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Exam Name: Implementing Cisco Enterprise Network Core Technologies (ENCOR)
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Implementing Cisco Enterprise Network Core Technologies (ENCOR) 350-401 Practice Test 26

Question 250

During acceptance testing after lower the intended root switch's bridge priority for the affected VLAN/instance., which evidence is most relevant?

  1. When the primary fails the intended secondary becomes root.
  2. The port becomes err-disabled on BPDU receipt and logs identify BPDU guard.
  3. The host port forwards immediately and loses edge state if appropriate BPDUs arrive.
  4. `show spanning-tree` names the selected distribution bridge as root.

Explanation

Correct Answer

D:

`show spanning-tree` names the selected distribution bridge as root. This is the targeted operational evidence for the change. Root election uses the lowest bridge ID, including priority. 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 deliberate secondary root bridge priority. A preplanned backup root avoids arbitrary election after primary failure. 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 BPDU guard on the PortFast edge interface. BPDU guard disables a supposed host port that begins participating in spanning tree. 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 PortFast edge behavior only on real endpoint ports. Edge ports can transition rapidly when they do not connect a bridge. 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 251

A root bridge disappears and topology reconverges unexpectedly to a remote switch. What is the most effective configuration or design response?

  1. Enable root guard on the designated downstream interface.
  2. Use loop guard on suitable non-designated STP ports.
  3. Configure a deliberate secondary root bridge priority.
  4. Align MST name revision and VLAN-to-instance mapping across the region.

Explanation

Correct Answer

C:

A preplanned backup root avoids arbitrary election after primary failure. The most direct remediation is configure a deliberate secondary root bridge priority. A practical acceptance test is when the primary fails the intended secondary becomes root. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: An access switch suddenly receives superior BPDUs from an untrusted downstream port. Root guard prevents a downstream bridge from becoming the spanning-tree root. It does not specifically correct the issue here: a root bridge disappears and topology reconverges unexpectedly to a remote switch.

B:

This choice addresses a different situation: A trusted uplink misses BPDUs and starts forwarding along a one-way failure. Loop guard prevents blocked ports from incorrectly forwarding when BPDUs cease. It does not specifically correct the issue here: a root bridge disappears and topology reconverges unexpectedly to a remote switch.

D:

This choice addresses a different situation: A campus uses MST but two switches place VLAN 20 in different MST instances. MST region membership requires matching configuration digest information. It does not specifically correct the issue here: a root bridge disappears and topology reconverges unexpectedly to a remote switch.

Question 252

An operator has applied the following change: configure a deliberate secondary root bridge priority. Which observation best confirms it works?

  1. The interface shows root-inconsistent state when superior BPDUs arrive.
  2. When the primary fails the intended secondary becomes root.
  3. The port enters loop-inconsistent rather than unexpectedly forwarding.
  4. Both switches display the same region config digest and instance mapping.

Explanation

Correct Answer

B:

When the primary fails the intended secondary becomes root. This is the targeted operational evidence for the change. A preplanned backup root avoids arbitrary election after primary failure. 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: Enable root guard on the designated downstream interface. Root guard prevents a downstream bridge from becoming the spanning-tree root. 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 loop guard on suitable non-designated STP ports. Loop guard prevents blocked ports from incorrectly forwarding when BPDUs cease. 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: 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.

Question 253

An access switch suddenly receives superior BPDUs from an untrusted downstream port. Which change should the network engineer prioritize?

  1. Enable root guard on the designated downstream interface.
  2. Enable BPDU guard on the PortFast edge interface.
  3. Enable PortFast edge behavior only on real endpoint ports.
  4. Configure bridge priority for that specific MST instance.

Explanation

Correct Answer

A:

Root guard prevents a downstream bridge from becoming the spanning-tree root. The most direct remediation is enable root guard on the designated downstream interface. A practical acceptance test is the interface shows root-inconsistent state when superior BPDUs arrive. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: A user-facing PortFast interface receives a BPDU from an unmanaged switch. BPDU guard disables a supposed host port that begins participating in spanning tree. It does not specifically correct the issue here: an access switch suddenly receives superior BPDUs from an untrusted downstream port.

C:

This choice addresses a different situation: An RSTP edge interface is initially taking unnecessary convergence time. Edge ports can transition rapidly when they do not connect a bridge. It does not specifically correct the issue here: an access switch suddenly receives superior BPDUs from an untrusted downstream port.

D:

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: an access switch suddenly receives superior BPDUs from an untrusted downstream port.

Question 254

After implementing enable root guard on the designated downstream interface., which operational evidence should an engineer collect?

  1. The port becomes err-disabled on BPDU receipt and logs identify BPDU guard.
  2. The host port forwards immediately and loses edge state if appropriate BPDUs arrive.
  3. `show spanning-tree mst` reports the required root for that instance.
  4. The interface shows root-inconsistent state when superior BPDUs arrive.

Explanation

Correct Answer

D:

The interface shows root-inconsistent state when superior BPDUs arrive. This is the targeted operational evidence for the change. Root guard prevents a downstream bridge from becoming the spanning-tree root. 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: Enable BPDU guard on the PortFast edge interface. BPDU guard disables a supposed host port that begins participating in spanning tree. 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 PortFast edge behavior only on real endpoint ports. Edge ports can transition rapidly when they do not connect a bridge. 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 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.

Question 255

A user-facing PortFast interface receives a BPDU from an unmanaged switch. Which remediation best resolves the described symptom?

  1. Use loop guard on suitable non-designated STP ports.
  2. Align MST name revision and VLAN-to-instance mapping across the region.
  3. Enable BPDU guard on the PortFast edge interface.
  4. Change cost or topology per spanning-tree instance rather than forcing both paths forward.

Explanation

Correct Answer

C:

BPDU guard disables a supposed host port that begins participating in spanning tree. The most direct remediation is enable BPDU guard on the PortFast edge interface. A practical acceptance test is the port becomes err-disabled on BPDU receipt and logs identify BPDU guard. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: A trusted uplink misses BPDUs and starts forwarding along a one-way failure. Loop guard prevents blocked ports from incorrectly forwarding when BPDUs cease. It does not specifically correct the issue here: a user-facing PortFast interface receives a BPDU from an unmanaged switch.

B:

This choice addresses a different situation: A campus uses MST but two switches place VLAN 20 in different MST instances. MST region membership requires matching configuration digest information. It does not specifically correct the issue here: a user-facing PortFast interface receives a BPDU from an unmanaged switch.

D:

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: a user-facing PortFast interface receives a BPDU from an unmanaged switch.

Question 256

The change request says: enable BPDU guard on the PortFast edge interface. Which verification result is most decisive?

  1. The port enters loop-inconsistent rather than unexpectedly forwarding.
  2. The port becomes err-disabled on BPDU receipt and logs identify BPDU guard.
  3. Both switches display the same region config digest and instance mapping.
  4. One port stays alternate for an instance and the intended path forwards.

Explanation

Correct Answer

B:

The port becomes err-disabled on BPDU receipt and logs identify BPDU guard. This is the targeted operational evidence for the change. BPDU guard disables a supposed host port that begins participating in spanning tree. 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 loop guard on suitable non-designated STP ports. Loop guard prevents blocked ports from incorrectly forwarding when BPDUs cease. 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: 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.

D:

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.

Question 257

A trusted uplink misses BPDUs and starts forwarding along a one-way failure. How should the team implement the required behavior?

  1. Use loop guard on suitable non-designated STP ports.
  2. Enable PortFast edge behavior only on real endpoint ports.
  3. Configure bridge priority for that specific MST instance.
  4. Configure genuine host ports as edge ports and investigate non-edge changes.

Explanation

Correct Answer

A:

Loop guard prevents blocked ports from incorrectly forwarding when BPDUs cease. The most direct remediation is use loop guard on suitable non-designated STP ports. A practical acceptance test is the port enters loop-inconsistent rather than unexpectedly forwarding. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: An RSTP edge interface is initially taking unnecessary convergence time. Edge ports can transition rapidly when they do not connect a bridge. It does not specifically correct the issue here: a trusted uplink misses BPDUs and starts forwarding along a one-way failure.

C:

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 trusted uplink misses BPDUs and starts forwarding along a one-way failure.

D:

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 trusted uplink misses BPDUs and starts forwarding along a one-way failure.

Question 258

A post-change test follows this action: use loop guard on suitable non-designated STP ports. Which result demonstrates success?

  1. The host port forwards immediately and loses edge state if appropriate BPDUs arrive.
  2. `show spanning-tree mst` reports the required root for that instance.
  3. STP topology-change counters no longer increment for ordinary host link flaps.
  4. The port enters loop-inconsistent rather than unexpectedly forwarding.

Explanation

Correct Answer

D:

The port enters loop-inconsistent rather than unexpectedly forwarding. This is the targeted operational evidence for the change. Loop guard prevents blocked ports from incorrectly forwarding when BPDUs cease. 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: Enable PortFast edge behavior only on real endpoint ports. Edge ports can transition rapidly when they do not connect a bridge. 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 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.

C:

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.

Question 259

An RSTP edge interface is initially taking unnecessary convergence time. What is the most appropriate corrective measure?

  1. Align MST name revision and VLAN-to-instance mapping across the region.
  2. Change cost or topology per spanning-tree instance rather than forcing both paths forward.
  3. Enable PortFast edge behavior only on real endpoint ports.
  4. Evaluate the full spanning-tree priority vector rather than local cost alone.

Explanation

Correct Answer

C:

Edge ports can transition rapidly when they do not connect a bridge. The most direct remediation is enable PortFast edge behavior only on real endpoint ports. A practical acceptance test is the host port forwards immediately and loses edge state if appropriate BPDUs arrive. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: A campus uses MST but two switches place VLAN 20 in different MST instances. MST region membership requires matching configuration digest information. It does not specifically correct the issue here: an RSTP edge interface is initially taking unnecessary convergence time.

B:

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 RSTP edge interface is initially taking unnecessary convergence time.

D:

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 RSTP edge interface is initially taking unnecessary convergence time.

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.

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