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Implementing Cisco Enterprise Network Core Technologies (ENCOR) 350-401 Practice Test 29

Question 280

A post-change test follows this action: set the OSPF interface network type to point-to-point where appropriate. Which result demonstrates success?

  1. Neighbor debug shows bidirectional hello recognition after correction.
  2. Both routers reach FULL and show point-to-point network type.
  3. `show ip ospf` reports unique RIDs and neighbor becomes stable.
  4. An O*E2 default appears only while the ASBR has the required default.

Explanation

Correct Answer

B:

Both routers reach FULL and show point-to-point network type. This is the targeted operational evidence for the change. Point-to-point OSPF forms a direct adjacency without DR or 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: Investigate one-way hello reachability and hello neighbor lists. INIT means a router sees hellos without seeing its own RID acknowledged. 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: Assign a unique router ID and restart the process as required. OSPF relies on unique router identifiers for its LSDB and adjacency. 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: Use conditional `default-information originate` behavior matching route presence. OSPF default origination without `always` depends on a usable default route. 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 281

Two routers exchange OSPF hellos but the neighbor remains INIT. How should the team implement the required behavior?

  1. Investigate one-way hello reachability and hello neighbor lists.
  2. Match hello/dead interval configuration on peers.
  3. Match OSPF authentication method and key identifiers across neighbors.
  4. Use explicit area assignments or precise wildcard masks to limit participating interfaces.

Explanation

Correct Answer

A:

INIT means a router sees hellos without seeing its own RID acknowledged. The most direct remediation is investigate one-way hello reachability and hello neighbor lists. A practical acceptance test is neighbor debug shows bidirectional hello recognition after correction. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: An OSPF adjacency flaps due to different hello and dead timers. OSPF neighbors require compatible hello/dead values. It does not specifically correct the issue here: two routers exchange OSPF hellos but the neighbor remains INIT.

C:

This choice addresses a different situation: An OSPF link is configured for MD5 authentication only on one side. Authentication mismatch causes hello packets to be rejected. It does not specifically correct the issue here: two routers exchange OSPF hellos but the neighbor remains INIT.

D:

This choice addresses a different situation: An OSPF network statement includes unintended loopback interfaces. Loose OSPF network matching can activate adjacency on wrong interfaces. It does not specifically correct the issue here: two routers exchange OSPF hellos but the neighbor remains INIT.

Question 282

During acceptance testing after investigate one-way hello reachability and hello neighbor lists., which evidence is most relevant?

  1. Both interfaces report matching timers and stable FULL adjacency.
  2. Neighbor reaches FULL and OSPF authentication failure counters stop.
  3. `show ip ospf interface brief` lists only intended routing interfaces.
  4. Neighbor debug shows bidirectional hello recognition after correction.

Explanation

Correct Answer

D:

Neighbor debug shows bidirectional hello recognition after correction. This is the targeted operational evidence for the change. INIT means a router sees hellos without seeing its own RID acknowledged. 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: Match hello/dead interval configuration on peers. OSPF neighbors require compatible hello/dead values. 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: Match OSPF authentication method and key identifiers across neighbors. Authentication mismatch causes hello packets to be rejected. 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 explicit area assignments or precise wildcard masks to limit participating interfaces. Loose OSPF network matching can activate adjacency on wrong interfaces. 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 283

An OSPF adjacency flaps due to different hello and dead timers. What is the most appropriate corrective measure?

  1. Assign a unique router ID and restart the process as required.
  2. Use conditional `default-information originate` behavior matching route presence.
  3. Match hello/dead interval configuration on peers.
  4. Configure that interface passive in OSPF.

Explanation

Correct Answer

C:

OSPF neighbors require compatible hello/dead values. The most direct remediation is match hello/dead interval configuration on peers. A practical acceptance test is both interfaces report matching timers and stable FULL adjacency. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: An OSPF router ID conflicts with a neighbor on the same domain. OSPF relies on unique router identifiers for its LSDB and adjacency. It does not specifically correct the issue here: an OSPF adjacency flaps due to different hello and dead timers.

B:

This choice addresses a different situation: A default route must be originated from the ASBR only while an external route exists. OSPF default origination without `always` depends on a usable default route. It does not specifically correct the issue here: an OSPF adjacency flaps due to different hello and dead timers.

D:

This choice addresses a different situation: A branch interface must advertise its subnet but must not form neighbors. Passive interfaces can advertise connected networks without sending OSPF hellos. It does not specifically correct the issue here: an OSPF adjacency flaps due to different hello and dead timers.

Question 284

An operator has applied the following change: match hello/dead interval configuration on peers. Which observation best confirms it works?

  1. `show ip ospf` reports unique RIDs and neighbor becomes stable.
  2. Both interfaces report matching timers and stable FULL adjacency.
  3. An O*E2 default appears only while the ASBR has the required default.
  4. The connected subnet appears in OSPF while no neighbor forms on the passive port.

Explanation

Correct Answer

B:

Both interfaces report matching timers and stable FULL adjacency. This is the targeted operational evidence for the change. OSPF neighbors require compatible hello/dead values. 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: Assign a unique router ID and restart the process as required. OSPF relies on unique router identifiers for its LSDB and adjacency. 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 conditional `default-information originate` behavior matching route presence. OSPF default origination without `always` depends on a usable default route. 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 that interface passive in OSPF. Passive interfaces can advertise connected networks without sending OSPF hellos. 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 285

An OSPF router ID conflicts with a neighbor on the same domain. Which action most directly addresses this situation?

  1. Assign a unique router ID and restart the process as required.
  2. Match OSPF authentication method and key identifiers across neighbors.
  3. Use explicit area assignments or precise wildcard masks to limit participating interfaces.
  4. Correct backbone connectivity and area assignment for the ABR.

Explanation

Correct Answer

A:

OSPF relies on unique router identifiers for its LSDB and adjacency. The most direct remediation is assign a unique router ID and restart the process as required. A practical acceptance test is `show ip ospf` reports unique RIDs and neighbor becomes stable. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: An OSPF link is configured for MD5 authentication only on one side. Authentication mismatch causes hello packets to be rejected. It does not specifically correct the issue here: an OSPF router ID conflicts with a neighbor on the same domain.

C:

This choice addresses a different situation: An OSPF network statement includes unintended loopback interfaces. Loose OSPF network matching can activate adjacency on wrong interfaces. It does not specifically correct the issue here: an OSPF router ID conflicts with a neighbor on the same domain.

D:

This choice addresses a different situation: A multiarea OSPF router puts a transit interface into area 1 rather than backbone area 0. Interarea OSPF normally requires a contiguous area 0 backbone. It does not specifically correct the issue here: an OSPF router ID conflicts with a neighbor on the same domain.

Question 286

After implementing assign a unique router ID and restart the process as required., which operational evidence should an engineer collect?

  1. Neighbor reaches FULL and OSPF authentication failure counters stop.
  2. `show ip ospf interface brief` lists only intended routing interfaces.
  3. `show ip ospf interface` shows the correct area and interarea routes return.
  4. `show ip ospf` reports unique RIDs and neighbor becomes stable.

Explanation

Correct Answer

D:

`show ip ospf` reports unique RIDs and neighbor becomes stable. This is the targeted operational evidence for the change. OSPF relies on unique router identifiers for its LSDB and adjacency. 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: Match OSPF authentication method and key identifiers across neighbors. Authentication mismatch causes hello packets to be rejected. 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 explicit area assignments or precise wildcard masks to limit participating interfaces. Loose OSPF network matching can activate adjacency on wrong interfaces. 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: Correct backbone connectivity and area assignment for the ABR. Interarea OSPF normally requires a contiguous area 0 backbone. 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 287

An OSPF link is configured for MD5 authentication only on one side. What is the most effective configuration or design response?

  1. Use conditional `default-information originate` behavior matching route presence.
  2. Configure that interface passive in OSPF.
  3. Match OSPF authentication method and key identifiers across neighbors.
  4. Check the stub area type and use an appropriate non-stub area if external LSAs are needed.

Explanation

Correct Answer

C:

Authentication mismatch causes hello packets to be rejected. The most direct remediation is match OSPF authentication method and key identifiers across neighbors. A practical acceptance test is neighbor reaches FULL and OSPF authentication failure counters stop. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: A default route must be originated from the ASBR only while an external route exists. OSPF default origination without `always` depends on a usable default route. It does not specifically correct the issue here: an OSPF link is configured for MD5 authentication only on one side.

B:

This choice addresses a different situation: A branch interface must advertise its subnet but must not form neighbors. Passive interfaces can advertise connected networks without sending OSPF hellos. It does not specifically correct the issue here: an OSPF link is configured for MD5 authentication only on one side.

D:

This choice addresses a different situation: An area 2 router cannot learn any external type-5 LSAs and has a stub flag. Stub areas intentionally suppress external LSAs. It does not specifically correct the issue here: an OSPF link is configured for MD5 authentication only on one side.

Question 288

The change request says: match OSPF authentication method and key identifiers across neighbors. Which verification result is most decisive?

  1. An O*E2 default appears only while the ASBR has the required default.
  2. Neighbor reaches FULL and OSPF authentication failure counters stop.
  3. The connected subnet appears in OSPF while no neighbor forms on the passive port.
  4. After removing stub constraints, permitted external LSAs appear in the LSDB.

Explanation

Correct Answer

B:

Neighbor reaches FULL and OSPF authentication failure counters stop. This is the targeted operational evidence for the change. Authentication mismatch causes hello packets to be rejected. 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 conditional `default-information originate` behavior matching route presence. OSPF default origination without `always` depends on a usable default route. 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 that interface passive in OSPF. Passive interfaces can advertise connected networks without sending OSPF hellos. 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 stub area type and use an appropriate non-stub area if external LSAs are needed. Stub areas intentionally suppress 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.

Question 289

A default route must be originated from the ASBR only while an external route exists. Which change should the network engineer prioritize?

  1. Use conditional `default-information originate` behavior matching route presence.
  2. Use explicit area assignments or precise wildcard masks to limit participating interfaces.
  3. Correct backbone connectivity and area assignment for the ABR.
  4. Configure area NSSA consistently on its routers.

Explanation

Correct Answer

A:

OSPF default origination without `always` depends on a usable default route. The most direct remediation is use conditional `default-information originate` behavior matching route presence. A practical acceptance test is an O*E2 default appears only while the ASBR has the required default. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: An OSPF network statement includes unintended loopback interfaces. Loose OSPF network matching can activate adjacency on wrong interfaces. It does not specifically correct the issue here: a default route must be originated from the ASBR only while an external route exists.

C:

This choice addresses a different situation: A multiarea OSPF router puts a transit interface into area 1 rather than backbone area 0. Interarea OSPF normally requires a contiguous area 0 backbone. It does not specifically correct the issue here: a default route must be originated from the ASBR only while an external route exists.

D:

This choice addresses a different situation: An OSPF NSSA must inject external routes without importing all external LSAs. An NSSA uses type-7 LSAs for locally redistributed routes. It does not specifically correct the issue here: a default route must be originated from the ASBR only while an external route exists.

Question 290

A post-change test follows this action: use conditional `default-information originate` behavior matching route presence. Which result demonstrates success?

  1. `show ip ospf interface brief` lists only intended routing interfaces.
  2. `show ip ospf interface` shows the correct area and interarea routes return.
  3. The NSSA database contains local type-7 advertisements and ABR translation as applicable.
  4. An O*E2 default appears only while the ASBR has the required default.

Explanation

Correct Answer

D:

An O*E2 default appears only while the ASBR has the required default. This is the targeted operational evidence for the change. OSPF default origination without `always` depends on a usable default route. 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 explicit area assignments or precise wildcard masks to limit participating interfaces. Loose OSPF network matching can activate adjacency on wrong interfaces. 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: Correct backbone connectivity and area assignment for the ABR. Interarea OSPF normally requires a contiguous area 0 backbone. 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 area NSSA consistently on its routers. An NSSA uses type-7 LSAs for locally redistributed routes. 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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