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Implementing Cisco Enterprise Network Core Technologies (ENCOR) 350-401 Practice Test 32

Question 310

A post-change test follows this action: check the DR/BDR topology and neighbor state rather than manually filtering LSAs. Which result demonstrates success?

  1. `show ip route ospf` lists both ECMP next hops for the destination.
  2. The LSDB-derived lower-cost path appears as installed route.
  3. External route consumers see the intended aggregate LSA.
  4. The segment shows one DR and one BDR and healthy adjacent peers.

Explanation

Correct Answer

D:

The segment shows one DR and one BDR and healthy adjacent peers. This is the targeted operational evidence for the change. Broadcast OSPF controls flooding with elected DR/BDR relationships. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Permit OSPF equal-cost multipath at the configured maximum-paths value. OSPF can install multiple next hops with equal computed metric. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

B:

This observation validates another operation: Inspect cumulative OSPF cost rather than counting hops. SPF selects lowest total link cost, not fewest routers. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Use OSPF summary-address on the ASBR where supported. External LSA summarization is distinct from ABR interarea ranges. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 311

Two equal-cost OSPF routes exist and traffic should use both. What is the most effective configuration or design response?

  1. Adjust OSPF reference bandwidth consistently across the domain.
  2. Configure an OSPF area range summary at the ABR.
  3. Permit OSPF equal-cost multipath at the configured maximum-paths value.
  4. Recognize that ABR prefix filtering primarily controls interarea summary advertisement.

Explanation

Correct Answer

C:

OSPF can install multiple next hops with equal computed metric. The most direct remediation is permit OSPF equal-cost multipath at the configured maximum-paths value. A practical acceptance test is `show ip route ospf` lists both ECMP next hops for the destination. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: A 10-Gbps link is treated with the same OSPF cost as a slower link. The default reference bandwidth can underrepresent high-speed interface differences. It does not specifically correct the issue here: two equal-cost OSPF routes exist and traffic should use both.

B:

This choice addresses a different situation: An ABR should aggregate contiguous area 10 networks toward area 0. Interarea summary consolidation belongs on the ABR. It does not specifically correct the issue here: two equal-cost OSPF routes exist and traffic should use both.

D:

This choice addresses a different situation: An OSPF filter-list is applied but intra-area routes still appear. An ABR filter-list is not a generic replacement for intra-area LSDB consistency. It does not specifically correct the issue here: two equal-cost OSPF routes exist and traffic should use both.

Question 312

During acceptance testing after permit OSPF equal-cost multipath at the configured maximum-paths value., which evidence is most relevant?

  1. `show ip ospf interface` reports intended proportional interface costs.
  2. `show ip route ospf` lists both ECMP next hops for the destination.
  3. Area 0 routers see the intended aggregate rather than every child prefix.
  4. Filtered type-3 interarea summaries disappear while intra-area LSAs remain.

Explanation

Correct Answer

B:

`show ip route ospf` lists both ECMP next hops for the destination. This is the targeted operational evidence for the change. OSPF can install multiple next hops with equal computed metric. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Adjust OSPF reference bandwidth consistently across the domain. The default reference bandwidth can underrepresent high-speed interface differences. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Configure an OSPF area range summary at the ABR. Interarea summary consolidation belongs on the ABR. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

D:

This observation validates another operation: Recognize that ABR prefix filtering primarily controls interarea summary advertisement. An ABR filter-list is not a generic replacement for intra-area LSDB consistency. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 313

A 10-Gbps link is treated with the same OSPF cost as a slower link. Which change should the network engineer prioritize?

  1. Adjust OSPF reference bandwidth consistently across the domain.
  2. Inspect cumulative OSPF cost rather than counting hops.
  3. Use OSPF summary-address on the ASBR where supported.
  4. Enable an appropriate OSPFv3 IPv6 address family on the interfaces.

Explanation

Correct Answer

A:

The default reference bandwidth can underrepresent high-speed interface differences. The most direct remediation is adjust OSPF reference bandwidth consistently across the domain. A practical acceptance test is `show ip ospf interface` reports intended proportional interface costs. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: An OSPF route uses an unexpected long path despite shorter hop count. SPF selects lowest total link cost, not fewest routers. It does not specifically correct the issue here: a 10-Gbps link is treated with the same OSPF cost as a slower link.

C:

This choice addresses a different situation: An ASBR redistributes many static routes that must be summarized. External LSA summarization is distinct from ABR interarea ranges. It does not specifically correct the issue here: a 10-Gbps link is treated with the same OSPF cost as a slower link.

D:

This choice addresses a different situation: IPv6 OSPF adjacencies are missing because a v2-only process is configured. OSPFv3 can carry IPv6 reachability with its supported interface configuration. It does not specifically correct the issue here: a 10-Gbps link is treated with the same OSPF cost as a slower link.

Question 314

An operator has applied the following change: adjust OSPF reference bandwidth consistently across the domain. Which observation best confirms it works?

  1. The LSDB-derived lower-cost path appears as installed route.
  2. External route consumers see the intended aggregate LSA.
  3. `show ospfv3 neighbor` reaches FULL and IPv6 routes install.
  4. `show ip ospf interface` reports intended proportional interface costs.

Explanation

Correct Answer

D:

`show ip ospf interface` reports intended proportional interface costs. This is the targeted operational evidence for the change. The default reference bandwidth can underrepresent high-speed interface differences. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Inspect cumulative OSPF cost rather than counting hops. SPF selects lowest total link cost, not fewest routers. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

B:

This observation validates another operation: Use OSPF summary-address on the ASBR where supported. External LSA summarization is distinct from ABR interarea ranges. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Enable an appropriate OSPFv3 IPv6 address family on the interfaces. OSPFv3 can carry IPv6 reachability with its supported interface configuration. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 315

An OSPF route uses an unexpected long path despite shorter hop count. Which remediation best resolves the described symptom?

  1. Configure an OSPF area range summary at the ABR.
  2. Recognize that ABR prefix filtering primarily controls interarea summary advertisement.
  3. Inspect cumulative OSPF cost rather than counting hops.
  4. Verify OSPFv3 link-local neighbor discovery and matching area configuration.

Explanation

Correct Answer

C:

SPF selects lowest total link cost, not fewest routers. The most direct remediation is inspect cumulative OSPF cost rather than counting hops. A practical acceptance test is the LSDB-derived lower-cost path appears as installed route. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: An ABR should aggregate contiguous area 10 networks toward area 0. Interarea summary consolidation belongs on the ABR. It does not specifically correct the issue here: an OSPF route uses an unexpected long path despite shorter hop count.

B:

This choice addresses a different situation: An OSPF filter-list is applied but intra-area routes still appear. An ABR filter-list is not a generic replacement for intra-area LSDB consistency. It does not specifically correct the issue here: an OSPF route uses an unexpected long path despite shorter hop count.

D:

This choice addresses a different situation: An OSPFv3 router has IPv6 reachability but no neighbors over the link. OSPFv3 neighbor relationships use link-local adjacency behavior. It does not specifically correct the issue here: an OSPF route uses an unexpected long path despite shorter hop count.

Question 316

After implementing inspect cumulative OSPF cost rather than counting hops., which operational evidence should an engineer collect?

  1. Area 0 routers see the intended aggregate rather than every child prefix.
  2. The LSDB-derived lower-cost path appears as installed route.
  3. Filtered type-3 interarea summaries disappear while intra-area LSAs remain.
  4. IPv6 link-local neighbor addresses appear in OSPFv3 neighbor output.

Explanation

Correct Answer

B:

The LSDB-derived lower-cost path appears as installed route. This is the targeted operational evidence for the change. SPF selects lowest total link cost, not fewest routers. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Configure an OSPF area range summary at the ABR. Interarea summary consolidation belongs on the ABR. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Recognize that ABR prefix filtering primarily controls interarea summary advertisement. An ABR filter-list is not a generic replacement for intra-area LSDB consistency. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

D:

This observation validates another operation: Verify OSPFv3 link-local neighbor discovery and matching area configuration. OSPFv3 neighbor relationships use link-local adjacency behavior. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 317

An ABR should aggregate contiguous area 10 networks toward area 0. How should the team implement the required behavior?

  1. Configure an OSPF area range summary at the ABR.
  2. Use OSPF summary-address on the ASBR where supported.
  3. Enable an appropriate OSPFv3 IPv6 address family on the interfaces.
  4. Make stub/NSSA capability and area type consistent on the peers.

Explanation

Correct Answer

A:

Interarea summary consolidation belongs on the ABR. The most direct remediation is configure an OSPF area range summary at the ABR. A practical acceptance test is area 0 routers see the intended aggregate rather than every child prefix. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: An ASBR redistributes many static routes that must be summarized. External LSA summarization is distinct from ABR interarea ranges. It does not specifically correct the issue here: an ABR should aggregate contiguous area 10 networks toward area 0.

C:

This choice addresses a different situation: IPv6 OSPF adjacencies are missing because a v2-only process is configured. OSPFv3 can carry IPv6 reachability with its supported interface configuration. It does not specifically correct the issue here: an ABR should aggregate contiguous area 10 networks toward area 0.

D:

This choice addresses a different situation: A new OSPFv2 area has mismatched area type options across adjacent routers. OSPF options mismatches can prevent adjacency even with working IP. It does not specifically correct the issue here: an ABR should aggregate contiguous area 10 networks toward area 0.

Question 318

The change request says: configure an OSPF area range summary at the ABR. Which verification result is most decisive?

  1. External route consumers see the intended aggregate LSA.
  2. `show ospfv3 neighbor` reaches FULL and IPv6 routes install.
  3. Neighbor reaches FULL after matching area-type option bits.
  4. Area 0 routers see the intended aggregate rather than every child prefix.

Explanation

Correct Answer

D:

Area 0 routers see the intended aggregate rather than every child prefix. This is the targeted operational evidence for the change. Interarea summary consolidation belongs on the ABR. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Use OSPF summary-address on the ASBR where supported. External LSA summarization is distinct from ABR interarea ranges. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

B:

This observation validates another operation: Enable an appropriate OSPFv3 IPv6 address family on the interfaces. OSPFv3 can carry IPv6 reachability with its supported interface configuration. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Make stub/NSSA capability and area type consistent on the peers. OSPF options mismatches can prevent adjacency even with working IP. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 319

An ASBR redistributes many static routes that must be summarized. What is the most appropriate corrective measure?

  1. Recognize that ABR prefix filtering primarily controls interarea summary advertisement.
  2. Verify OSPFv3 link-local neighbor discovery and matching area configuration.
  3. Use OSPF summary-address on the ASBR where supported.
  4. Evaluate EIGRP bandwidth/delay and OSPF cost separately.

Explanation

Correct Answer

C:

External LSA summarization is distinct from ABR interarea ranges. The most direct remediation is use OSPF summary-address on the ASBR where supported. A practical acceptance test is external route consumers see the intended aggregate LSA. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: An OSPF filter-list is applied but intra-area routes still appear. An ABR filter-list is not a generic replacement for intra-area LSDB consistency. It does not specifically correct the issue here: an ASBR redistributes many static routes that must be summarized.

B:

This choice addresses a different situation: An OSPFv3 router has IPv6 reachability but no neighbors over the link. OSPFv3 neighbor relationships use link-local adjacency behavior. It does not specifically correct the issue here: an ASBR redistributes many static routes that must be summarized.

D:

This choice addresses a different situation: A design uses EIGRP and needs to compare its composite metric with OSPF cost. EIGRP metric logic differs from SPF cost accumulation. It does not specifically correct the issue here: an ASBR redistributes many static routes that must be summarized.

Question 320

A post-change test follows this action: use OSPF summary-address on the ASBR where supported. Which result demonstrates success?

  1. Filtered type-3 interarea summaries disappear while intra-area LSAs remain.
  2. External route consumers see the intended aggregate LSA.
  3. IPv6 link-local neighbor addresses appear in OSPFv3 neighbor output.
  4. Routing output reveals EIGRP feasible distance versus OSPF total cost.

Explanation

Correct Answer

B:

External route consumers see the intended aggregate LSA. This is the targeted operational evidence for the change. External LSA summarization is distinct from ABR interarea ranges. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Recognize that ABR prefix filtering primarily controls interarea summary advertisement. An ABR filter-list is not a generic replacement for intra-area LSDB consistency. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Verify OSPFv3 link-local neighbor discovery and matching area configuration. OSPFv3 neighbor relationships use link-local adjacency behavior. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

D:

This observation validates another operation: Evaluate EIGRP bandwidth/delay and OSPF cost separately. EIGRP metric logic differs from SPF cost accumulation. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Implementing Cisco Enterprise Network Core Technologies (ENCOR) (350-401) Practice Tests

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