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Implementing Cisco Enterprise Network Core Technologies (ENCOR) 350-401 Practice Test 31

Question 300

A post-change test follows this action: configure area NSSA consistently on its routers. Which result demonstrates success?

  1. The branch has an interarea default rather than hundreds of remote summaries.
  2. The NSSA database contains local type-7 advertisements and ABR translation as applicable.
  3. `show ip ospf neighbor` reports the intended DR after a new election.
  4. The segment shows one DR and one BDR and healthy adjacent peers.

Explanation

Correct Answer

B:

The NSSA database contains local type-7 advertisements and ABR translation as applicable. This is the targeted operational evidence for the change. An NSSA uses type-7 LSAs for locally redistributed routes. 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 a totally stubby area where supported. Totally stubby areas suppress most summary routes as well as external LSAs. 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: Set its interface OSPF priority appropriately before election. A higher priority (nonzero) gives a router DR election preference. 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: Check the DR/BDR topology and neighbor state rather than manually filtering LSAs. Broadcast OSPF controls flooding with elected DR/BDR relationships. 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 301

An OSPF branch is intended to see only a default from its ABR. Which change should the network engineer prioritize?

  1. Configure a totally stubby area where supported.
  2. Account for OSPF's non-preemptive DR election.
  3. Set its OSPF interface priority to zero.
  4. Permit OSPF equal-cost multipath at the configured maximum-paths value.

Explanation

Correct Answer

A:

Totally stubby areas suppress most summary routes as well as external LSAs. The most direct remediation is configure a totally stubby area where supported. A practical acceptance test is the branch has an interarea default rather than hundreds of remote summaries. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: Two routers claim to be DR after priority changes but the original DR stays in office. Changing priority alone does not preempt an active DR on an existing segment. It does not specifically correct the issue here: an OSPF branch is intended to see only a default from its ABR.

C:

This choice addresses a different situation: An OSPF router must never become DR or BDR on a broadcast network. Priority zero makes the router ineligible for DR/BDR election. It does not specifically correct the issue here: an OSPF branch is intended to see only a default from its ABR.

D:

This choice addresses a different situation: Two equal-cost OSPF routes exist and traffic should use both. OSPF can install multiple next hops with equal computed metric. It does not specifically correct the issue here: an OSPF branch is intended to see only a default from its ABR.

Question 302

During acceptance testing after configure a totally stubby area where supported., which evidence is most relevant?

  1. The incumbent DR remains until the election is retriggered.
  2. The neighbor list shows it as a DROTHER during DR election.
  3. `show ip route ospf` lists both ECMP next hops for the destination.
  4. The branch has an interarea default rather than hundreds of remote summaries.

Explanation

Correct Answer

D:

The branch has an interarea default rather than hundreds of remote summaries. This is the targeted operational evidence for the change. Totally stubby areas suppress most summary routes as well as external LSAs. 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: Account for OSPF's non-preemptive DR election. Changing priority alone does not preempt an active DR on an existing segment. 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: Set its OSPF interface priority to zero. Priority zero makes the router ineligible for DR/BDR election. 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: 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.

Question 303

Two routers claim to be DR after priority changes but the original DR stays in office. Which remediation best resolves the described symptom?

  1. Set its interface OSPF priority appropriately before election.
  2. Check the DR/BDR topology and neighbor state rather than manually filtering LSAs.
  3. Account for OSPF's non-preemptive DR election.
  4. Adjust OSPF reference bandwidth consistently across the domain.

Explanation

Correct Answer

C:

Changing priority alone does not preempt an active DR on an existing segment. The most direct remediation is account for OSPF's non-preemptive DR election. A practical acceptance test is the incumbent DR remains until the election is retriggered. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: A network engineer wants a particular router elected DR on a shared Ethernet subnet. A higher priority (nonzero) gives a router DR election preference. It does not specifically correct the issue here: two routers claim to be DR after priority changes but the original DR stays in office.

B:

This choice addresses a different situation: A multiaccess OSPF network repeatedly floods updates through the wrong segment. Broadcast OSPF controls flooding with elected DR/BDR relationships. It does not specifically correct the issue here: two routers claim to be DR after priority changes but the original DR stays in office.

D:

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 routers claim to be DR after priority changes but the original DR stays in office.

Question 304

An operator has applied the following change: account for OSPF's non-preemptive DR election. Which observation best confirms it works?

  1. `show ip ospf neighbor` reports the intended DR after a new election.
  2. The incumbent DR remains until the election is retriggered.
  3. The segment shows one DR and one BDR and healthy adjacent peers.
  4. `show ip ospf interface` reports intended proportional interface costs.

Explanation

Correct Answer

B:

The incumbent DR remains until the election is retriggered. This is the targeted operational evidence for the change. Changing priority alone does not preempt an active DR on an existing segment. 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: Set its interface OSPF priority appropriately before election. A higher priority (nonzero) gives a router DR election preference. 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: Check the DR/BDR topology and neighbor state rather than manually filtering LSAs. Broadcast OSPF controls flooding with elected DR/BDR relationships. 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: 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.

Question 305

A network engineer wants a particular router elected DR on a shared Ethernet subnet. How should the team implement the required behavior?

  1. Set its interface OSPF priority appropriately before election.
  2. Set its OSPF interface priority to zero.
  3. Permit OSPF equal-cost multipath at the configured maximum-paths value.
  4. Inspect cumulative OSPF cost rather than counting hops.

Explanation

Correct Answer

A:

A higher priority (nonzero) gives a router DR election preference. The most direct remediation is set its interface OSPF priority appropriately before election. A practical acceptance test is `show ip ospf neighbor` reports the intended DR after a new election. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: An OSPF router must never become DR or BDR on a broadcast network. Priority zero makes the router ineligible for DR/BDR election. It does not specifically correct the issue here: a network engineer wants a particular router elected DR on a shared Ethernet subnet.

C:

This choice addresses a different situation: Two equal-cost OSPF routes exist and traffic should use both. OSPF can install multiple next hops with equal computed metric. It does not specifically correct the issue here: a network engineer wants a particular router elected DR on a shared Ethernet subnet.

D:

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 network engineer wants a particular router elected DR on a shared Ethernet subnet.

Question 306

After implementing set its interface OSPF priority appropriately before election., which operational evidence should an engineer collect?

  1. The neighbor list shows it as a DROTHER during DR election.
  2. `show ip route ospf` lists both ECMP next hops for the destination.
  3. The LSDB-derived lower-cost path appears as installed route.
  4. `show ip ospf neighbor` reports the intended DR after a new election.

Explanation

Correct Answer

D:

`show ip ospf neighbor` reports the intended DR after a new election. This is the targeted operational evidence for the change. A higher priority (nonzero) gives a router DR election preference. 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: Set its OSPF interface priority to zero. Priority zero makes the router ineligible for DR/BDR election. 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: 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.

C:

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.

Question 307

An OSPF router must never become DR or BDR on a broadcast network. What is the most appropriate corrective measure?

  1. Check the DR/BDR topology and neighbor state rather than manually filtering LSAs.
  2. Adjust OSPF reference bandwidth consistently across the domain.
  3. Set its OSPF interface priority to zero.
  4. Configure an OSPF area range summary at the ABR.

Explanation

Correct Answer

C:

Priority zero makes the router ineligible for DR/BDR election. The most direct remediation is set its OSPF interface priority to zero. A practical acceptance test is the neighbor list shows it as a DROTHER during DR election. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: A multiaccess OSPF network repeatedly floods updates through the wrong segment. Broadcast OSPF controls flooding with elected DR/BDR relationships. It does not specifically correct the issue here: an OSPF router must never become DR or BDR on a broadcast network.

B:

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: an OSPF router must never become DR or BDR on a broadcast network.

D:

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 router must never become DR or BDR on a broadcast network.

Question 308

The change request says: set its OSPF interface priority to zero. Which verification result is most decisive?

  1. The segment shows one DR and one BDR and healthy adjacent peers.
  2. The neighbor list shows it as a DROTHER during DR election.
  3. `show ip ospf interface` reports intended proportional interface costs.
  4. Area 0 routers see the intended aggregate rather than every child prefix.

Explanation

Correct Answer

B:

The neighbor list shows it as a DROTHER during DR election. This is the targeted operational evidence for the change. Priority zero makes the router ineligible for DR/BDR election. 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: Check the DR/BDR topology and neighbor state rather than manually filtering LSAs. Broadcast OSPF controls flooding with elected DR/BDR relationships. 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: 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.

D:

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.

Question 309

A multiaccess OSPF network repeatedly floods updates through the wrong segment. Which action most directly addresses this situation?

  1. Check the DR/BDR topology and neighbor state rather than manually filtering LSAs.
  2. Permit OSPF equal-cost multipath at the configured maximum-paths value.
  3. Inspect cumulative OSPF cost rather than counting hops.
  4. Use OSPF summary-address on the ASBR where supported.

Explanation

Correct Answer

A:

Broadcast OSPF controls flooding with elected DR/BDR relationships. The most direct remediation is check the DR/BDR topology and neighbor state rather than manually filtering LSAs. A practical acceptance test is the segment shows one DR and one BDR and healthy adjacent peers. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: Two equal-cost OSPF routes exist and traffic should use both. OSPF can install multiple next hops with equal computed metric. It does not specifically correct the issue here: a multiaccess OSPF network repeatedly floods updates through the wrong segment.

C:

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 multiaccess OSPF network repeatedly floods updates through the wrong segment.

D:

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 multiaccess OSPF network repeatedly floods updates through the wrong segment.

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.

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