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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 30

Question 290

At the Cedarbrook hospital, two DMVPN devices share a reachable underlay yet their NHRP configuration reports incompatible network identifiers. Which underlying technical condition best accounts for this evidence?

  1. The NHRP tunnel interfaces are not configured to participate in the same logical NHRP network.
  2. Underlay IP reachability is present, but the spoke is not registering its tunnel-to-NBMA mapping with the correct NHRP server.
  3. Hub-side next-hop rewriting prevents the source spoke from resolving the actual destination spoke.
  4. A fixed GRE destination prevents the tunnel from supporting arbitrary on-demand spoke destinations.

Explanation

Correct Answer

A:

This diagnosis fits the symptoms at the Cedarbrook hospital. The NHRP tunnel interfaces are not configured to participate in the same logical NHRP network. The remedial action is: Set matching NHRP network identifiers on tunnel interfaces participating in the same DMVPN cloud.

Incorrect Answers

B:

The observation at the Cedarbrook hospital does not point to dmvpn spoke registration to hub; it points to a different condition. The NHRP tunnel interfaces are not configured to participate in the same logical NHRP network.

C:

This diagnoses a different mechanism: Hub-side next-hop rewriting prevents the source spoke from resolving the actual destination spoke. The reported symptom at the Cedarbrook hospital instead concerns dmvpn nhrp network id mismatch.

D:

That diagnosis belongs to dmvpn mgre endpoint capability, while the observation at the Cedarbrook hospital points to dmvpn nhrp network id mismatch.

Question 291

At the Bayview university campus, a new spoke sends NHRP registration requests but the hub rejects them after a credential rotation. Which underlying technical condition best accounts for this evidence?

  1. The NHRP tunnel interfaces are not configured to participate in the same logical NHRP network.
  2. NHRP registration messages are rejected because peers do not agree on their authentication secret.
  3. NHRP messages are targeted at an obsolete next-hop server address even though the underlay works.
  4. The origin spoke has not obtained the peer resolution needed to build an appropriate direct path.

Explanation

Correct Answer

B:

This diagnosis fits the symptoms at the Bayview university campus. NHRP registration messages are rejected because peers do not agree on their authentication secret. The remedial action is: Align NHRP authentication credentials between the spoke and its trusted hub.

Incorrect Answers

A:

This diagnoses a different mechanism: The NHRP tunnel interfaces are not configured to participate in the same logical NHRP network. The reported symptom at the Bayview university campus instead concerns dmvpn nhrp authentication mismatch.

C:

The observation at the Bayview university campus does not point to dmvpn spoke next-hop server address; it points to a different condition. NHRP registration messages are rejected because peers do not agree on their authentication secret.

D:

This diagnoses a different mechanism: The origin spoke has not obtained the peer resolution needed to build an appropriate direct path. The reported symptom at the Bayview university campus instead concerns dmvpn nhrp authentication mismatch.

Question 292

At the Clearwater library district, a new spoke sends NHRP registration requests but the hub rejects them after a credential rotation. Which underlying technical condition best accounts for this evidence?

  1. NHRP messages are targeted at an obsolete next-hop server address even though the underlay works.
  2. Dynamic routing multicast is not properly mapped over the nonbroadcast DMVPN transport.
  3. Required phase 3 NHRP redirect and shortcut exchanges are missing or not functioning.
  4. NHRP registration messages are rejected because peers do not agree on their authentication secret.

Explanation

Correct Answer

D:

The evidence at the Clearwater library district supports this condition: NHRP registration messages are rejected because peers do not agree on their authentication secret. The associated fix is: Align NHRP authentication credentials between the spoke and its trusted hub.

Incorrect Answers

A:

The observation at the Clearwater library district does not point to dmvpn spoke next-hop server address; it points to a different condition. NHRP registration messages are rejected because peers do not agree on their authentication secret.

B:

This diagnoses a different mechanism: Dynamic routing multicast is not properly mapped over the nonbroadcast DMVPN transport. The reported symptom at the Clearwater library district instead concerns dmvpn nhrp authentication mismatch.

C:

That diagnosis belongs to dmvpn phase 3 redirect and shortcut, while the observation at the Clearwater library district points to dmvpn nhrp authentication mismatch.

Question 293

At the Highland government office, an operator expects one DMVPN spoke tunnel interface to build dynamic tunnels toward multiple remote peers but configures only a fixed point-to-point GRE destination. Which underlying technical condition best accounts for this evidence?

  1. Hub-side next-hop rewriting prevents the source spoke from resolving the actual destination spoke.
  2. A fixed GRE destination prevents the tunnel from supporting arbitrary on-demand spoke destinations.
  3. Underlay IP reachability is present, but the spoke is not registering its tunnel-to-NBMA mapping with the correct NHRP server.
  4. Required phase 3 NHRP redirect and shortcut exchanges are missing or not functioning.

Explanation

Correct Answer

B:

The evidence at the Highland government office supports this condition: A fixed GRE destination prevents the tunnel from supporting arbitrary on-demand spoke destinations. The associated fix is: Use an appropriate multipoint GRE tunnel and NHRP resolution for dynamically discovered peers.

Incorrect Answers

A:

That diagnosis belongs to dmvpn phase 2 spoke next-hop preservation, while the observation at the Highland government office points to dmvpn mgre endpoint capability.

C:

This diagnoses a different mechanism: Underlay IP reachability is present, but the spoke is not registering its tunnel-to-NBMA mapping with the correct NHRP server. The reported symptom at the Highland government office instead concerns dmvpn mgre endpoint capability.

D:

That diagnosis belongs to dmvpn phase 3 redirect and shortcut, while the observation at the Highland government office points to dmvpn mgre endpoint capability.

Question 294

At the Foothill municipal site, an operator expects one DMVPN spoke tunnel interface to build dynamic tunnels toward multiple remote peers but configures only a fixed point-to-point GRE destination. Which underlying technical condition best accounts for this evidence?

  1. Dynamic routing multicast is not properly mapped over the nonbroadcast DMVPN transport.
  2. The NHRP tunnel interfaces are not configured to participate in the same logical NHRP network.
  3. A fixed GRE destination prevents the tunnel from supporting arbitrary on-demand spoke destinations.
  4. Hub-side next-hop rewriting prevents the source spoke from resolving the actual destination spoke.

Explanation

Correct Answer

C:

The evidence at the Foothill municipal site supports this condition: A fixed GRE destination prevents the tunnel from supporting arbitrary on-demand spoke destinations. The associated fix is: Use an appropriate multipoint GRE tunnel and NHRP resolution for dynamically discovered peers.

Incorrect Answers

A:

This diagnoses a different mechanism: Dynamic routing multicast is not properly mapped over the nonbroadcast DMVPN transport. The reported symptom at the Foothill municipal site instead concerns dmvpn mgre endpoint capability.

B:

That diagnosis belongs to dmvpn nhrp network id mismatch, while the observation at the Foothill municipal site points to dmvpn mgre endpoint capability.

D:

This diagnoses a different mechanism: Hub-side next-hop rewriting prevents the source spoke from resolving the actual destination spoke. The reported symptom at the Foothill municipal site instead concerns dmvpn mgre endpoint capability.

Question 295

At the Silverstream data center, a newly installed spoke has the right NHRP network ID, yet it sends server queries to a retired hub tunnel address. Which underlying technical condition best accounts for this evidence?

  1. Underlay IP reachability is present, but the spoke is not registering its tunnel-to-NBMA mapping with the correct NHRP server.
  2. A fixed GRE destination prevents the tunnel from supporting arbitrary on-demand spoke destinations.
  3. NHRP messages are targeted at an obsolete next-hop server address even though the underlay works.
  4. Required phase 3 NHRP redirect and shortcut exchanges are missing or not functioning.

Explanation

Correct Answer

C:

This diagnosis fits the symptoms at the Silverstream data center. NHRP messages are targeted at an obsolete next-hop server address even though the underlay works. The remedial action is: Update the spoke's NHRP NHS reference and relevant NBMA mapping to the operational hub.

Incorrect Answers

A:

The observation at the Silverstream data center does not point to dmvpn spoke registration to hub; it points to a different condition. NHRP messages are targeted at an obsolete next-hop server address even though the underlay works.

B:

This diagnoses a different mechanism: A fixed GRE destination prevents the tunnel from supporting arbitrary on-demand spoke destinations. The reported symptom at the Silverstream data center instead concerns dmvpn spoke next-hop server address.

D:

The observation at the Silverstream data center does not point to dmvpn phase 3 redirect and shortcut; it points to a different condition. NHRP messages are targeted at an obsolete next-hop server address even though the underlay works.

Question 296

At the Brookstone distribution branch, a newly installed spoke has the right NHRP network ID, yet it sends server queries to a retired hub tunnel address. Which underlying technical condition best accounts for this evidence?

  1. Underlay IP reachability is present, but the spoke is not registering its tunnel-to-NBMA mapping with the correct NHRP server.
  2. Dynamic routing multicast is not properly mapped over the nonbroadcast DMVPN transport.
  3. NHRP messages are targeted at an obsolete next-hop server address even though the underlay works.
  4. NHRP registration messages are rejected because peers do not agree on their authentication secret.

Explanation

Correct Answer

C:

NHRP messages are targeted at an obsolete next-hop server address even though the underlay works. That explains the specific symptom at the Brookstone distribution branch. A direct corrective action is: Update the spoke's NHRP NHS reference and relevant NBMA mapping to the operational hub.

Incorrect Answers

A:

That diagnosis belongs to dmvpn spoke registration to hub, while the observation at the Brookstone distribution branch points to dmvpn spoke next-hop server address.

B:

The observation at the Brookstone distribution branch does not point to dmvpn multicast mapping for igp; it points to a different condition. NHRP messages are targeted at an obsolete next-hop server address even though the underlay works.

D:

That diagnosis belongs to dmvpn nhrp authentication mismatch, while the observation at the Brookstone distribution branch points to dmvpn spoke next-hop server address.

Question 297

At the Southridge banking office, DMVPN unicast tunnel traffic reaches the hub but a multicast-dependent dynamic routing neighbor never forms across the tunnel. Which underlying technical condition best accounts for this evidence?

  1. NHRP messages are targeted at an obsolete next-hop server address even though the underlay works.
  2. A fixed GRE destination prevents the tunnel from supporting arbitrary on-demand spoke destinations.
  3. Required phase 3 NHRP redirect and shortcut exchanges are missing or not functioning.
  4. Dynamic routing multicast is not properly mapped over the nonbroadcast DMVPN transport.

Explanation

Correct Answer

D:

Dynamic routing multicast is not properly mapped over the nonbroadcast DMVPN transport. That explains the specific symptom at the Southridge banking office. A direct corrective action is: Provide appropriate NHRP multicast mapping or dynamic multicast handling for the hub-spoke design.

Incorrect Answers

A:

This diagnoses a different mechanism: NHRP messages are targeted at an obsolete next-hop server address even though the underlay works. The reported symptom at the Southridge banking office instead concerns dmvpn multicast mapping for igp.

B:

That diagnosis belongs to dmvpn mgre endpoint capability, while the observation at the Southridge banking office points to dmvpn multicast mapping for igp.

C:

The observation at the Southridge banking office does not point to dmvpn phase 3 redirect and shortcut; it points to a different condition. Dynamic routing multicast is not properly mapped over the nonbroadcast DMVPN transport.

Question 298

At the Lakeside transit hub, DMVPN unicast tunnel traffic reaches the hub but a multicast-dependent dynamic routing neighbor never forms across the tunnel. Which underlying technical condition best accounts for this evidence?

  1. Underlay IP reachability is present, but the spoke is not registering its tunnel-to-NBMA mapping with the correct NHRP server.
  2. A fixed GRE destination prevents the tunnel from supporting arbitrary on-demand spoke destinations.
  3. NHRP registration messages are rejected because peers do not agree on their authentication secret.
  4. Dynamic routing multicast is not properly mapped over the nonbroadcast DMVPN transport.

Explanation

Correct Answer

D:

The evidence at the Lakeside transit hub supports this condition: Dynamic routing multicast is not properly mapped over the nonbroadcast DMVPN transport. The associated fix is: Provide appropriate NHRP multicast mapping or dynamic multicast handling for the hub-spoke design.

Incorrect Answers

A:

The observation at the Lakeside transit hub does not point to dmvpn spoke registration to hub; it points to a different condition. Dynamic routing multicast is not properly mapped over the nonbroadcast DMVPN transport.

B:

This diagnoses a different mechanism: A fixed GRE destination prevents the tunnel from supporting arbitrary on-demand spoke destinations. The reported symptom at the Lakeside transit hub instead concerns dmvpn multicast mapping for igp.

C:

That diagnosis belongs to dmvpn nhrp authentication mismatch, while the observation at the Lakeside transit hub points to dmvpn multicast mapping for igp.

Question 299

At the Pinecrest freight terminal, spoke traffic to the Port distribution facility still traverses the hub even though the design requires direct dynamic spoke-to-spoke forwarding. Which underlying technical condition best accounts for this evidence?

  1. The origin spoke has not obtained the peer resolution needed to build an appropriate direct path.
  2. NHRP messages are targeted at an obsolete next-hop server address even though the underlay works.
  3. Dynamic routing multicast is not properly mapped over the nonbroadcast DMVPN transport.
  4. Required phase 3 NHRP redirect and shortcut exchanges are missing or not functioning.

Explanation

Correct Answer

A:

This diagnosis fits the symptoms at the Pinecrest freight terminal. The origin spoke has not obtained the peer resolution needed to build an appropriate direct path. The remedial action is: Verify that NHRP resolves the remote spoke's NBMA address and that direct tunnels are permitted.

Incorrect Answers

B:

The observation at the Pinecrest freight terminal does not point to dmvpn spoke next-hop server address; it points to a different condition. The origin spoke has not obtained the peer resolution needed to build an appropriate direct path.

C:

This diagnoses a different mechanism: Dynamic routing multicast is not properly mapped over the nonbroadcast DMVPN transport. The reported symptom at the Pinecrest freight terminal instead concerns dmvpn spoke-to-spoke nhrp resolution.

D:

That diagnosis belongs to dmvpn phase 3 redirect and shortcut, while the observation at the Pinecrest freight terminal points to dmvpn spoke-to-spoke nhrp resolution.

Question 300

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 underlying technical condition best accounts for this evidence?

  1. The NHRP tunnel interfaces are not configured to participate in the same logical NHRP network.
  2. The origin spoke has not obtained the peer resolution needed to build an appropriate direct path.
  3. Required phase 3 NHRP redirect and shortcut exchanges are missing or not functioning.
  4. Hub-side next-hop rewriting prevents the source spoke from resolving the actual destination spoke.

Explanation

Correct Answer

B:

This diagnosis fits the symptoms at the Westlake utility network. The origin spoke has not obtained the peer resolution needed to build an appropriate direct path. The remedial action is: Verify that NHRP resolves the remote spoke's NBMA address and that direct tunnels are permitted.

Incorrect Answers

A:

This diagnoses a different mechanism: The NHRP tunnel interfaces are not configured to participate in the same logical NHRP network. The reported symptom at the Westlake utility network instead concerns dmvpn spoke-to-spoke nhrp resolution.

C:

The observation at the Westlake utility network does not point to dmvpn phase 3 redirect and shortcut; it points to a different condition. The origin spoke has not obtained the peer resolution needed to build an appropriate direct path.

D:

This diagnoses a different mechanism: Hub-side next-hop rewriting prevents the source spoke from resolving the actual destination spoke. The reported symptom at the Westlake utility network instead concerns dmvpn spoke-to-spoke nhrp resolution.