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Question 810
An operator changes an allowed VLAN on one VSX peer; sync alarms and data-path mismatches follow. What should be reconciled?
- Check VSX synchronization consistency
- Inspect multi-chassis LAG status
- Review VSX keepalive reachability
- Inspect VSX inter-switch link state
Explanation
Correct Answer
A:Compare effective synchronized peer settings to intended baseline. Some allowed configuration and state should synchronize between peers, and mismatches require precise comparison.
Incorrect Answers
B:VSX LAG members on each physical peer must be viable for dual-homed host forwarding. But this does not address the case requirement to resolve peer configuration divergence.
C:Keepalive supplies liveness signaling independent of the inter-switch link and helps handle split conditions. But this does not address the case requirement to resolve peer configuration divergence.
D:The inter-switch link carries coordination and peer data traffic required by the VSX design. But this does not address the case requirement to resolve peer configuration divergence.
Question 811
An unexpected access switch becomes spanning-tree root and redirects interbuilding traffic. Which state should be investigated?
- Inspect MSTP root bridge and region state
- Review blocked versus forwarding port roles
- Evaluate BPDU guard event status
- Inspect MAC address flapping evidence
Explanation
Correct Answer
A:The elected MSTP root and region settings determine the forwarding tree. Unexpected root selection or inconsistent MST region settings can change blocked and forwarding paths.
Incorrect Answers
B:A deliberately blocked alternate port can be normal when spanning tree prevents loops. But this does not address the case requirement to identify unplanned root bridge.
C:An edge port that sees a BPDU may be disabled intentionally by loop-protection policy. But this does not address the case requirement to identify unplanned root bridge.
D:Rapid movement of the same MAC between ports indicates unstable topology or incorrect wiring. But this does not address the case requirement to identify unplanned root bridge.
Question 812
MAC flushes happen every few seconds and MSTP topology changes rise sharply. What counter provides evidence?
- Inspect MSTP root bridge and region state
- Evaluate BPDU guard event status
- Correlate topology-change event rate
- Review blocked versus forwarding port roles
Explanation
Correct Answer
C:Frequent topology change events indicate bridge instability. Repeated MSTP changes trigger MAC relearning and often indicate an unstable loop or link.
Incorrect Answers
A:Unexpected root selection or inconsistent MST region settings can change blocked and forwarding paths. But this does not address the case requirement to interpret spanning-tree churn.
B:An edge port that sees a BPDU may be disabled intentionally by loop-protection policy. But this does not address the case requirement to interpret spanning-tree churn.
D:A deliberately blocked alternate port can be normal when spanning tree prevents loops. But this does not address the case requirement to interpret spanning-tree churn.
Question 813
A secondary redundant link is blocked by MSTP but primary connectivity is healthy. What operational conclusion fits?
- Check unknown unicast flood counters
- Evaluate BPDU guard event status
- Review blocked versus forwarding port roles
- Correlate topology-change event rate
Explanation
Correct Answer
C:A blocked alternate port can be the expected loop-avoidance state. A deliberately blocked alternate port can be normal when spanning tree prevents loops.
Incorrect Answers
A:High unknown-destination flooding may indicate failed MAC learning or frequent topology churn. But this does not address the case requirement to avoid treating safe blocking as a defect.
B:An edge port that sees a BPDU may be disabled intentionally by loop-protection policy. But this does not address the case requirement to avoid treating safe blocking as a defect.
D:Repeated MSTP changes trigger MAC relearning and often indicate an unstable loop or link. But this does not address the case requirement to avoid treating safe blocking as a defect.
Question 814
A server MAC appears alternately on two edge interfaces every few seconds. Which record is most relevant?
- Inspect MAC address flapping evidence
- Review blocked versus forwarding port roles
- Check unknown unicast flood counters
- Evaluate BPDU guard event status
Explanation
Correct Answer
A:MAC flapping indicates unstable source location. Rapid movement of the same MAC between ports indicates unstable topology or incorrect wiring.
Incorrect Answers
B:A deliberately blocked alternate port can be normal when spanning tree prevents loops. But this does not address the case requirement to identify L2 learning oscillation.
C:High unknown-destination flooding may indicate failed MAC learning or frequent topology churn. But this does not address the case requirement to identify L2 learning oscillation.
D:An edge port that sees a BPDU may be disabled intentionally by loop-protection policy. But this does not address the case requirement to identify L2 learning oscillation.
Question 815
The unknown-unicast packet rate becomes enormous after an FDB flush. What should operators examine?
- Inspect MAC address flapping evidence
- Inspect MSTP root bridge and region state
- Review blocked versus forwarding port roles
- Check unknown unicast flood counters
Explanation
Correct Answer
D:Excess unknown unicast flooding accompanies missing learned MAC entries. High unknown-destination flooding may indicate failed MAC learning or frequent topology churn.
Incorrect Answers
A:Rapid movement of the same MAC between ports indicates unstable topology or incorrect wiring. But this does not address the case requirement to diagnose flooding after churn.
B:Unexpected root selection or inconsistent MST region settings can change blocked and forwarding paths. But this does not address the case requirement to diagnose flooding after churn.
C:A deliberately blocked alternate port can be normal when spanning tree prevents loops. But this does not address the case requirement to diagnose flooding after churn.
Question 816
An edge port shuts immediately when someone adds a small Ethernet switch. The event log says BPDU guard. What policy acted?
- Inspect MSTP root bridge and region state
- Review blocked versus forwarding port roles
- Evaluate BPDU guard event status
- Check unknown unicast flood counters
Explanation
Correct Answer
C:BPDU guard stopped an unexpected bridge on a protected edge port. An edge port that sees a BPDU may be disabled intentionally by loop-protection policy.
Incorrect Answers
A:Unexpected root selection or inconsistent MST region settings can change blocked and forwarding paths. But this does not address the case requirement to identify loop-prevention shutdown.
B:A deliberately blocked alternate port can be normal when spanning tree prevents loops. But this does not address the case requirement to identify loop-prevention shutdown.
D:High unknown-destination flooding may indicate failed MAC learning or frequent topology churn. But this does not address the case requirement to identify loop-prevention shutdown.
Question 817
MSTP reports a lower-priority bridge as root than designed. Which configuration fact should be assessed?
- Evaluate BPDU guard event status
- Inspect MSTP root bridge and region state
- Correlate topology-change event rate
- Check unknown unicast flood counters
Explanation
Correct Answer
B:Review bridge priority and region consistency. Unexpected root selection or inconsistent MST region settings can change blocked and forwarding paths.
Incorrect Answers
A:An edge port that sees a BPDU may be disabled intentionally by loop-protection policy. But this does not address the case requirement to explain the unexpected spanning-tree root.
C:Repeated MSTP changes trigger MAC relearning and often indicate an unstable loop or link. But this does not address the case requirement to explain the unexpected spanning-tree root.
D:High unknown-destination flooding may indicate failed MAC learning or frequent topology churn. But this does not address the case requirement to explain the unexpected spanning-tree root.
Question 818
A redundant trunk shows blocking state with no user loss and stable root. What should the engineer report?
- Review blocked versus forwarding port roles
- Inspect MSTP root bridge and region state
- Correlate topology-change event rate
- Inspect MAC address flapping evidence
Explanation
Correct Answer
A:Blocking may be an intentional safe spanning-tree path state. A deliberately blocked alternate port can be normal when spanning tree prevents loops.
Incorrect Answers
B:Unexpected root selection or inconsistent MST region settings can change blocked and forwarding paths. But this does not address the case requirement to interpret expected port role.
C:Repeated MSTP changes trigger MAC relearning and often indicate an unstable loop or link. But this does not address the case requirement to interpret expected port role.
D:Rapid movement of the same MAC between ports indicates unstable topology or incorrect wiring. But this does not address the case requirement to interpret expected port role.
Question 819
Switch logs report thousands of MAC moves between two uplinks during a storm. Which issue is most apparent?
- Inspect MAC address flapping evidence
- Review blocked versus forwarding port roles
- Check unknown unicast flood counters
- Inspect MSTP root bridge and region state
Explanation
Correct Answer
A:A loop or unstable topology can drive repeated MAC location changes. Rapid movement of the same MAC between ports indicates unstable topology or incorrect wiring.
Incorrect Answers
B:A deliberately blocked alternate port can be normal when spanning tree prevents loops. But this does not address the case requirement to identify MAC flapping.
C:High unknown-destination flooding may indicate failed MAC learning or frequent topology churn. But this does not address the case requirement to identify MAC flapping.
D:Unexpected root selection or inconsistent MST region settings can change blocked and forwarding paths. But this does not address the case requirement to identify MAC flapping.
Question 820
A branch route disappears when an OSPF neighbor stays in Down state despite physical link up. Which operational output should be inspected?
- Review active route selection and metrics
- Inspect OSPF neighbor states and timers
- Evaluate route filtering and advertisements
- Confirm ARP and next-hop resolution
Explanation
Correct Answer
B:OSPF neighbor state and timers reveal adjacency failures. Adjacency state and hello/dead timer mismatches explain missing dynamic neighbor routes.
Incorrect Answers
A:The route table identifies the selected next hop and path preference for each destination. But this does not address the case requirement to identify missing routing neighbor.
C:A missing prefix may be denied or never advertised by routing-policy configuration. But this does not address the case requirement to identify missing routing neighbor.
D:Layer 3 routes depend on successful local adjacency to a reachable next-hop MAC. But this does not address the case requirement to identify missing routing neighbor.
HPE Network Switching Professional (HPE7-A08) Practice Tests
