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HP HPE7-A01 Practice Test 19

Question 180

A campus uplink stays in individual-port state because one switch uses LACP active while the other has aggregation disabled. The change fails acceptance. What is the safest targeted restoration action?

  1. Restore the approved bridge priorities and remove the misconfigured link if an unintended loop appears.
  2. Remove the unauthorized bridge and clear the guard-triggered port fault only after verifying proper edge policy.
  3. Restore the previously compatible channel parameters and isolate any link that would otherwise create parallel paths.
  4. Restore the last safe STP protection settings and isolate the suspect optical path until the one-way fault is removed.

Explanation

Correct Answer

C:

Restore the previously compatible channel parameters and isolate any link that would otherwise create parallel paths. LACP negotiation depends on both peers participating in a compatible aggregation; unrelated physical ports cannot safely imitate a bundled link. The focused rollback restores a known safe baseline before another change attempt. The decision applies to the described lacp mode compatibility situation.

Incorrect Answers

A:

Restore the approved bridge priorities and remove the misconfigured link if an unintended loop appears. This instead concerns spanning tree root and loop prevention. STP root placement is an explicit topology control; changing bridge priority can redirect paths even when all links remain physically up. It would not safely roll back the relevant failed change. The immediate problem concerns lacp mode compatibility.

B:

Remove the unauthorized bridge and clear the guard-triggered port fault only after verifying proper edge policy. This instead concerns bpdu guard on edge ports. BPDU guard protects edge ports from unintended switching devices; globally disabling it to recover one port increases loop risk. It would not safely roll back the relevant failed change. The immediate problem concerns lacp mode compatibility.

D:

Restore the last safe STP protection settings and isolate the suspect optical path until the one-way fault is removed. This instead concerns loop guard during bpdu loss. Loop guard addresses missed BPDUs on appropriate nonedge links so a broken control plane does not trigger unsafe forwarding. It would not safely roll back the relevant failed change. The immediate problem concerns lacp mode compatibility.

Question 181

A wiring closet's port channel displays one partner as nonparticipating after a vendor swap changed its negotiation mode. Before implementing a remedy, what should the engineer check first?

  1. Review spanning-tree root bridge IDs, priorities, path costs and instance membership.
  2. Review local and peer LACP mode, system IDs and member negotiation state.
  3. Review the access port's BPDU guard event, edge designation and the connected device's actual role.
  4. Review STP role, loss of BPDUs and any loop-inconsistent or unidirectional-link events.

Explanation

Correct Answer

B:

Review local and peer LACP mode, system IDs and member negotiation state. LACP negotiation depends on both peers participating in a compatible aggregation; unrelated physical ports cannot safely imitate a bundled link. The evidence check isolates the relevant prerequisite before a disruptive change. The decision applies to the described lacp mode compatibility situation.

Incorrect Answers

A:

Review spanning-tree root bridge IDs, priorities, path costs and instance membership. This instead concerns spanning tree root and loop prevention. STP root placement is an explicit topology control; changing bridge priority can redirect paths even when all links remain physically up. It does not isolate the cause of the stated incident. The immediate problem concerns lacp mode compatibility.

C:

Review the access port's BPDU guard event, edge designation and the connected device's actual role. This instead concerns bpdu guard on edge ports. BPDU guard protects edge ports from unintended switching devices; globally disabling it to recover one port increases loop risk. It does not isolate the cause of the stated incident. The immediate problem concerns lacp mode compatibility.

D:

Review STP role, loss of BPDUs and any loop-inconsistent or unidirectional-link events. This instead concerns loop guard during bpdu loss. Loop guard addresses missed BPDUs on appropriate nonedge links so a broken control plane does not trigger unsafe forwarding. It does not isolate the cause of the stated incident. The immediate problem concerns lacp mode compatibility.

Question 182

A wiring closet's port channel displays one partner as nonparticipating after a vendor swap changed its negotiation mode. After the root cause is confirmed, which narrowly scoped configuration action should be selected?

  1. Set up compatible LACP participation on both ends and bundle only links with matching attributes.
  2. Set up supported bridge priorities to place the intended core or distribution bridge as STP root for the affected instance.
  3. Keep edge BPDU guard for user-facing ports and move legitimate infrastructure bridges to appropriately managed uplinks.
  4. Enforce appropriate loop or unidirectional-link protection on susceptible network-facing ports instead of treating them as user edges.

Explanation

Correct Answer

A:

Set up compatible LACP participation on both ends and bundle only links with matching attributes. LACP negotiation depends on both peers participating in a compatible aggregation; unrelated physical ports cannot safely imitate a bundled link. The proposed configuration targets the stated dependency without broadening unrelated access. The decision applies to the described lacp mode compatibility situation.

Incorrect Answers

B:

Set up supported bridge priorities to place the intended core or distribution bridge as STP root for the affected instance. This instead concerns spanning tree root and loop prevention. STP root placement is an explicit topology control; changing bridge priority can redirect paths even when all links remain physically up. It would not implement the specifically required change. The immediate problem concerns lacp mode compatibility.

C:

Keep edge BPDU guard for user-facing ports and move legitimate infrastructure bridges to appropriately managed uplinks. This instead concerns bpdu guard on edge ports. BPDU guard protects edge ports from unintended switching devices; globally disabling it to recover one port increases loop risk. It would not implement the specifically required change. The immediate problem concerns lacp mode compatibility.

D:

Enforce appropriate loop or unidirectional-link protection on susceptible network-facing ports instead of treating them as user edges. This instead concerns loop guard during bpdu loss. Loop guard addresses missed BPDUs on appropriate nonedge links so a broken control plane does not trigger unsafe forwarding. It would not implement the specifically required change. The immediate problem concerns lacp mode compatibility.

Question 183

A wiring closet's port channel displays one partner as nonparticipating after a vendor swap changed its negotiation mode. The review requires TWO complementary actions: one diagnostic check and one controlled configuration remedy. Select TWO actions that together meet those requirements.

  1. Review spanning-tree root bridge IDs, priorities, path costs and instance membership.
  2. Review local and peer LACP mode, system IDs and member negotiation state.
  3. Keep edge BPDU guard for user-facing ports and move legitimate infrastructure bridges to appropriately managed uplinks.
  4. Set up compatible LACP participation on both ends and bundle only links with matching attributes.

Explanation

Correct Answers

B:

Review local and peer LACP mode, system IDs and member negotiation state. LACP negotiation depends on both peers participating in a compatible aggregation; unrelated physical ports cannot safely imitate a bundled link. This is the required diagnosis or controlled remedy; the other keyed action supplies the complementary role. The decision applies to the described lacp mode compatibility situation.

D:

Set up compatible LACP participation on both ends and bundle only links with matching attributes. LACP negotiation depends on both peers participating in a compatible aggregation; unrelated physical ports cannot safely imitate a bundled link. This is the required diagnosis or controlled remedy; the other keyed action supplies the complementary role. The decision applies to the described lacp mode compatibility situation.

Incorrect Answers

A:

Review spanning-tree root bridge IDs, priorities, path costs and instance membership. This instead concerns spanning tree root and loop prevention. STP root placement is an explicit topology control; changing bridge priority can redirect paths even when all links remain physically up. It is not one of the requested paired diagnosis and configuration actions. The immediate problem concerns lacp mode compatibility.

C:

Keep edge BPDU guard for user-facing ports and move legitimate infrastructure bridges to appropriately managed uplinks. This instead concerns bpdu guard on edge ports. BPDU guard protects edge ports from unintended switching devices; globally disabling it to recover one port increases loop risk. It is not one of the requested paired diagnosis and configuration actions. The immediate problem concerns lacp mode compatibility.

Question 184

A wiring closet's port channel displays one partner as nonparticipating after a vendor swap changed its negotiation mode. If the revised setting disrupts users, which controlled rollback would be most relevant?

  1. Reinstate the approved bridge priorities and remove the misconfigured link if an unintended loop appears.
  2. Eliminate the unauthorized bridge and clear the guard-triggered port fault only after verifying proper edge policy.
  3. Reinstate the previously compatible channel parameters and isolate any link that would otherwise create parallel paths.
  4. Reinstate the last safe STP protection settings and isolate the suspect optical path until the one-way fault is removed.

Explanation

Correct Answer

C:

Reinstate the previously compatible channel parameters and isolate any link that would otherwise create parallel paths. LACP negotiation depends on both peers participating in a compatible aggregation; unrelated physical ports cannot safely imitate a bundled link. The focused rollback restores a known safe baseline before another change attempt. The decision applies to the described lacp mode compatibility situation.

Incorrect Answers

A:

Reinstate the approved bridge priorities and remove the misconfigured link if an unintended loop appears. This instead concerns spanning tree root and loop prevention. STP root placement is an explicit topology control; changing bridge priority can redirect paths even when all links remain physically up. It would not safely roll back the relevant failed change. The immediate problem concerns lacp mode compatibility.

B:

Eliminate the unauthorized bridge and clear the guard-triggered port fault only after verifying proper edge policy. This instead concerns bpdu guard on edge ports. BPDU guard protects edge ports from unintended switching devices; globally disabling it to recover one port increases loop risk. It would not safely roll back the relevant failed change. The immediate problem concerns lacp mode compatibility.

D:

Reinstate the last safe STP protection settings and isolate the suspect optical path until the one-way fault is removed. This instead concerns loop guard during bpdu loss. Loop guard addresses missed BPDUs on appropriate nonedge links so a broken control plane does not trigger unsafe forwarding. It would not safely roll back the relevant failed change. The immediate problem concerns lacp mode compatibility.

Question 185

A replacement distribution switch with a lower bridge ID becomes STP root unexpectedly and sends campus traffic over an undersized uplink. Which investigation would best isolate the immediate network dependency?

  1. Inspect the access port's BPDU guard event, edge designation and the connected device's actual role.
  2. Inspect STP role, loss of BPDUs and any loop-inconsistent or unidirectional-link events.
  3. Inspect spanning-tree root bridge IDs, priorities, path costs and instance membership.
  4. Inspect dynamic MAC table age, VLAN context, MAC moves and source-port learning on the affected switches.

Explanation

Correct Answer

C:

Inspect spanning-tree root bridge IDs, priorities, path costs and instance membership. STP root placement is an explicit topology control; changing bridge priority can redirect paths even when all links remain physically up. The evidence check isolates the relevant prerequisite before a disruptive change. The decision applies to the described spanning tree root and loop prevention situation.

Incorrect Answers

A:

Inspect the access port's BPDU guard event, edge designation and the connected device's actual role. This instead concerns bpdu guard on edge ports. BPDU guard protects edge ports from unintended switching devices; globally disabling it to recover one port increases loop risk. It does not isolate the cause of the stated incident. The immediate problem concerns spanning tree root and loop prevention.

B:

Inspect STP role, loss of BPDUs and any loop-inconsistent or unidirectional-link events. This instead concerns loop guard during bpdu loss. Loop guard addresses missed BPDUs on appropriate nonedge links so a broken control plane does not trigger unsafe forwarding. It does not isolate the cause of the stated incident. The immediate problem concerns spanning tree root and loop prevention.

D:

Inspect dynamic MAC table age, VLAN context, MAC moves and source-port learning on the affected switches. This instead concerns mac address learning and movement. Ethernet switches forward based on per-VLAN learned MAC locations; stale or rapidly moving entries can misdirect otherwise valid frames. It does not isolate the cause of the stated incident. The immediate problem concerns spanning tree root and loop prevention.

Question 186

A replacement distribution switch with a lower bridge ID becomes STP root unexpectedly and sends campus traffic over an undersized uplink. Which specific corrective design step best meets the stated campus requirement?

  1. Retain edge BPDU guard for user-facing ports and move legitimate infrastructure bridges to appropriately managed uplinks.
  2. Configure supported bridge priorities to place the intended core or distribution bridge as STP root for the affected instance.
  3. Apply appropriate loop or unidirectional-link protection on susceptible network-facing ports instead of treating them as user edges.
  4. Correct the unwanted Layer 2 forwarding path or mobility condition and let normal address learning converge.

Explanation

Correct Answer

B:

Configure supported bridge priorities to place the intended core or distribution bridge as STP root for the affected instance. STP root placement is an explicit topology control; changing bridge priority can redirect paths even when all links remain physically up. The proposed configuration targets the stated dependency without broadening unrelated access. The decision applies to the described spanning tree root and loop prevention situation.

Incorrect Answers

A:

Retain edge BPDU guard for user-facing ports and move legitimate infrastructure bridges to appropriately managed uplinks. This instead concerns bpdu guard on edge ports. BPDU guard protects edge ports from unintended switching devices; globally disabling it to recover one port increases loop risk. It would not implement the specifically required change. The immediate problem concerns spanning tree root and loop prevention.

C:

Apply appropriate loop or unidirectional-link protection on susceptible network-facing ports instead of treating them as user edges. This instead concerns loop guard during bpdu loss. Loop guard addresses missed BPDUs on appropriate nonedge links so a broken control plane does not trigger unsafe forwarding. It would not implement the specifically required change. The immediate problem concerns spanning tree root and loop prevention.

D:

Correct the unwanted Layer 2 forwarding path or mobility condition and let normal address learning converge. This instead concerns mac address learning and movement. Ethernet switches forward based on per-VLAN learned MAC locations; stale or rapidly moving entries can misdirect otherwise valid frames. It would not implement the specifically required change. The immediate problem concerns spanning tree root and loop prevention.

Question 187

A replacement distribution switch with a lower bridge ID becomes STP root unexpectedly and sends campus traffic over an undersized uplink. Following a targeted change, which acceptance test would most directly demonstrate success?

  1. Verify stable root identity, forwarding and blocking states and lower topology-change event counts.
  2. Validate the edge port rejects the unexpected bridge while authorized end devices reconnect normally.
  3. Verify the faulted path remains safely blocked and converges correctly when valid BPDUs return.
  4. Verify the correct VLAN and ingress port appear in MAC tables while frames reach the actual device.

Explanation

Correct Answer

A:

Verify stable root identity, forwarding and blocking states and lower topology-change event counts. STP root placement is an explicit topology control; changing bridge priority can redirect paths even when all links remain physically up. The result tests actual working behavior, not merely a saved configuration. The decision applies to the described spanning tree root and loop prevention situation.

Incorrect Answers

B:

Validate the edge port rejects the unexpected bridge while authorized end devices reconnect normally. This instead concerns bpdu guard on edge ports. BPDU guard protects edge ports from unintended switching devices; globally disabling it to recover one port increases loop risk. It would not establish that this function actually works. The immediate problem concerns spanning tree root and loop prevention.

C:

Verify the faulted path remains safely blocked and converges correctly when valid BPDUs return. This instead concerns loop guard during bpdu loss. Loop guard addresses missed BPDUs on appropriate nonedge links so a broken control plane does not trigger unsafe forwarding. It would not establish that this function actually works. The immediate problem concerns spanning tree root and loop prevention.

D:

Verify the correct VLAN and ingress port appear in MAC tables while frames reach the actual device. This instead concerns mac address learning and movement. Ethernet switches forward based on per-VLAN learned MAC locations; stale or rapidly moving entries can misdirect otherwise valid frames. It would not establish that this function actually works. The immediate problem concerns spanning tree root and loop prevention.

Question 188

A replacement distribution switch with a lower bridge ID becomes STP root unexpectedly and sends campus traffic over an undersized uplink. The change fails acceptance. What is the safest targeted restoration action?

  1. Remove the unauthorized bridge and clear the guard-triggered port fault only after verifying proper edge policy.
  2. Restore the last safe STP protection settings and isolate the suspect optical path until the one-way fault is removed.
  3. Restore the former forwarding path and clear only affected stale dynamic entries if controlled remediation requires it.
  4. Restore the approved bridge priorities and remove the misconfigured link if an unintended loop appears.

Explanation

Correct Answer

D:

Restore the approved bridge priorities and remove the misconfigured link if an unintended loop appears. STP root placement is an explicit topology control; changing bridge priority can redirect paths even when all links remain physically up. The focused rollback restores a known safe baseline before another change attempt. The decision applies to the described spanning tree root and loop prevention situation.

Incorrect Answers

A:

Remove the unauthorized bridge and clear the guard-triggered port fault only after verifying proper edge policy. This instead concerns bpdu guard on edge ports. BPDU guard protects edge ports from unintended switching devices; globally disabling it to recover one port increases loop risk. It would not safely roll back the relevant failed change. The immediate problem concerns spanning tree root and loop prevention.

B:

Restore the last safe STP protection settings and isolate the suspect optical path until the one-way fault is removed. This instead concerns loop guard during bpdu loss. Loop guard addresses missed BPDUs on appropriate nonedge links so a broken control plane does not trigger unsafe forwarding. It would not safely roll back the relevant failed change. The immediate problem concerns spanning tree root and loop prevention.

C:

Restore the former forwarding path and clear only affected stale dynamic entries if controlled remediation requires it. This instead concerns mac address learning and movement. Ethernet switches forward based on per-VLAN learned MAC locations; stale or rapidly moving entries can misdirect otherwise valid frames. It would not safely roll back the relevant failed change. The immediate problem concerns spanning tree root and loop prevention.

Question 189

A building network suffers topology changes after a newly added switch wins root election in the wrong MST instance. Before implementing a remedy, what should the engineer check first?

  1. Review the access port's BPDU guard event, edge designation and the connected device's actual role.
  2. Review STP role, loss of BPDUs and any loop-inconsistent or unidirectional-link events.
  3. Review spanning-tree root bridge IDs, priorities, path costs and instance membership.
  4. Review dynamic MAC table age, VLAN context, MAC moves and source-port learning on the affected switches.

Explanation

Correct Answer

C:

Review spanning-tree root bridge IDs, priorities, path costs and instance membership. STP root placement is an explicit topology control; changing bridge priority can redirect paths even when all links remain physically up. The evidence check isolates the relevant prerequisite before a disruptive change. The decision applies to the described spanning tree root and loop prevention situation.

Incorrect Answers

A:

Review the access port's BPDU guard event, edge designation and the connected device's actual role. This instead concerns bpdu guard on edge ports. BPDU guard protects edge ports from unintended switching devices; globally disabling it to recover one port increases loop risk. It does not isolate the cause of the stated incident. The immediate problem concerns spanning tree root and loop prevention.

B:

Review STP role, loss of BPDUs and any loop-inconsistent or unidirectional-link events. This instead concerns loop guard during bpdu loss. Loop guard addresses missed BPDUs on appropriate nonedge links so a broken control plane does not trigger unsafe forwarding. It does not isolate the cause of the stated incident. The immediate problem concerns spanning tree root and loop prevention.

D:

Review dynamic MAC table age, VLAN context, MAC moves and source-port learning on the affected switches. This instead concerns mac address learning and movement. Ethernet switches forward based on per-VLAN learned MAC locations; stale or rapidly moving entries can misdirect otherwise valid frames. It does not isolate the cause of the stated incident. The immediate problem concerns spanning tree root and loop prevention.

Question 190

A building network suffers topology changes after a newly added switch wins root election in the wrong MST instance. The review requires TWO complementary actions: one diagnostic check and one controlled configuration remedy. Select TWO actions that together meet those requirements.

  1. Review the access port's BPDU guard event, edge designation and the connected device's actual role.
  2. Review spanning-tree root bridge IDs, priorities, path costs and instance membership.
  3. Enforce appropriate loop or unidirectional-link protection on susceptible network-facing ports instead of treating them as user edges.
  4. Set up supported bridge priorities to place the intended core or distribution bridge as STP root for the affected instance.

Explanation

Correct Answers

B:

Review spanning-tree root bridge IDs, priorities, path costs and instance membership. STP root placement is an explicit topology control; changing bridge priority can redirect paths even when all links remain physically up. This is the required diagnosis or controlled remedy; the other keyed action supplies the complementary role. The decision applies to the described spanning tree root and loop prevention situation.

D:

Set up supported bridge priorities to place the intended core or distribution bridge as STP root for the affected instance. STP root placement is an explicit topology control; changing bridge priority can redirect paths even when all links remain physically up. This is the required diagnosis or controlled remedy; the other keyed action supplies the complementary role. The decision applies to the described spanning tree root and loop prevention situation.

Incorrect Answers

A:

Review the access port's BPDU guard event, edge designation and the connected device's actual role. This instead concerns bpdu guard on edge ports. BPDU guard protects edge ports from unintended switching devices; globally disabling it to recover one port increases loop risk. It is not one of the requested paired diagnosis and configuration actions. The immediate problem concerns spanning tree root and loop prevention.

C:

Enforce appropriate loop or unidirectional-link protection on susceptible network-facing ports instead of treating them as user edges. This instead concerns loop guard during bpdu loss. Loop guard addresses missed BPDUs on appropriate nonedge links so a broken control plane does not trigger unsafe forwarding. It is not one of the requested paired diagnosis and configuration actions. The immediate problem concerns spanning tree root and loop prevention.

HPE Network Campus Access Professional (HPE7-A01) Practice Tests