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Question 490
A protected user access interface goes into an error state immediately after receiving BPDUs. What feature explains the action?
- Topology change from unstable edge
- Root guard blocking
- BPDU guard shutdown
- Unexpected root bridge takeover
Explanation
Correct Answer
C:BPDU guard protects an edge port from unintended bridge connections. An endpoint-facing protected port may be disabled after receiving an unexpected BPDU.
Incorrect Answers
A:A flapping or unauthorized edge switch can produce repeated STP recalculations. But this does not address the case requirement to identify edge port protection shutdown.
B:A designated protected boundary can block a superior BPDU that threatens root selection. But this does not address the case requirement to identify edge port protection shutdown.
D:An unplanned lower bridge ID can alter blocked/forwarding paths throughout the topology. But this does not address the case requirement to identify edge port protection shutdown.
Question 491
A tenant bridge advertises a superior root BPDU into an interface configured with root guard, which starts blocking. Why?
- BPDU guard shutdown
- Root guard blocking
- Unexpected root bridge takeover
- MSTP region mismatch
Explanation
Correct Answer
B:Root guard protects the designated boundary from root takeover. A designated protected boundary can block a superior BPDU that threatens root selection.
Incorrect Answers
A:An endpoint-facing protected port may be disabled after receiving an unexpected BPDU. But this does not address the case requirement to identify intentional superior-BPDU blocking.
C:An unplanned lower bridge ID can alter blocked/forwarding paths throughout the topology. But this does not address the case requirement to identify intentional superior-BPDU blocking.
D:Different region names, revisions or VLAN-instance mappings prevent intended common MSTP behavior. But this does not address the case requirement to identify intentional superior-BPDU blocking.
Question 492
A campus suddenly floods enormous unknown unicast and broadcast traffic after two edge ports were patched together. What likely happened?
- Root guard blocking
- Broadcast storm from a loop
- MSTP region mismatch
- BPDU guard shutdown
Explanation
Correct Answer
B:A Layer 2 loop replicates flooded frames. A physical bridging loop can amplify flooded frames and consume link resources.
Incorrect Answers
A:A designated protected boundary can block a superior BPDU that threatens root selection. But this does not address the case requirement to recognize a bridged loop or broadcast storm.
C:Different region names, revisions or VLAN-instance mappings prevent intended common MSTP behavior. But this does not address the case requirement to recognize a bridged loop or broadcast storm.
D:An endpoint-facing protected port may be disabled after receiving an unexpected BPDU. But this does not address the case requirement to recognize a bridged loop or broadcast storm.
Question 493
Two switches claim different MSTP region digests despite the same configured name. What likely differs?
- Broadcast storm from a loop
- MSTP region mismatch
- BPDU guard shutdown
- Root guard blocking
Explanation
Correct Answer
B:VLAN mappings or revision can still be inconsistent. Different region names, revisions or VLAN-instance mappings prevent intended common MSTP behavior.
Incorrect Answers
A:A physical bridging loop can amplify flooded frames and consume link resources. But this does not address the case requirement to diagnose MST region mismatch beyond name.
C:An endpoint-facing protected port may be disabled after receiving an unexpected BPDU. But this does not address the case requirement to diagnose MST region mismatch beyond name.
D:A designated protected boundary can block a superior BPDU that threatens root selection. But this does not address the case requirement to diagnose MST region mismatch beyond name.
Question 494
A user adds a miniature unmanaged switch and their port shuts after STP frames arrive. What protection was triggered?
- Root guard blocking
- BPDU guard shutdown
- Unexpected root bridge takeover
- Broadcast storm from a loop
Explanation
Correct Answer
B:BPDU guard rejects unexpected bridge control frames on the edge. An endpoint-facing protected port may be disabled after receiving an unexpected BPDU.
Incorrect Answers
A:A designated protected boundary can block a superior BPDU that threatens root selection. But this does not address the case requirement to explain automatic protective port shutdown.
C:An unplanned lower bridge ID can alter blocked/forwarding paths throughout the topology. But this does not address the case requirement to explain automatic protective port shutdown.
D:A physical bridging loop can amplify flooded frames and consume link resources. But this does not address the case requirement to explain automatic protective port shutdown.
Question 495
CPU rises sharply while broadcast frames circulate between two access switches without a blocked path. What failure class fits?
- Unexpected root bridge takeover
- Topology change from unstable edge
- Broadcast storm from a loop
- MSTP region mismatch
Explanation
Correct Answer
C:A Layer 2 loop generates runaway flooded traffic. A physical bridging loop can amplify flooded frames and consume link resources.
Incorrect Answers
A:An unplanned lower bridge ID can alter blocked/forwarding paths throughout the topology. But this does not address the case requirement to identify a broadcast storm cause.
B:A flapping or unauthorized edge switch can produce repeated STP recalculations. But this does not address the case requirement to identify a broadcast storm cause.
D:Different region names, revisions or VLAN-instance mappings prevent intended common MSTP behavior. But this does not address the case requirement to identify a broadcast storm cause.
Question 496
A two-member VSF stack loses its only intermember Ethernet link and one member disappears. Which failure is likely?
- Member numbering or cabling mismatch
- VSF unsupported member combination
- VSF link failure
- Downstream uplink concentrated on failed member
Explanation
Correct Answer
C:The VSF connectivity path between members has failed. An intermember VSF link interruption may remove or partition members depending on topology.
Incorrect Answers
A:Incorrect VSF member IDs/links can stop intended stack formation. But this does not address the case requirement to identify intermember stack-link loss.
B:An incompatible switch model or release cannot join a given stack configuration. But this does not address the case requirement to identify intermember stack-link loss.
D:A stack can be healthy on surviving members yet lose all upstream links if physically concentrated. But this does not address the case requirement to identify intermember stack-link loss.
Question 497
A new 6300 device is expected to stack with 6200 members even though their matrix forbids mixing. What explains rejection?
- Member numbering or cabling mismatch
- Commander or standby role disruption
- VSF unsupported member combination
- VSF ring redundancy lost
Explanation
Correct Answer
C:The proposed member family combination is unsupported. An incompatible switch model or release cannot join a given stack configuration.
Incorrect Answers
A:Incorrect VSF member IDs/links can stop intended stack formation. But this does not address the case requirement to identify VSF hardware incompatibility.
B:A control-role failure triggers supported VSF leadership change and transient convergence. But this does not address the case requirement to identify VSF hardware incompatibility.
D:A ring broken into a chain may stay operational but lose single-link resilience. But this does not address the case requirement to identify VSF hardware incompatibility.
Question 498
After a commander power loss, the standby member takes control following reconvergence. What event caused management interruption?
- Commander or standby role disruption
- VSF unsupported member combination
- Member numbering or cabling mismatch
- VSF link failure
Explanation
Correct Answer
A:The active VSF control role failed. A control-role failure triggers supported VSF leadership change and transient convergence.
Incorrect Answers
B:An incompatible switch model or release cannot join a given stack configuration. But this does not address the case requirement to understand expected commander failover.
C:Incorrect VSF member IDs/links can stop intended stack formation. But this does not address the case requirement to understand expected commander failover.
D:An intermember VSF link interruption may remove or partition members depending on topology. But this does not address the case requirement to understand expected commander failover.
Question 499
A three-member ring still works after one VSF cable fails but now has no alternate ring path. What protection is lost?
- VSF link failure
- Downstream uplink concentrated on failed member
- VSF ring redundancy lost
- Member numbering or cabling mismatch
Explanation
Correct Answer
C:The remaining stack is a chain without the original link redundancy. A ring broken into a chain may stay operational but lose single-link resilience.
Incorrect Answers
A:An intermember VSF link interruption may remove or partition members depending on topology. But this does not address the case requirement to identify reduced ring resilience.
B:A stack can be healthy on surviving members yet lose all upstream links if physically concentrated. But this does not address the case requirement to identify reduced ring resilience.
D:Incorrect VSF member IDs/links can stop intended stack formation. But this does not address the case requirement to identify reduced ring resilience.
Question 500
All upstream uplinks were on one member that lost power; remaining VSF members still forward local ports but cannot reach core. What design failure is revealed?
- VSF link failure
- VSF ring redundancy lost
- Downstream uplink concentrated on failed member
- Member numbering or cabling mismatch
Explanation
Correct Answer
C:Uplink failure domain was concentrated on one physical member. A stack can be healthy on surviving members yet lose all upstream links if physically concentrated.
Incorrect Answers
A:An intermember VSF link interruption may remove or partition members depending on topology. But this does not address the case requirement to locate lost aggregation connectivity.
B:A ring broken into a chain may stay operational but lose single-link resilience. But this does not address the case requirement to locate lost aggregation connectivity.
D:Incorrect VSF member IDs/links can stop intended stack formation. But this does not address the case requirement to locate lost aggregation connectivity.
HPE Network Switching Professional (HPE7-A08) Practice Tests