirect behavior and spokes' shortcut processing for the phase 3 design. Confirm it by checking that subsequent eligible traffic uses a dynamically learned shortcut instead of remaining hub-transited.

Incorrect Answers

A:

This could help where dmvpn nhrp network id mismatch is the issue, but not for the evidence reported at the Harborview media campus. Required phase 3 NHRP redirect and shortcut exchanges are missing or not functioning.

C:

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 Harborview media campus instead concerns dmvpn phase 3 redirect and shortcut.

D:

This could help where dmvpn nhrp authentication mismatch is the issue, but not for the evidence reported at the Harborview media campus. Required phase 3 NHRP redirect and shortcut exchanges are missing or not functioning.

Question 105

At the Northport logistics site, the DMVPN underlay and NHRP mappings are healthy, but IPsec negotiation fails because peers offer no matching IKE security proposal. 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. Align the mutually supported IKE policy parameters for the approved VPN peers.
  3. Preserve remote spoke tunnel next hops in routing advertisements when using phase 2 direct forwarding.
  4. Verify MPLS/LDP enablement and LDP adjacency on the required core-facing interfaces.

Explanation

Correct Answer

B:

Align the mutually supported IKE policy parameters for the approved VPN peers. That directly addresses the documented condition at the Northport logistics site: The IKE phase cannot agree on a compatible authenticated cryptographic proposal. Confirmation should show that IKE negotiates an active security association and encrypted user traffic passes.

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 ipsec ike proposal disagreement.

C:

That change targets dmvpn phase 2 spoke next-hop preservation, not the reported ipsec ike proposal disagreement fault at the Northport logistics site. The IKE phase cannot agree on a compatible authenticated cryptographic proposal.

D:

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 Northport logistics site instead concerns ipsec ike proposal disagreement.

Question 106

At the Hillcrest research lab, the DMVPN underlay and NHRP mappings are healthy, but IPsec negotiation fails because peers offer no matching IKE security proposal. Which operational change most directly addresses the fault described?

  1. Align NHRP authentication credentials between the spoke and its trusted hub.
  2. Align the mutually supported IKE policy parameters for the approved VPN peers.
  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:

The fault at the Hillcrest research lab has a specific cause. The IKE phase cannot agree on a compatible authenticated cryptographic proposal. Align the mutually supported IKE policy parameters for the approved VPN peers. Confirm success against this result: IKE negotiates an active security association and encrypted user traffic passes.

Incorrect Answers

A:

That change targets dmvpn nhrp authentication mismatch, not the reported ipsec ike proposal disagreement fault at the Hillcrest research lab. The IKE phase cannot agree on a compatible authenticated cryptographic proposal.

C:

This could help where mpls penultimate-hop popping is the issue, but not for the evidence reported at the Hillcrest research lab. The IKE phase cannot agree on a compatible authenticated cryptographic proposal.

D:

That change targets mpls transport and service label stack, not the reported ipsec ike proposal disagreement fault at the Hillcrest research lab. The IKE phase cannot agree on a compatible authenticated cryptographic proposal.

Question 107

At the Granite manufacturing plant, IKE authentication completes but the DMVPN data security association cannot establish after one device changes its IPsec proposal. 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. Configure or repair the planned PE–CE route advertisement within the customer VRF.
  3. Align NHRP authentication credentials between the spoke and its trusted hub.
  4. Align the tunnel protection profile and supported IPsec transform parameters at both peers.

Explanation

Correct Answer

D:

Align the tunnel protection profile and supported IPsec transform parameters at both peers. That directly addresses the documented condition at the Granite manufacturing plant: IKE identity authentication succeeds, but IPsec data-plane proposals are incompatible. Confirmation should show that IPsec SAs establish with the approved transform and protected tunnel traffic increments counters.

Incorrect Answers

A:

This could help where dmvpn nhrp network id mismatch is the issue, but not for the evidence reported at the Granite manufacturing plant. IKE identity authentication succeeds, but IPsec data-plane proposals are incompatible.

B:

That change targets pe to ce route exchange, not the reported ipsec profile transform mismatch fault at the Granite manufacturing plant. IKE identity authentication succeeds, but IPsec data-plane proposals are incompatible.

C:

This is appropriate for a different routing or network-control issue: NHRP registration messages are rejected because peers do not agree on their authentication secret. The stated evidence at the Granite manufacturing plant instead concerns ipsec profile transform mismatch.

Question 108

At the Elmfield engineering office, IKE authentication completes but the DMVPN data security association cannot establish after one device changes its IPsec proposal. Which operational change most directly addresses the fault described?

  1. Align the tunnel protection profile and supported IPsec transform parameters at both peers.
  2. Recognize penultimate-hop popping and check whether the egress still receives enough information to complete forwarding.
  3. Align NHRP authentication credentials between the spoke and its trusted hub.
  4. Verify the hub's NHRP redirect behavior and spokes' shortcut processing for the phase 3 design.

Explanation

Correct Answer

A:

The fault at the Elmfield engineering office has a specific cause. IKE identity authentication succeeds, but IPsec data-plane proposals are incompatible. Align the tunnel protection profile and supported IPsec transform parameters at both peers. Confirm success against this result: IPsec SAs establish with the approved transform and protected tunnel traffic increments counters.

Incorrect Answers

B:

This could help where mpls penultimate-hop popping is the issue, but not for the evidence reported at the Elmfield engineering office. IKE identity authentication succeeds, but IPsec data-plane proposals are incompatible.

C:

That change targets dmvpn nhrp authentication mismatch, not the reported ipsec profile transform mismatch fault at the Elmfield engineering office. IKE identity authentication succeeds, but IPsec data-plane proposals are incompatible.

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 Elmfield engineering office instead concerns ipsec profile transform mismatch.

Question 109

At the Oakbridge insurance office, short management packets pass through the DMVPN, but larger TCP sessions repeatedly stall after encapsulation. Which operational change most directly addresses the fault described?

  1. Use an appropriate multipoint GRE tunnel and NHRP resolution for dynamically discovered peers.
  2. Distinguish the outer label for transit forwarding from the inner VPN label used to select the egress forwarding context.
  3. Verify MPLS/LDP enablement and LDP adjacency on the required core-facing interfaces.
  4. Set appropriate tunnel MTU and TCP MSS handling based on GRE/IPsec overhead and verified PMTUD behavior.

Explanation

Correct Answer

D:

At the Oakbridge insurance office, the evidence points to a concrete mechanism rather than a generic outage. Encapsulation reduces effective payload MTU, causing large packets to fragment or be dropped. Set appropriate tunnel MTU and TCP MSS handling based on GRE/IPsec overhead and verified PMTUD behavior. Confirm it by checking that large application transfers complete without persistent fragmentation or TCP MSS black holes.

Incorrect Answers

A:

That change targets dmvpn mgre endpoint capability, not the reported gre over ipsec mtu and mss fault at the Oakbridge insurance office. Encapsulation reduces effective payload MTU, causing large packets to fragment or be dropped.

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 Oakbridge insurance office instead concerns gre over ipsec mtu and mss.

C:

This could help where ldp neighbor state on the core link is the issue, but not for the evidence reported at the Oakbridge insurance office. Encapsulation reduces effective payload MTU, causing large packets to fragment or be dropped.

Question 110

At the Aspen agricultural office, short management packets pass through the DMVPN, but larger TCP sessions repeatedly stall after encapsulation. Which operational change most directly addresses the fault described?

  1. Set appropriate tunnel MTU and TCP MSS handling based on GRE/IPsec overhead and verified PMTUD behavior.
  2. Verify that NHRP resolves the remote spoke's NBMA address and that direct tunnels are permitted.
  3. Align the mutually supported IKE policy parameters for the approved VPN peers.
  4. Restore end-to-end label distribution and forwarding for the intended remote FEC.

Explanation

Correct Answer

A:

Set appropriate tunnel MTU and TCP MSS handling based on GRE/IPsec overhead and verified PMTUD behavior. That directly addresses the documented condition at the Aspen agricultural office: Encapsulation reduces effective payload MTU, causing large packets to fragment or be dropped. Confirmation should show that large application transfers complete without persistent fragmentation or TCP MSS black holes.

Incorrect Answers

B:

That change targets dmvpn spoke-to-spoke nhrp resolution, not the reported gre over ipsec mtu and mss fault at the Aspen agricultural office. Encapsulation reduces effective payload MTU, causing large packets to fragment or be dropped.

C:

This is appropriate for a different routing or network-control issue: The IKE phase cannot agree on a compatible authenticated cryptographic proposal. The stated evidence at the Aspen agricultural office instead concerns gre over ipsec mtu and mss.

D:

This could help where mpls unlabelled core hop is the issue, but not for the evidence reported at the Aspen agricultural office. Encapsulation reduces effective payload MTU, causing large packets to fragment or be dropped.