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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 26

Question 250

At the Foothill municipal site, a point-to-point circuit is modeled as broadcast on one OSPF side and point-to-point on the other, producing inconsistent neighbor behavior. Which underlying technical condition best accounts for this evidence?

  1. Incompatible interface MTU values can prevent successful OSPF database-description exchange.
  2. OSPF neighbor packets describe incompatible area membership for a common link.
  3. Authentication settings on the OSPF peers no longer match, so received protocol packets are rejected.
  4. Different OSPF network-type expectations lead to inconsistent adjacency and DR behavior.

Explanation

Correct Answer

D:

The evidence at the Foothill municipal site supports this condition: Different OSPF network-type expectations lead to inconsistent adjacency and DR behavior. The associated fix is: Set compatible OSPF network types appropriate to the actual transit medium on both ends.

Incorrect Answers

A:

The observation at the Foothill municipal site does not point to ospf mtu exstart; it points to a different condition. Different OSPF network-type expectations lead to inconsistent adjacency and DR behavior.

B:

This diagnoses a different mechanism: OSPF neighbor packets describe incompatible area membership for a common link. The reported symptom at the Foothill municipal site instead concerns ospf dr network-type mismatch.

C:

That diagnosis belongs to ospf authentication mismatch, while the observation at the Foothill municipal site points to ospf dr network-type mismatch.

Question 251

At the Silverstream data center, routers in an OSPF stub area disagree on stub-area capability and fail to form neighbors after R-RIV-PE2 was reconfigured. Which underlying technical condition best accounts for this evidence?

  1. Authentication settings on the OSPF peers no longer match, so received protocol packets are rejected.
  2. A virtual link cannot use a stub area as its transit area to repair backbone connectivity.
  3. The OSPF Hello options differ because one router does not agree that the area is a stub.
  4. Incompatible interface MTU values can prevent successful OSPF database-description exchange.

Explanation

Correct Answer

C:

The OSPF Hello options differ because one router does not agree that the area is a stub. That explains the specific symptom at the Silverstream data center. A direct corrective action is: Make OSPF stub-area attributes consistent for the peers sharing the area.

Incorrect Answers

A:

That diagnosis belongs to ospf authentication mismatch, while the observation at the Silverstream data center points to ospf stub area options mismatch.

B:

The observation at the Silverstream data center does not point to ospf virtual link transit area; it points to a different condition. The OSPF Hello options differ because one router does not agree that the area is a stub.

D:

That diagnosis belongs to ospf mtu exstart, while the observation at the Silverstream data center points to ospf stub area options mismatch.

Question 252

At the Brookstone distribution branch, routers in an OSPF stub area disagree on stub-area capability and fail to form neighbors after R-NEW-EDGE2 was reconfigured. Which underlying technical condition best accounts for this evidence?

  1. Different OSPF network-type expectations lead to inconsistent adjacency and DR behavior.
  2. The OSPF Hello options differ because one router does not agree that the area is a stub.
  3. OSPF prefers intra-area routes to inter-area routes for the same prefix even when cost figures differ.
  4. NSSA external routes use type-7 LSAs internally and depend on translation for normal areas.

Explanation

Correct Answer

B:

This diagnosis fits the symptoms at the Brookstone distribution branch. The OSPF Hello options differ because one router does not agree that the area is a stub. The remedial action is: Make OSPF stub-area attributes consistent for the peers sharing the area.

Incorrect Answers

A:

This diagnoses a different mechanism: Different OSPF network-type expectations lead to inconsistent adjacency and DR behavior. The reported symptom at the Brookstone distribution branch instead concerns ospf stub area options mismatch.

C:

The observation at the Brookstone distribution branch does not point to ospf intra-area route preference; it points to a different condition. The OSPF Hello options differ because one router does not agree that the area is a stub.

D:

This diagnoses a different mechanism: NSSA external routes use type-7 LSAs internally and depend on translation for normal areas. The reported symptom at the Brookstone distribution branch instead concerns ospf stub area options mismatch.

Question 253

At the Southridge banking office, an ASBR inside an OSPF NSSA originates an external route, but the ABR is not translating the expected type-7 route for other areas. Which underlying technical condition best accounts for this evidence?

  1. Incompatible interface MTU values can prevent successful OSPF database-description exchange.
  2. OSPF prefers intra-area routes to inter-area routes for the same prefix even when cost figures differ.
  3. NSSA external routes use type-7 LSAs internally and depend on translation for normal areas.
  4. The OSPF Hello options differ because one router does not agree that the area is a stub.

Explanation

Correct Answer

C:

This diagnosis fits the symptoms at the Southridge banking office. NSSA external routes use type-7 LSAs internally and depend on translation for normal areas. The remedial action is: Verify NSSA type-7 origination and the ABR translation behavior for the external prefix.

Incorrect Answers

A:

The observation at the Southridge banking office does not point to ospf mtu exstart; it points to a different condition. NSSA external routes use type-7 LSAs internally and depend on translation for normal areas.

B:

This diagnoses a different mechanism: OSPF prefers intra-area routes to inter-area routes for the same prefix even when cost figures differ. The reported symptom at the Southridge banking office instead concerns ospf nssa external routes.

D:

The observation at the Southridge banking office does not point to ospf stub area options mismatch; it points to a different condition. NSSA external routes use type-7 LSAs internally and depend on translation for normal areas.

Question 254

At the Lakeside transit hub, an ASBR inside an OSPF NSSA originates an external route, but the ABR is not translating the expected type-7 route for other areas. Which underlying technical condition best accounts for this evidence?

  1. NSSA external routes use type-7 LSAs internally and depend on translation for normal areas.
  2. Incompatible interface MTU values can prevent successful OSPF database-description exchange.
  3. OSPF prefers intra-area routes to inter-area routes for the same prefix even when cost figures differ.
  4. Authentication settings on the OSPF peers no longer match, so received protocol packets are rejected.

Explanation

Correct Answer

A:

This diagnosis fits the symptoms at the Lakeside transit hub. NSSA external routes use type-7 LSAs internally and depend on translation for normal areas. The remedial action is: Verify NSSA type-7 origination and the ABR translation behavior for the external prefix.

Incorrect Answers

B:

The observation at the Lakeside transit hub does not point to ospf mtu exstart; it points to a different condition. NSSA external routes use type-7 LSAs internally and depend on translation for normal areas.

C:

This diagnoses a different mechanism: OSPF prefers intra-area routes to inter-area routes for the same prefix even when cost figures differ. The reported symptom at the Lakeside transit hub instead concerns ospf nssa external routes.

D:

That diagnosis belongs to ospf authentication mismatch, while the observation at the Lakeside transit hub points to ospf nssa external routes.

Question 255

At the Pinecrest freight terminal, an isolated OSPF area cannot reach the backbone through its intended ABR because the virtual link traverses a stub transit area. Which underlying technical condition best accounts for this evidence?

  1. A virtual link cannot use a stub area as its transit area to repair backbone connectivity.
  2. Authentication settings on the OSPF peers no longer match, so received protocol packets are rejected.
  3. OSPF prefers intra-area routes to inter-area routes for the same prefix even when cost figures differ.
  4. OSPF neighbor packets describe incompatible area membership for a common link.

Explanation

Correct Answer

A:

A virtual link cannot use a stub area as its transit area to repair backbone connectivity. That explains the specific symptom at the Pinecrest freight terminal. A direct corrective action is: Rework the backbone connection or place the OSPF virtual link over an eligible non-stub transit area.

Incorrect Answers

B:

That diagnosis belongs to ospf authentication mismatch, while the observation at the Pinecrest freight terminal points to ospf virtual link transit area.

C:

The observation at the Pinecrest freight terminal does not point to ospf intra-area route preference; it points to a different condition. A virtual link cannot use a stub area as its transit area to repair backbone connectivity.

D:

This diagnoses a different mechanism: OSPF neighbor packets describe incompatible area membership for a common link. The reported symptom at the Pinecrest freight terminal instead concerns ospf virtual link transit area.

Question 256

At the Westlake utility network, an isolated OSPF area cannot reach the backbone through its intended ABR because the virtual link traverses a stub transit area. Which underlying technical condition best accounts for this evidence?

  1. OSPF neighbor packets describe incompatible area membership for a common link.
  2. The OSPF Hello options differ because one router does not agree that the area is a stub.
  3. A virtual link cannot use a stub area as its transit area to repair backbone connectivity.
  4. NSSA external routes use type-7 LSAs internally and depend on translation for normal areas.

Explanation

Correct Answer

C:

This diagnosis fits the symptoms at the Westlake utility network. A virtual link cannot use a stub area as its transit area to repair backbone connectivity. The remedial action is: Rework the backbone connection or place the OSPF virtual link over an eligible non-stub transit area.

Incorrect Answers

A:

The observation at the Westlake utility network does not point to ospf area mismatch; it points to a different condition. A virtual link cannot use a stub area as its transit area to repair backbone connectivity.

B:

This diagnoses a different mechanism: The OSPF Hello options differ because one router does not agree that the area is a stub. The reported symptom at the Westlake utility network instead concerns ospf virtual link transit area.

D:

The observation at the Westlake utility network does not point to ospf nssa external routes; it points to a different condition. A virtual link cannot use a stub area as its transit area to repair backbone connectivity.

Question 257

At the Bluewater clinical network, an OSPF prefix arrives as an intra-area and an inter-area path, but an engineer assumes the lower displayed metric always makes the inter-area route preferable. Which underlying technical condition best accounts for this evidence?

  1. A virtual link cannot use a stub area as its transit area to repair backbone connectivity.
  2. OSPF prefers intra-area routes to inter-area routes for the same prefix even when cost figures differ.
  3. Different OSPF network-type expectations lead to inconsistent adjacency and DR behavior.
  4. Authentication settings on the OSPF peers no longer match, so received protocol packets are rejected.

Explanation

Correct Answer

B:

The evidence at the Bluewater clinical network supports this condition: OSPF prefers intra-area routes to inter-area routes for the same prefix even when cost figures differ. The associated fix is: Evaluate OSPF path type precedence before comparing costs between intra-area and inter-area candidates.

Incorrect Answers

A:

That diagnosis belongs to ospf virtual link transit area, while the observation at the Bluewater clinical network points to ospf intra-area route preference.

C:

This diagnoses a different mechanism: Different OSPF network-type expectations lead to inconsistent adjacency and DR behavior. The reported symptom at the Bluewater clinical network instead concerns ospf intra-area route preference.

D:

That diagnosis belongs to ospf authentication mismatch, while the observation at the Bluewater clinical network points to ospf intra-area route preference.

Question 258

At the Cedarfield retail branch, an OSPF prefix arrives as an intra-area and an inter-area path, but an engineer assumes the lower displayed metric always makes the inter-area route preferable. Which underlying technical condition best accounts for this evidence?

  1. A virtual link cannot use a stub area as its transit area to repair backbone connectivity.
  2. OSPF neighbor packets describe incompatible area membership for a common link.
  3. NSSA external routes use type-7 LSAs internally and depend on translation for normal areas.
  4. OSPF prefers intra-area routes to inter-area routes for the same prefix even when cost figures differ.

Explanation

Correct Answer

D:

OSPF prefers intra-area routes to inter-area routes for the same prefix even when cost figures differ. That explains the specific symptom at the Cedarfield retail branch. A direct corrective action is: Evaluate OSPF path type precedence before comparing costs between intra-area and inter-area candidates.

Incorrect Answers

A:

This diagnoses a different mechanism: A virtual link cannot use a stub area as its transit area to repair backbone connectivity. The reported symptom at the Cedarfield retail branch instead concerns ospf intra-area route preference.

B:

That diagnosis belongs to ospf area mismatch, while the observation at the Cedarfield retail branch points to ospf intra-area route preference.

C:

The observation at the Cedarfield retail branch does not point to ospf nssa external routes; it points to a different condition. OSPF prefers intra-area routes to inter-area routes for the same prefix even when cost figures differ.

Question 259

At the Ironwood training campus, R-IRN-RT1 must peer by eBGP with a reachable loopback on R-CLR-RT2 multiple routed hops away; TCP never reaches Established using default TTL behavior. Which underlying technical condition best accounts for this evidence?

  1. The iBGP-learned path retains a next hop that the receiving router cannot resolve.
  2. The default eBGP directly connected peer assumptions do not support this multiple-hop session.
  3. The current inbound BGP policy fails to constrain accepted advertisements to contracted prefixes.
  4. Cisco BGP weight affects path selection only on the local router and is not propagated to peers.

Explanation

Correct Answer

B:

The default eBGP directly connected peer assumptions do not support this multiple-hop session. That explains the specific symptom at the Ironwood training campus. A direct corrective action is: Configure eBGP multihop and reliable loopback reachability for the non-direct peer as appropriate.

Incorrect Answers

A:

The observation at the Ironwood training campus does not point to ibgp next-hop reachability; it points to a different condition. The default eBGP directly connected peer assumptions do not support this multiple-hop session.

C:

That diagnosis belongs to bgp inbound prefix filtering, while the observation at the Ironwood training campus points to ebgp non-direct neighbor multihop.

D:

The observation at the Ironwood training campus does not point to bgp cisco weight local only; it points to a different condition. The default eBGP directly connected peer assumptions do not support this multiple-hop session.

Question 260

At the Harborview media campus, R-HAR-DIST1 must peer by eBGP with a reachable loopback on R-INL-DIST2 multiple routed hops away; TCP never reaches Established using default TTL behavior. Which underlying technical condition best accounts for this evidence?

  1. The current inbound BGP policy fails to constrain accepted advertisements to contracted prefixes.
  2. BGP local preference is examined before AS-path length, and the present attributes favor the wrong exit.
  3. The default eBGP directly connected peer assumptions do not support this multiple-hop session.
  4. The iBGP-learned path retains a next hop that the receiving router cannot resolve.

Explanation

Correct Answer

C:

The default eBGP directly connected peer assumptions do not support this multiple-hop session. That explains the specific symptom at the Harborview media campus. A direct corrective action is: Configure eBGP multihop and reliable loopback reachability for the non-direct peer as appropriate.

Incorrect Answers

A:

That diagnosis belongs to bgp inbound prefix filtering, while the observation at the Harborview media campus points to ebgp non-direct neighbor multihop.

B:

The observation at the Harborview media campus does not point to bgp local preference path policy; it points to a different condition. The default eBGP directly connected peer assumptions do not support this multiple-hop session.

D:

That diagnosis belongs to ibgp next-hop reachability, while the observation at the Harborview media campus points to ebgp non-direct neighbor multihop.