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Question 480
Two cable pairs connect to different remote switches without VSX, but the local LAG expects one partner. What state mismatch explains failure?
- One physical member failure
- Partner system identity disagreement
- Minimum-links threshold not met
- LACP passive versus passive
Explanation
Correct Answer
B:The local ports see inconsistent LACP partner identities. Bundling requires compatible LACP system/port partner information and correct cabling.
Incorrect Answers
A:A LAG can remain up with reduced capacity when one member's carrier is lost. But this does not address the case requirement to detect incorrect cabling or aggregation endpoints.
C:An aggregate may intentionally stay down if too few links satisfy its minimum. But this does not address the case requirement to detect incorrect cabling or aggregation endpoints.
D:Two passive LACP endpoints do not initiate negotiation and may never create a bundle. But this does not address the case requirement to detect incorrect cabling or aggregation endpoints.
Question 481
A critical LAG has only one collecting member yet is configured to require two. Why is the logical interface down?
- LACP passive versus passive
- Minimum-links threshold not met
- One physical member failure
- Inconsistent member configuration
Explanation
Correct Answer
B:Minimum-links setting deliberately withdraws an undersized bundle. An aggregate may intentionally stay down if too few links satisfy its minimum.
Incorrect Answers
A:Two passive LACP endpoints do not initiate negotiation and may never create a bundle. But this does not address the case requirement to identify an unmet operational member threshold.
C:A LAG can remain up with reduced capacity when one member's carrier is lost. But this does not address the case requirement to identify an unmet operational member threshold.
D:LAG members with mismatched VLAN, speed, or supported policy settings may be suspended. But this does not address the case requirement to identify an unmet operational member threshold.
Question 482
One of four 10G members is down; the aggregate stays connected but peak throughput falls. What failure is evident?
- Inconsistent member configuration
- One physical member failure
- LACP partner not sending PDUs
- LACP passive versus passive
Explanation
Correct Answer
B:A single physical link has failed inside a still-working LAG. A LAG can remain up with reduced capacity when one member's carrier is lost.
Incorrect Answers
A:LAG members with mismatched VLAN, speed, or supported policy settings may be suspended. But this does not address the case requirement to identify capacity degradation from one member.
C:No expected LACP messages can indicate peer configuration or protocol path failure. But this does not address the case requirement to identify capacity degradation from one member.
D:Two passive LACP endpoints do not initiate negotiation and may never create a bundle. But this does not address the case requirement to identify capacity degradation from one member.
Question 483
The local LACP actor is active but no partner PDUs are received. What protocol symptom matters?
- Partner system identity disagreement
- Inconsistent member configuration
- LACP passive versus passive
- LACP partner not sending PDUs
Explanation
Correct Answer
D:An unresponsive peer prevents proper LACP exchange. No expected LACP messages can indicate peer configuration or protocol path failure.
Incorrect Answers
A:Bundling requires compatible LACP system/port partner information and correct cabling. But this does not address the case requirement to detect missing partner negotiation frames.
B:LAG members with mismatched VLAN, speed, or supported policy settings may be suspended. But this does not address the case requirement to detect missing partner negotiation frames.
C:Two passive LACP endpoints do not initiate negotiation and may never create a bundle. But this does not address the case requirement to detect missing partner negotiation frames.
Question 484
The LAG stops collecting after a technician changes VLAN tagging on only one member. What kind of failure occurred?
- LACP passive versus passive
- Inconsistent member configuration
- Minimum-links threshold not met
- Partner system identity disagreement
Explanation
Correct Answer
B:Nonuniform bundle configuration can suspend members. LAG members with mismatched VLAN, speed, or supported policy settings may be suspended.
Incorrect Answers
A:Two passive LACP endpoints do not initiate negotiation and may never create a bundle. But this does not address the case requirement to find a mismatched member policy.
C:An aggregate may intentionally stay down if too few links satisfy its minimum. But this does not address the case requirement to find a mismatched member policy.
D:Bundling requires compatible LACP system/port partner information and correct cabling. But this does not address the case requirement to find a mismatched member policy.
Question 485
A two-link LAG fails whenever either link breaks although one link can still carry traffic. What policy may explain the behavior?
- Minimum-links threshold not met
- LACP passive versus passive
- LACP partner not sending PDUs
- Partner system identity disagreement
Explanation
Correct Answer
A:Minimum-links two causes the LAG to shut with one member. An aggregate may intentionally stay down if too few links satisfy its minimum.
Incorrect Answers
B:Two passive LACP endpoints do not initiate negotiation and may never create a bundle. But this does not address the case requirement to interpret an explicit LAG threshold.
C:No expected LACP messages can indicate peer configuration or protocol path failure. But this does not address the case requirement to interpret an explicit LAG threshold.
D:Bundling requires compatible LACP system/port partner information and correct cabling. But this does not address the case requirement to interpret an explicit LAG threshold.
Question 486
One LACP member reports a different remote system ID than the rest. Which physical error should be suspected?
- LACP passive versus passive
- Minimum-links threshold not met
- Partner system identity disagreement
- LACP partner not sending PDUs
Explanation
Correct Answer
C:The member is connected to a different peer or misaggregated topology. Bundling requires compatible LACP system/port partner information and correct cabling.
Incorrect Answers
A:Two passive LACP endpoints do not initiate negotiation and may never create a bundle. But this does not address the case requirement to identify inconsistent LACP partner identity.
B:An aggregate may intentionally stay down if too few links satisfy its minimum. But this does not address the case requirement to identify inconsistent LACP partner identity.
D:No expected LACP messages can indicate peer configuration or protocol path failure. But this does not address the case requirement to identify inconsistent LACP partner identity.
Question 487
A newly installed access switch has unexpectedly become the STP root and paths changed campus-wide. What event occurred?
- BPDU guard shutdown
- Unexpected root bridge takeover
- Root guard blocking
- Topology change from unstable edge
Explanation
Correct Answer
B:Its bridge priority or ID displaced the intended root. An unplanned lower bridge ID can alter blocked/forwarding paths throughout the topology.
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 unexpected root election.
C:A designated protected boundary can block a superior BPDU that threatens root selection. But this does not address the case requirement to identify unexpected root election.
D:A flapping or unauthorized edge switch can produce repeated STP recalculations. But this does not address the case requirement to identify unexpected root election.
Question 488
Two distribution switches use identical VLANs but differing MSTP revision and mapping. What explains their region boundary?
- BPDU guard shutdown
- Topology change from unstable edge
- MSTP region mismatch
- Unexpected root bridge takeover
Explanation
Correct Answer
C:Inconsistent region parameters prevent shared MSTP region identification. Different region names, revisions or VLAN-instance mappings prevent intended common MSTP behavior.
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 find MSTP region mismatch.
B:A flapping or unauthorized edge switch can produce repeated STP recalculations. But this does not address the case requirement to find MSTP region mismatch.
D:An unplanned lower bridge ID can alter blocked/forwarding paths throughout the topology. But this does not address the case requirement to find MSTP region mismatch.
Question 489
A small desktop bridge is repeatedly connected and disconnected, creating rapid topology changes. What is the likely source?
- Topology change from unstable edge
- MSTP region mismatch
- BPDU guard shutdown
- Root guard blocking
Explanation
Correct Answer
A:Unstable edge bridging can trigger continual STP recalculation. A flapping or unauthorized edge switch can produce repeated STP recalculations.
Incorrect Answers
B:Different region names, revisions or VLAN-instance mappings prevent intended common MSTP behavior. But this does not address the case requirement to identify flapping bridge attachment.
C:An endpoint-facing protected port may be disabled after receiving an unexpected BPDU. But this does not address the case requirement to identify flapping bridge attachment.
D:A designated protected boundary can block a superior BPDU that threatens root selection. But this does not address the case requirement to identify flapping bridge attachment.
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.
HPE Network Switching Professional (HPE7-A08) Practice Tests