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Question 610
A campus Wi-Fi client VLAN receives no leases after routing was introduced. What gateway service is likely missing?
- Configure correct DHCP relay on SVI
- Verify membership and packet counters
- Repair PIM and unicast RPF path
- Restore IGMP querier and membership
Explanation
Correct Answer
A:DHCP relay is required across subnet boundaries. Gateway relay forwards broadcasts to an authorized off-subnet server.
Incorrect Answers
B:Inspect IGMP/PIM group state and actual multicast flow after a fix. But this does not address the case requirement to send DHCP messages to the approved server.
C:Routed multicast depends on appropriate PIM adjacency and reverse-path reachability. But this does not address the case requirement to send DHCP messages to the approved server.
D:A querier or local membership mechanism maintains subscribers for snooped groups. But this does not address the case requirement to send DHCP messages to the approved server.
Question 611
Multicast joins work for a short time but periodically disappear. What network service should be checked?
- Configure correct DHCP relay on SVI
- Verify membership and packet counters
- Repair DHCP pool or offered options
- Restore IGMP querier and membership
Explanation
Correct Answer
D:IGMP query intervals and querier reachability affect retention. A querier or local membership mechanism maintains subscribers for snooped groups.
Incorrect Answers
A:Gateway relay forwards broadcasts to an authorized off-subnet server. But this does not address the case requirement to maintain active receiver memberships.
B:Inspect IGMP/PIM group state and actual multicast flow after a fix. But this does not address the case requirement to maintain active receiver memberships.
C:Scopes should provide available addresses, correct mask, gateway and resolver. But this does not address the case requirement to maintain active receiver memberships.
Question 612
The multicast tree is broken while ordinary ping to the source also fails. What should be restored first?
- Verify membership and packet counters
- Repair PIM and unicast RPF path
- Correct multicast router port
- Repair DHCP pool or offered options
Explanation
Correct Answer
B:RPF requires correct unicast source reachability. Routed multicast depends on appropriate PIM adjacency and reverse-path reachability.
Incorrect Answers
A:Inspect IGMP/PIM group state and actual multicast flow after a fix. But this does not address the case requirement to fix routing before revising multicast policy.
C:Switch snooping must forward toward the intended multicast router/uplink. But this does not address the case requirement to fix routing before revising multicast policy.
D:Scopes should provide available addresses, correct mask, gateway and resolver. But this does not address the case requirement to fix routing before revising multicast policy.
Question 613
A switch loses a VLAN after a recent template push and nobody knows which command changed. What should be done first?
- Monitor post-fix service indicators
- Coordinate maintenance and communications
- Compare applied config against known-good snapshot
- Use approved rollback or checkpoint
Explanation
Correct Answer
C:Compare current settings with a known-good configuration. A configuration diff isolates unexpected commands or missing settings after changes.
Incorrect Answers
A:Counters, route states, application health and alarms confirm recovery under real load. But this does not address the case requirement to identify the exact changed state.
B:Ownership, downtime windows and escalation govern disruptive recovery actions. But this does not address the case requirement to identify the exact changed state.
D:A tested restore can return a failed deployment to a stable baseline. But this does not address the case requirement to identify the exact changed state.
Question 614
A new switching release breaks routing and the documented rollback condition is met. What recovery process fits?
- Compare applied config against known-good snapshot
- Stage changes in representative test environment
- Use approved rollback or checkpoint
- Monitor post-fix service indicators
Explanation
Correct Answer
C:Restore the tested checkpoint or prior image according to plan. A tested restore can return a failed deployment to a stable baseline.
Incorrect Answers
A:A configuration diff isolates unexpected commands or missing settings after changes. But this does not address the case requirement to return to known-good service after failed rollout.
B:Nonproduction testing exposes functional regressions before affecting users. But this does not address the case requirement to return to known-good service after failed rollout.
D:Counters, route states, application health and alarms confirm recovery under real load. But this does not address the case requirement to return to known-good service after failed rollout.
Question 615
One VSX peer is upgraded to an incompatible build and state sync fails. What compatibility step is essential?
- Coordinate maintenance and communications
- Use approved rollback or checkpoint
- Monitor post-fix service indicators
- Validate supported firmware and peers
Explanation
Correct Answer
D:Restore supported paired releases and peer health. Check image compatibility, release notes and peer dependencies before proceeding.
Incorrect Answers
A:Ownership, downtime windows and escalation govern disruptive recovery actions. But this does not address the case requirement to resolve a software compatibility mismatch.
B:A tested restore can return a failed deployment to a stable baseline. But this does not address the case requirement to resolve a software compatibility mismatch.
C:Counters, route states, application health and alarms confirm recovery under real load. But this does not address the case requirement to resolve a software compatibility mismatch.
Question 616
An untested routing template must be pushed to all branches. What safer approach should precede fleet-wide deployment?
- Use approved rollback or checkpoint
- Stage changes in representative test environment
- Validate supported firmware and peers
- Monitor post-fix service indicators
Explanation
Correct Answer
B:Pilot the change in a representative environment. Nonproduction testing exposes functional regressions before affecting users.
Incorrect Answers
A:A tested restore can return a failed deployment to a stable baseline. But this does not address the case requirement to catch configuration incompatibility before broad impact.
C:Check image compatibility, release notes and peer dependencies before proceeding. But this does not address the case requirement to catch configuration incompatibility before broad impact.
D:Counters, route states, application health and alarms confirm recovery under real load. But this does not address the case requirement to catch configuration incompatibility before broad impact.
Question 617
A critical core reboot is proposed during payroll without notice or approval. What recovery governance is needed?
- Use approved rollback or checkpoint
- Stage changes in representative test environment
- Coordinate maintenance and communications
- Monitor post-fix service indicators
Explanation
Correct Answer
C:Use an approved window and stakeholder communications. Ownership, downtime windows and escalation govern disruptive recovery actions.
Incorrect Answers
A:A tested restore can return a failed deployment to a stable baseline. But this does not address the case requirement to coordinate a disruptive network change.
B:Nonproduction testing exposes functional regressions before affecting users. But this does not address the case requirement to coordinate a disruptive network change.
D:Counters, route states, application health and alarms confirm recovery under real load. But this does not address the case requirement to coordinate a disruptive network change.
Question 618
A link appears fixed but latency spikes recur every hour after the rollback. What should operations continue doing?
- Use approved rollback or checkpoint
- Validate supported firmware and peers
- Stage changes in representative test environment
- Monitor post-fix service indicators
Explanation
Correct Answer
D:Observe postchange counters and real application health. Counters, route states, application health and alarms confirm recovery under real load.
Incorrect Answers
A:A tested restore can return a failed deployment to a stable baseline. But this does not address the case requirement to verify sustained service restoration.
B:Check image compatibility, release notes and peer dependencies before proceeding. But this does not address the case requirement to verify sustained service restoration.
C:Nonproduction testing exposes functional regressions before affecting users. But this does not address the case requirement to verify sustained service restoration.
Question 619
A policy changed the port mode on several uplinks. What evidence can pinpoint the unintended lines?
- Coordinate maintenance and communications
- Compare applied config against known-good snapshot
- Monitor post-fix service indicators
- Validate supported firmware and peers
Explanation
Correct Answer
B:Compare with an archived configuration and approved diff. A configuration diff isolates unexpected commands or missing settings after changes.
Incorrect Answers
A:Ownership, downtime windows and escalation govern disruptive recovery actions. But this does not address the case requirement to isolate exact differences before a corrective edit.
C:Counters, route states, application health and alarms confirm recovery under real load. But this does not address the case requirement to isolate exact differences before a corrective edit.
D:Check image compatibility, release notes and peer dependencies before proceeding. But this does not address the case requirement to isolate exact differences before a corrective edit.
Question 620
A redundant routing pair shows errors after only one side received new firmware. What should be reviewed?
- Coordinate maintenance and communications
- Monitor post-fix service indicators
- Compare applied config against known-good snapshot
- Validate supported firmware and peers
Explanation
Correct Answer
D:Peer release compatibility and upgrade sequence are critical. Check image compatibility, release notes and peer dependencies before proceeding.
Incorrect Answers
A:Ownership, downtime windows and escalation govern disruptive recovery actions. But this does not address the case requirement to reestablish compatible running software.
B:Counters, route states, application health and alarms confirm recovery under real load. But this does not address the case requirement to reestablish compatible running software.
C:A configuration diff isolates unexpected commands or missing settings after changes. But this does not address the case requirement to reestablish compatible running software.
HPE Network Switching Professional (HPE7-A08) Practice Tests