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Implementing Cisco Enterprise Network Core Technologies (ENCOR) 350-401 Practice Test 27

Question 260

During acceptance testing after enable PortFast edge behavior only on real endpoint ports., which evidence is most relevant?

  1. Both switches display the same region config digest and instance mapping.
  2. The host port forwards immediately and loses edge state if appropriate BPDUs arrive.
  3. One port stays alternate for an instance and the intended path forwards.
  4. `show spanning-tree detail` shows the superior BPDU and chosen port role.

Explanation

Correct Answer

B:

The host port forwards immediately and loses edge state if appropriate BPDUs arrive. This is the targeted operational evidence for the change. Edge ports can transition rapidly when they do not connect a bridge. 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: Align MST name revision and VLAN-to-instance mapping across the region. MST region membership requires matching configuration digest information. 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: Change cost or topology per spanning-tree instance rather than forcing both paths forward. STP deliberately blocks redundant Layer-2 paths to avoid loops. 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 the full spanning-tree priority vector rather than local cost alone. STP compares root ID then path cost sender bridge ID and port IDs. 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 261

A campus uses MST but two switches place VLAN 20 in different MST instances. Which action most directly addresses this situation?

  1. Align MST name revision and VLAN-to-instance mapping across the region.
  2. Configure bridge priority for that specific MST instance.
  3. Configure genuine host ports as edge ports and investigate non-edge changes.
  4. Use RSTP or MST with correct edge and point-to-point link roles.

Explanation

Correct Answer

A:

MST region membership requires matching configuration digest information. The most direct remediation is align MST name revision and VLAN-to-instance mapping across the region. A practical acceptance test is both switches display the same region config digest and instance mapping. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: An MST instance uses an unintended root despite correct CIST root. MST permits distinct root selection per instance. It does not specifically correct the issue here: a campus uses MST but two switches place VLAN 20 in different MST instances.

C:

This choice addresses a different situation: A switch sees topology-change notifications after a workstation is plugged in. Proper edge treatment avoids unnecessary TCN propagation from host moves. It does not specifically correct the issue here: a campus uses MST but two switches place VLAN 20 in different MST instances.

D:

This choice addresses a different situation: A Layer-2 ring needs fast recovery and alternate path behavior. Rapid STP converges through proposal/agreement without old 802.1D timers on suitable links. It does not specifically correct the issue here: a campus uses MST but two switches place VLAN 20 in different MST instances.

Question 262

An operator has applied the following change: align MST name revision and VLAN-to-instance mapping across the region. Which observation best confirms it works?

  1. `show spanning-tree mst` reports the required root for that instance.
  2. STP topology-change counters no longer increment for ordinary host link flaps.
  3. Port roles transition to forwarding promptly during a tested link failure.
  4. Both switches display the same region config digest and instance mapping.

Explanation

Correct Answer

D:

Both switches display the same region config digest and instance mapping. This is the targeted operational evidence for the change. MST region membership requires matching configuration digest information. 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 bridge priority for that specific MST instance. MST permits distinct root selection per instance. 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: Configure genuine host ports as edge ports and investigate non-edge changes. Proper edge treatment avoids unnecessary TCN propagation from host moves. 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 RSTP or MST with correct edge and point-to-point link roles. Rapid STP converges through proposal/agreement without old 802.1D timers on suitable links. 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 263

An MST instance uses an unintended root despite correct CIST root. What is the most effective configuration or design response?

  1. Change cost or topology per spanning-tree instance rather than forcing both paths forward.
  2. Evaluate the full spanning-tree priority vector rather than local cost alone.
  3. Configure bridge priority for that specific MST instance.
  4. Add VLAN 30 to the allowed VLAN list on both sides.

Explanation

Correct Answer

C:

MST permits distinct root selection per instance. The most direct remediation is configure bridge priority for that specific MST instance. A practical acceptance test is `show spanning-tree mst` reports the required root for that instance. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: A redundant RSTP link remains an alternate port and engineers expect load sharing. STP deliberately blocks redundant Layer-2 paths to avoid loops. It does not specifically correct the issue here: an MST instance uses an unintended root despite correct CIST root.

B:

This choice addresses a different situation: An interface becomes designated despite a path with lower local port cost elsewhere. STP compares root ID then path cost sender bridge ID and port IDs. It does not specifically correct the issue here: an MST instance uses an unintended root despite correct CIST root.

D:

This choice addresses a different situation: An 802.1Q trunk carries VLAN 10 but not VLAN 30 after a maintenance change. An allowed-VLAN restriction stops the specified traffic on an otherwise operational trunk. It does not specifically correct the issue here: an MST instance uses an unintended root despite correct CIST root.

Question 264

After implementing configure bridge priority for that specific MST instance., which operational evidence should an engineer collect?

  1. One port stays alternate for an instance and the intended path forwards.
  2. `show spanning-tree mst` reports the required root for that instance.
  3. `show spanning-tree detail` shows the superior BPDU and chosen port role.
  4. `show interfaces trunk` lists VLAN 30 as allowed and active.

Explanation

Correct Answer

B:

`show spanning-tree mst` reports the required root for that instance. This is the targeted operational evidence for the change. MST permits distinct root selection per instance. 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: Change cost or topology per spanning-tree instance rather than forcing both paths forward. STP deliberately blocks redundant Layer-2 paths to avoid loops. 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: Evaluate the full spanning-tree priority vector rather than local cost alone. STP compares root ID then path cost sender bridge ID and port IDs. 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: Add VLAN 30 to the allowed VLAN list on both sides. An allowed-VLAN restriction stops the specified traffic on an otherwise operational trunk. 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 265

A redundant RSTP link remains an alternate port and engineers expect load sharing. Which change should the network engineer prioritize?

  1. Change cost or topology per spanning-tree instance rather than forcing both paths forward.
  2. Configure genuine host ports as edge ports and investigate non-edge changes.
  3. Use RSTP or MST with correct edge and point-to-point link roles.
  4. Set compatible trunk operational modes and verify DTP negotiation policy.

Explanation

Correct Answer

A:

STP deliberately blocks redundant Layer-2 paths to avoid loops. The most direct remediation is change cost or topology per spanning-tree instance rather than forcing both paths forward. A practical acceptance test is one port stays alternate for an instance and the intended path forwards. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: A switch sees topology-change notifications after a workstation is plugged in. Proper edge treatment avoids unnecessary TCN propagation from host moves. It does not specifically correct the issue here: a redundant RSTP link remains an alternate port and engineers expect load sharing.

C:

This choice addresses a different situation: A Layer-2 ring needs fast recovery and alternate path behavior. Rapid STP converges through proposal/agreement without old 802.1D timers on suitable links. It does not specifically correct the issue here: a redundant RSTP link remains an alternate port and engineers expect load sharing.

D:

This choice addresses a different situation: A switchport negotiates access mode although the upstream side expects tagged traffic. An access/trunk mismatch prevents the expected VLAN tagging behavior. It does not specifically correct the issue here: a redundant RSTP link remains an alternate port and engineers expect load sharing.

Question 266

The change request says: change cost or topology per spanning-tree instance rather than forcing both paths forward. Which verification result is most decisive?

  1. STP topology-change counters no longer increment for ordinary host link flaps.
  2. Port roles transition to forwarding promptly during a tested link failure.
  3. Both interfaces report trunking and tagged VLAN traffic passes.
  4. One port stays alternate for an instance and the intended path forwards.

Explanation

Correct Answer

D:

One port stays alternate for an instance and the intended path forwards. This is the targeted operational evidence for the change. STP deliberately blocks redundant Layer-2 paths to avoid loops. 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 genuine host ports as edge ports and investigate non-edge changes. Proper edge treatment avoids unnecessary TCN propagation from host moves. 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 RSTP or MST with correct edge and point-to-point link roles. Rapid STP converges through proposal/agreement without old 802.1D timers on suitable links. 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 compatible trunk operational modes and verify DTP negotiation policy. An access/trunk mismatch prevents the expected VLAN tagging 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 267

A switch sees topology-change notifications after a workstation is plugged in. Which remediation best resolves the described symptom?

  1. Evaluate the full spanning-tree priority vector rather than local cost alone.
  2. Add VLAN 30 to the allowed VLAN list on both sides.
  3. Configure genuine host ports as edge ports and investigate non-edge changes.
  4. Correct the native VLAN to match on both trunk endpoints.

Explanation

Correct Answer

C:

Proper edge treatment avoids unnecessary TCN propagation from host moves. The most direct remediation is configure genuine host ports as edge ports and investigate non-edge changes. A practical acceptance test is sTP topology-change counters no longer increment for ordinary host link flaps. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: An interface becomes designated despite a path with lower local port cost elsewhere. STP compares root ID then path cost sender bridge ID and port IDs. It does not specifically correct the issue here: a switch sees topology-change notifications after a workstation is plugged in.

B:

This choice addresses a different situation: An 802.1Q trunk carries VLAN 10 but not VLAN 30 after a maintenance change. An allowed-VLAN restriction stops the specified traffic on an otherwise operational trunk. It does not specifically correct the issue here: a switch sees topology-change notifications after a workstation is plugged in.

D:

This choice addresses a different situation: Two switches carry untagged traffic into different native VLANs. Mismatched native VLANs put untagged frames into unintended broadcast domains. It does not specifically correct the issue here: a switch sees topology-change notifications after a workstation is plugged in.

Question 268

A post-change test follows this action: configure genuine host ports as edge ports and investigate non-edge changes. Which result demonstrates success?

  1. `show spanning-tree detail` shows the superior BPDU and chosen port role.
  2. STP topology-change counters no longer increment for ordinary host link flaps.
  3. `show interfaces trunk` lists VLAN 30 as allowed and active.
  4. CDP warnings clear and both trunk ports show the same native VLAN.

Explanation

Correct Answer

B:

STP topology-change counters no longer increment for ordinary host link flaps. This is the targeted operational evidence for the change. Proper edge treatment avoids unnecessary TCN propagation from host moves. 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: Evaluate the full spanning-tree priority vector rather than local cost alone. STP compares root ID then path cost sender bridge ID and port IDs. 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: Add VLAN 30 to the allowed VLAN list on both sides. An allowed-VLAN restriction stops the specified traffic on an otherwise operational trunk. 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: Correct the native VLAN to match on both trunk endpoints. Mismatched native VLANs put untagged frames into unintended broadcast domains. 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 269

An interface becomes designated despite a path with lower local port cost elsewhere. How should the team implement the required behavior?

  1. Evaluate the full spanning-tree priority vector rather than local cost alone.
  2. Use RSTP or MST with correct edge and point-to-point link roles.
  3. Set compatible trunk operational modes and verify DTP negotiation policy.
  4. Force static trunk mode with consistent native and allowed VLAN settings on both ends.

Explanation

Correct Answer

A:

STP compares root ID then path cost sender bridge ID and port IDs. The most direct remediation is evaluate the full spanning-tree priority vector rather than local cost alone. A practical acceptance test is `show spanning-tree detail` shows the superior BPDU and chosen port role. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: A Layer-2 ring needs fast recovery and alternate path behavior. Rapid STP converges through proposal/agreement without old 802.1D timers on suitable links. It does not specifically correct the issue here: an interface becomes designated despite a path with lower local port cost elsewhere.

C:

This choice addresses a different situation: A switchport negotiates access mode although the upstream side expects tagged traffic. An access/trunk mismatch prevents the expected VLAN tagging behavior. It does not specifically correct the issue here: an interface becomes designated despite a path with lower local port cost elsewhere.

D:

This choice addresses a different situation: Two switches must form a tagged trunk even though one peer does not implement DTP. An explicitly configured 802.1Q trunk operates independently of dynamic trunk negotiation. It does not specifically correct the issue here: an interface becomes designated despite a path with lower local port cost elsewhere.

Question 270

During acceptance testing after evaluate the full spanning-tree priority vector rather than local cost alone., which evidence is most relevant?

  1. Port roles transition to forwarding promptly during a tested link failure.
  2. Both interfaces report trunking and tagged VLAN traffic passes.
  3. Both ports remain operational trunks and carry the approved tagged VLANs.
  4. `show spanning-tree detail` shows the superior BPDU and chosen port role.

Explanation

Correct Answer

D:

`show spanning-tree detail` shows the superior BPDU and chosen port role. This is the targeted operational evidence for the change. STP compares root ID then path cost sender bridge ID and port IDs. 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 RSTP or MST with correct edge and point-to-point link roles. Rapid STP converges through proposal/agreement without old 802.1D timers on suitable links. 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 compatible trunk operational modes and verify DTP negotiation policy. An access/trunk mismatch prevents the expected VLAN tagging 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.

C:

This observation validates another operation: Force static trunk mode with consistent native and allowed VLAN settings on both ends. An explicitly configured 802.1Q trunk operates independently of dynamic trunk negotiation. 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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