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HP HPE7-A01 Practice Test 21

Question 200

A room's access port unexpectedly shuts when a contractor attaches a bridge that advertises spanning-tree control frames. If the revised setting disrupts users, which controlled rollback would be most relevant?

  1. Eliminate the unauthorized bridge and clear the guard-triggered port fault only after verifying proper edge policy.
  2. Reinstate the last safe STP protection settings and isolate the suspect optical path until the one-way fault is removed.
  3. Reinstate the former forwarding path and clear only affected stale dynamic entries if controlled remediation requires it.
  4. Reinstate the prior secure profile and connect only the authorized endpoint while reviewing any needed exception.

Explanation

Correct Answer

A:

Eliminate the unauthorized bridge and clear the guard-triggered port fault only after verifying proper edge policy. BPDU guard protects edge ports from unintended switching devices; globally disabling it to recover one port increases loop risk. The focused rollback restores a known safe baseline before another change attempt. The decision applies to the described bpdu guard on edge ports situation.

Incorrect Answers

B:

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 bpdu guard on edge ports.

C:

Reinstate 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 bpdu guard on edge ports.

D:

Reinstate the prior secure profile and connect only the authorized endpoint while reviewing any needed exception. This instead concerns port-security mac limits. A MAC limit must reflect legitimate devices and threat policy; increasing it blindly can conceal an unauthorized downstream bridge. It would not safely roll back the relevant failed change. The immediate problem concerns bpdu guard on edge ports.

Question 201

A campus redundant uplink stops receiving expected BPDUs and the team fears a blocked port will begin forwarding into a loop. Which investigation would best isolate the immediate network dependency?

  1. Inspect STP role, loss of BPDUs and any loop-inconsistent or unidirectional-link events.
  2. Inspect dynamic MAC table age, VLAN context, MAC moves and source-port learning on the affected switches.
  3. Inspect secure MAC learning, violation counters and the required number of authorized devices on the port.
  4. Inspect VSX LAG interface configuration, peer synchronization and downstream LACP partner state.

Explanation

Correct Answer

A:

Inspect STP role, loss of BPDUs and any loop-inconsistent or unidirectional-link events. Loop guard addresses missed BPDUs on appropriate nonedge links so a broken control plane does not trigger unsafe forwarding. The evidence check isolates the relevant prerequisite before a disruptive change. The decision applies to the described loop guard during bpdu loss situation.

Incorrect Answers

B:

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 loop guard during bpdu loss.

C:

Inspect secure MAC learning, violation counters and the required number of authorized devices on the port. This instead concerns port-security mac limits. A MAC limit must reflect legitimate devices and threat policy; increasing it blindly can conceal an unauthorized downstream bridge. It does not isolate the cause of the stated incident. The immediate problem concerns loop guard during bpdu loss.

D:

Inspect VSX LAG interface configuration, peer synchronization and downstream LACP partner state. This instead concerns vsx multi-chassis lag. VSX LAG provides a coordinated logical bundle across two control planes; two independent plain LAGs are not a substitute. It does not isolate the cause of the stated incident. The immediate problem concerns loop guard during bpdu loss.

Question 202

A campus redundant uplink stops receiving expected BPDUs and the team fears a blocked port will begin forwarding into a loop. Which specific corrective design step best meets the stated campus requirement?

  1. Correct the unwanted Layer 2 forwarding path or mobility condition and let normal address learning converge.
  2. Set a justified port-security limit or approved access policy for the actual endpoint composition without permitting unbounded clients.
  3. Build the supported multichassis LAG consistently on VSX peers and the downstream switch according to the approved topology.
  4. Apply appropriate loop or unidirectional-link protection on susceptible network-facing ports instead of treating them as user edges.

Explanation

Correct Answer

D:

Apply appropriate loop or unidirectional-link protection on susceptible network-facing ports instead of treating them as user edges. Loop guard addresses missed BPDUs on appropriate nonedge links so a broken control plane does not trigger unsafe forwarding. The proposed configuration targets the stated dependency without broadening unrelated access. The decision applies to the described loop guard during bpdu loss situation.

Incorrect Answers

A:

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 loop guard during bpdu loss.

B:

Set a justified port-security limit or approved access policy for the actual endpoint composition without permitting unbounded clients. This instead concerns port-security mac limits. A MAC limit must reflect legitimate devices and threat policy; increasing it blindly can conceal an unauthorized downstream bridge. It would not implement the specifically required change. The immediate problem concerns loop guard during bpdu loss.

C:

Build the supported multichassis LAG consistently on VSX peers and the downstream switch according to the approved topology. This instead concerns vsx multi-chassis lag. VSX LAG provides a coordinated logical bundle across two control planes; two independent plain LAGs are not a substitute. It would not implement the specifically required change. The immediate problem concerns loop guard during bpdu loss.

Question 203

A campus redundant uplink stops receiving expected BPDUs and the team fears a blocked port will begin forwarding into a loop. Following a targeted change, which acceptance test would most directly demonstrate success?

  1. Verify the correct VLAN and ingress port appear in MAC tables while frames reach the actual device.
  2. Verify both intended endpoints learn securely and an additional unauthorized MAC still produces the designed violation.
  3. Verify the faulted path remains safely blocked and converges correctly when valid BPDUs return.
  4. Verify both paths join the same logical LAG and remain usable during a controlled failure of one VSX peer.

Explanation

Correct Answer

C:

Verify the faulted path remains safely blocked and converges correctly when valid BPDUs return. Loop guard addresses missed BPDUs on appropriate nonedge links so a broken control plane does not trigger unsafe forwarding. The result tests actual working behavior, not merely a saved configuration. The decision applies to the described loop guard during bpdu loss situation.

Incorrect Answers

A:

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 loop guard during bpdu loss.

B:

Verify both intended endpoints learn securely and an additional unauthorized MAC still produces the designed violation. This instead concerns port-security mac limits. A MAC limit must reflect legitimate devices and threat policy; increasing it blindly can conceal an unauthorized downstream bridge. It would not establish that this function actually works. The immediate problem concerns loop guard during bpdu loss.

D:

Verify both paths join the same logical LAG and remain usable during a controlled failure of one VSX peer. This instead concerns vsx multi-chassis lag. VSX LAG provides a coordinated logical bundle across two control planes; two independent plain LAGs are not a substitute. It would not establish that this function actually works. The immediate problem concerns loop guard during bpdu loss.

Question 204

A campus redundant uplink stops receiving expected BPDUs and the team fears a blocked port will begin forwarding into a loop. The change fails acceptance. What is the safest targeted restoration action?

  1. Restore the former forwarding path and clear only affected stale dynamic entries if controlled remediation requires it.
  2. Restore the last safe STP protection settings and isolate the suspect optical path until the one-way fault is removed.
  3. Restore the prior secure profile and connect only the authorized endpoint while reviewing any needed exception.
  4. Return the downstream connection to its last stable LACP design while repairing peer multichassis configuration.

Explanation

Correct Answer

B:

Restore the last safe STP protection settings and isolate the suspect optical path until the one-way fault is removed. Loop guard addresses missed BPDUs on appropriate nonedge links so a broken control plane does not trigger unsafe forwarding. The focused rollback restores a known safe baseline before another change attempt. The decision applies to the described loop guard during bpdu loss situation.

Incorrect Answers

A:

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 loop guard during bpdu loss.

C:

Restore the prior secure profile and connect only the authorized endpoint while reviewing any needed exception. This instead concerns port-security mac limits. A MAC limit must reflect legitimate devices and threat policy; increasing it blindly can conceal an unauthorized downstream bridge. It would not safely roll back the relevant failed change. The immediate problem concerns loop guard during bpdu loss.

D:

Return the downstream connection to its last stable LACP design while repairing peer multichassis configuration. This instead concerns vsx multi-chassis lag. VSX LAG provides a coordinated logical bundle across two control planes; two independent plain LAGs are not a substitute. It would not safely roll back the relevant failed change. The immediate problem concerns loop guard during bpdu loss.

Question 205

An optical one-way failure causes a non-designated switchport to lose spanning-tree information while still reporting carrier. Before implementing a remedy, what should the engineer check first?

  1. Review STP role, loss of BPDUs and any loop-inconsistent or unidirectional-link events.
  2. Review dynamic MAC table age, VLAN context, MAC moves and source-port learning on the affected switches.
  3. Review secure MAC learning, violation counters and the required number of authorized devices on the port.
  4. Review VSX LAG interface configuration, peer synchronization and downstream LACP partner state.

Explanation

Correct Answer

A:

Review STP role, loss of BPDUs and any loop-inconsistent or unidirectional-link events. Loop guard addresses missed BPDUs on appropriate nonedge links so a broken control plane does not trigger unsafe forwarding. The evidence check isolates the relevant prerequisite before a disruptive change. The decision applies to the described loop guard during bpdu loss situation.

Incorrect Answers

B:

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 loop guard during bpdu loss.

C:

Review secure MAC learning, violation counters and the required number of authorized devices on the port. This instead concerns port-security mac limits. A MAC limit must reflect legitimate devices and threat policy; increasing it blindly can conceal an unauthorized downstream bridge. It does not isolate the cause of the stated incident. The immediate problem concerns loop guard during bpdu loss.

D:

Review VSX LAG interface configuration, peer synchronization and downstream LACP partner state. This instead concerns vsx multi-chassis lag. VSX LAG provides a coordinated logical bundle across two control planes; two independent plain LAGs are not a substitute. It does not isolate the cause of the stated incident. The immediate problem concerns loop guard during bpdu loss.

Question 206

An optical one-way failure causes a non-designated switchport to lose spanning-tree information while still reporting carrier. After the root cause is confirmed, which narrowly scoped configuration action should be selected?

  1. Repair the unwanted Layer 2 forwarding path or mobility condition and let normal address learning converge.
  2. Apply a justified port-security limit or approved access policy for the actual endpoint composition without permitting unbounded clients.
  3. Create the supported multichassis LAG consistently on VSX peers and the downstream switch according to the approved topology.
  4. Enforce appropriate loop or unidirectional-link protection on susceptible network-facing ports instead of treating them as user edges.

Explanation

Correct Answer

D:

Enforce appropriate loop or unidirectional-link protection on susceptible network-facing ports instead of treating them as user edges. Loop guard addresses missed BPDUs on appropriate nonedge links so a broken control plane does not trigger unsafe forwarding. The proposed configuration targets the stated dependency without broadening unrelated access. The decision applies to the described loop guard during bpdu loss situation.

Incorrect Answers

A:

Repair 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 loop guard during bpdu loss.

B:

Apply a justified port-security limit or approved access policy for the actual endpoint composition without permitting unbounded clients. This instead concerns port-security mac limits. A MAC limit must reflect legitimate devices and threat policy; increasing it blindly can conceal an unauthorized downstream bridge. It would not implement the specifically required change. The immediate problem concerns loop guard during bpdu loss.

C:

Create the supported multichassis LAG consistently on VSX peers and the downstream switch according to the approved topology. This instead concerns vsx multi-chassis lag. VSX LAG provides a coordinated logical bundle across two control planes; two independent plain LAGs are not a substitute. It would not implement the specifically required change. The immediate problem concerns loop guard during bpdu loss.

Question 207

An optical one-way failure causes a non-designated switchport to lose spanning-tree information while still reporting carrier. A deployment job reports success. Which observed result would actually validate the affected service?

  1. Confirm the correct VLAN and ingress port appear in MAC tables while frames reach the actual device.
  2. Confirm both intended endpoints learn securely and an additional unauthorized MAC still produces the designed violation.
  3. Confirm the faulted path remains safely blocked and converges correctly when valid BPDUs return.
  4. Confirm both paths join the same logical LAG and remain usable during a controlled failure of one VSX peer.

Explanation

Correct Answer

C:

Confirm the faulted path remains safely blocked and converges correctly when valid BPDUs return. Loop guard addresses missed BPDUs on appropriate nonedge links so a broken control plane does not trigger unsafe forwarding. The result tests actual working behavior, not merely a saved configuration. The decision applies to the described loop guard during bpdu loss situation.

Incorrect Answers

A:

Confirm 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 loop guard during bpdu loss.

B:

Confirm both intended endpoints learn securely and an additional unauthorized MAC still produces the designed violation. This instead concerns port-security mac limits. A MAC limit must reflect legitimate devices and threat policy; increasing it blindly can conceal an unauthorized downstream bridge. It would not establish that this function actually works. The immediate problem concerns loop guard during bpdu loss.

D:

Confirm both paths join the same logical LAG and remain usable during a controlled failure of one VSX peer. This instead concerns vsx multi-chassis lag. VSX LAG provides a coordinated logical bundle across two control planes; two independent plain LAGs are not a substitute. It would not establish that this function actually works. The immediate problem concerns loop guard during bpdu loss.

Question 208

An optical one-way failure causes a non-designated switchport to lose spanning-tree information while still reporting carrier. The review requires TWO complementary actions: one diagnostic check and one controlled configuration remedy. Select TWO actions that together meet those requirements.

  1. Review dynamic MAC table age, VLAN context, MAC moves and source-port learning on the affected switches.
  2. Review STP role, loss of BPDUs and any loop-inconsistent or unidirectional-link events.
  3. Apply a justified port-security limit or approved access policy for the actual endpoint composition without permitting unbounded clients.
  4. Enforce appropriate loop or unidirectional-link protection on susceptible network-facing ports instead of treating them as user edges.

Explanation

Correct Answers

B:

Review STP role, loss of BPDUs and any loop-inconsistent or unidirectional-link events. Loop guard addresses missed BPDUs on appropriate nonedge links so a broken control plane does not trigger unsafe forwarding. This is the required diagnosis or controlled remedy; the other keyed action supplies the complementary role. The decision applies to the described loop guard during bpdu loss situation.

D:

Enforce appropriate loop or unidirectional-link protection on susceptible network-facing ports instead of treating them as user edges. Loop guard addresses missed BPDUs on appropriate nonedge links so a broken control plane does not trigger unsafe forwarding. This is the required diagnosis or controlled remedy; the other keyed action supplies the complementary role. The decision applies to the described loop guard during bpdu loss situation.

Incorrect Answers

A:

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 is not one of the requested paired diagnosis and configuration actions. The immediate problem concerns loop guard during bpdu loss.

C:

Apply a justified port-security limit or approved access policy for the actual endpoint composition without permitting unbounded clients. This instead concerns port-security mac limits. A MAC limit must reflect legitimate devices and threat policy; increasing it blindly can conceal an unauthorized downstream bridge. It is not one of the requested paired diagnosis and configuration actions. The immediate problem concerns loop guard during bpdu loss.

Question 209

A phone connects through a desk switch but the core MAC table keeps pointing its address to an obsolete uplink. Which investigation would best isolate the immediate network dependency?

  1. Inspect secure MAC learning, violation counters and the required number of authorized devices on the port.
  2. Inspect dynamic MAC table age, VLAN context, MAC moves and source-port learning on the affected switches.
  3. Inspect VSX LAG interface configuration, peer synchronization and downstream LACP partner state.
  4. Inspect snooping enabled VLANs, trusted-port assignment and DHCP offer source interfaces.

Explanation

Correct Answer

B:

Inspect dynamic MAC table age, VLAN context, MAC moves and source-port learning on the affected switches. Ethernet switches forward based on per-VLAN learned MAC locations; stale or rapidly moving entries can misdirect otherwise valid frames. The evidence check isolates the relevant prerequisite before a disruptive change. The decision applies to the described mac address learning and movement situation.

Incorrect Answers

A:

Inspect secure MAC learning, violation counters and the required number of authorized devices on the port. This instead concerns port-security mac limits. A MAC limit must reflect legitimate devices and threat policy; increasing it blindly can conceal an unauthorized downstream bridge. It does not isolate the cause of the stated incident. The immediate problem concerns mac address learning and movement.

C:

Inspect VSX LAG interface configuration, peer synchronization and downstream LACP partner state. This instead concerns vsx multi-chassis lag. VSX LAG provides a coordinated logical bundle across two control planes; two independent plain LAGs are not a substitute. It does not isolate the cause of the stated incident. The immediate problem concerns mac address learning and movement.

D:

Inspect snooping enabled VLANs, trusted-port assignment and DHCP offer source interfaces. This instead concerns dhcp snooping trust boundary. DHCP snooping relies on a precise trust boundary; trusting a client port permits unauthorized DHCP servers to inject offers. It does not isolate the cause of the stated incident. The immediate problem concerns mac address learning and movement.

Question 210

A phone connects through a desk switch but the core MAC table keeps pointing its address to an obsolete uplink. Which specific corrective design step best meets the stated campus requirement?

  1. Correct the unwanted Layer 2 forwarding path or mobility condition and let normal address learning converge.
  2. Set a justified port-security limit or approved access policy for the actual endpoint composition without permitting unbounded clients.
  3. Build the supported multichassis LAG consistently on VSX peers and the downstream switch according to the approved topology.
  4. Trust only legitimate server-facing paths while leaving user-facing ports untrusted under the supported snooping policy.

Explanation

Correct Answer

A:

Correct the unwanted Layer 2 forwarding path or mobility condition and let normal address learning converge. Ethernet switches forward based on per-VLAN learned MAC locations; stale or rapidly moving entries can misdirect otherwise valid frames. The proposed configuration targets the stated dependency without broadening unrelated access. The decision applies to the described mac address learning and movement situation.

Incorrect Answers

B:

Set a justified port-security limit or approved access policy for the actual endpoint composition without permitting unbounded clients. This instead concerns port-security mac limits. A MAC limit must reflect legitimate devices and threat policy; increasing it blindly can conceal an unauthorized downstream bridge. It would not implement the specifically required change. The immediate problem concerns mac address learning and movement.

C:

Build the supported multichassis LAG consistently on VSX peers and the downstream switch according to the approved topology. This instead concerns vsx multi-chassis lag. VSX LAG provides a coordinated logical bundle across two control planes; two independent plain LAGs are not a substitute. It would not implement the specifically required change. The immediate problem concerns mac address learning and movement.

D:

Trust only legitimate server-facing paths while leaving user-facing ports untrusted under the supported snooping policy. This instead concerns dhcp snooping trust boundary. DHCP snooping relies on a precise trust boundary; trusting a client port permits unauthorized DHCP servers to inject offers. It would not implement the specifically required change. The immediate problem concerns mac address learning and movement.

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