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Question 830
IGMP memberships disappear predictably after their age timer while no querier is listed. What should be tested?
- Monitor multicast replication and port load
- Inspect IGMP snooping membership
- Check multicast TTL and group scope
- Check IGMP querier function and expiry
Explanation
Correct Answer
D:Querier participation maintains valid membership state. Without group queries the switch may age listener state and stop selective multicast distribution.
Incorrect Answers
A:Multicast trees can overload access ports or uplinks when content is replicated too widely. But this does not address the case requirement to diagnose group aging.
B:Per-VLAN group tables show which access ports have active receivers and should receive replicated frames. But this does not address the case requirement to diagnose group aging.
C:Source TTL or administrative scoping can intentionally prevent streams from crossing a routed boundary. But this does not address the case requirement to diagnose group aging.
Question 831
Receivers on the same VLAN work, but remote routed receivers do not; PIM neighbors are missing. What network function should be checked?
- Validate RPF incoming interface
- Review multicast routing and PIM neighbors
- Check multicast TTL and group scope
- Inspect IGMP snooping membership
Explanation
Correct Answer
B:Routed multicast depends on PIM/forwarding path establishment. Multicast receivers in routed VLANs need compatible L3 multicast path construction.
Incorrect Answers
A:A multicast packet can be rejected if it arrives on a path inconsistent with reverse source routing. But this does not address the case requirement to identify missing L3 group forwarding.
C:Source TTL or administrative scoping can intentionally prevent streams from crossing a routed boundary. But this does not address the case requirement to identify missing L3 group forwarding.
D:Per-VLAN group tables show which access ports have active receivers and should receive replicated frames. But this does not address the case requirement to identify missing L3 group forwarding.
Question 832
A multicast router drops packets on an unexpected incoming interface despite an active downstream group join. What check should be inspected?
- Check IGMP querier function and expiry
- Review multicast routing and PIM neighbors
- Monitor multicast replication and port load
- Validate RPF incoming interface
Explanation
Correct Answer
D:Reverse-path forwarding validates the expected source-facing interface. A multicast packet can be rejected if it arrives on a path inconsistent with reverse source routing.
Incorrect Answers
A:Without group queries the switch may age listener state and stop selective multicast distribution. But this does not address the case requirement to diagnose RPF mismatch.
B:Multicast receivers in routed VLANs need compatible L3 multicast path construction. But this does not address the case requirement to diagnose RPF mismatch.
C:Multicast trees can overload access ports or uplinks when content is replicated too widely. But this does not address the case requirement to diagnose RPF mismatch.
Question 833
A multicast feed causes saturation on access ports with no subscribed endpoints. Which telemetry matters?
- Validate RPF incoming interface
- Review multicast routing and PIM neighbors
- Check IGMP querier function and expiry
- Monitor multicast replication and port load
Explanation
Correct Answer
D:Observe multicast replication and port utilization to find excess forwarding. Multicast trees can overload access ports or uplinks when content is replicated too widely.
Incorrect Answers
A:A multicast packet can be rejected if it arrives on a path inconsistent with reverse source routing. But this does not address the case requirement to identify wasteful multicast traffic.
B:Multicast receivers in routed VLANs need compatible L3 multicast path construction. But this does not address the case requirement to identify wasteful multicast traffic.
C:Without group queries the switch may age listener state and stop selective multicast distribution. But this does not address the case requirement to identify wasteful multicast traffic.
Question 834
Video works locally but fails at the first routed hop; sender sets TTL 1. What source-side property explains it?
- Validate RPF incoming interface
- Check IGMP querier function and expiry
- Check multicast TTL and group scope
- Monitor multicast replication and port load
Explanation
Correct Answer
C:Packet TTL or multicast scope prevents traversal beyond the local network. Source TTL or administrative scoping can intentionally prevent streams from crossing a routed boundary.
Incorrect Answers
A:A multicast packet can be rejected if it arrives on a path inconsistent with reverse source routing. But this does not address the case requirement to identify TTL-limited multicast.
B:Without group queries the switch may age listener state and stop selective multicast distribution. But this does not address the case requirement to identify TTL-limited multicast.
D:Multicast trees can overload access ports or uplinks when content is replicated too widely. But this does not address the case requirement to identify TTL-limited multicast.
Question 835
The group membership table is empty while receivers report joining; traffic behavior is inconsistent. Where should the operator look?
- Validate RPF incoming interface
- Review multicast routing and PIM neighbors
- Inspect IGMP snooping membership
- Check IGMP querier function and expiry
Explanation
Correct Answer
C:IGMP snooping membership determines intended ports. Per-VLAN group tables show which access ports have active receivers and should receive replicated frames.
Incorrect Answers
A:A multicast packet can be rejected if it arrives on a path inconsistent with reverse source routing. But this does not address the case requirement to verify receiver state on the switch.
B:Multicast receivers in routed VLANs need compatible L3 multicast path construction. But this does not address the case requirement to verify receiver state on the switch.
D:Without group queries the switch may age listener state and stop selective multicast distribution. But this does not address the case requirement to verify receiver state on the switch.
Question 836
A multi-hop multicast feed stops when routing to the source changes and RPF drops rise. What operational check is decisive?
- Inspect IGMP snooping membership
- Check IGMP querier function and expiry
- Check multicast TTL and group scope
- Validate RPF incoming interface
Explanation
Correct Answer
D:Compare multicast RPF interface with the selected unicast source route. A multicast packet can be rejected if it arrives on a path inconsistent with reverse source routing.
Incorrect Answers
A:Per-VLAN group tables show which access ports have active receivers and should receive replicated frames. But this does not address the case requirement to identify source path mismatch.
B:Without group queries the switch may age listener state and stop selective multicast distribution. But this does not address the case requirement to identify source path mismatch.
C:Source TTL or administrative scoping can intentionally prevent streams from crossing a routed boundary. But this does not address the case requirement to identify source path mismatch.
Question 837
No active IGMP querier is detected after an SVI relocation and listener entries age out. What must be restored?
- Review multicast routing and PIM neighbors
- Check IGMP querier function and expiry
- Validate RPF incoming interface
- Check multicast TTL and group scope
Explanation
Correct Answer
B:Reestablish required querier and membership exchange. Without group queries the switch may age listener state and stop selective multicast distribution.
Incorrect Answers
A:Multicast receivers in routed VLANs need compatible L3 multicast path construction. But this does not address the case requirement to maintain snooping state.
C:A multicast packet can be rejected if it arrives on a path inconsistent with reverse source routing. But this does not address the case requirement to maintain snooping state.
D:Source TTL or administrative scoping can intentionally prevent streams from crossing a routed boundary. But this does not address the case requirement to maintain snooping state.
Question 838
A laptop link is up but its port remains unauthorized and EAP authentication fails. What session state should be checked?
- Check RADIUS request/response logs
- Inspect 802.1X supplicant and session state
- Check administrator authentication audit
- Inspect DHCP snooping violation events
Explanation
Correct Answer
B:802.1X negotiation and supplicant authorization are separate from carrier state. Authentication may fail due to EAP negotiation, credential or authorization status independent of physical carrier.
Incorrect Answers
A:AAA server timeouts and policy rejects distinguish transport failure from an intentional denial. But this does not address the case requirement to identify port-access authentication failure.
C:Management AAA logs reveal who accessed the switch and whether privileged commands were authorized. But this does not address the case requirement to identify port-access authentication failure.
D:Unauthorized DHCP source or binding anomalies may be blocked by first-hop security. But this does not address the case requirement to identify port-access authentication failure.
Question 839
Wired devices spend 40 seconds requesting access and logs show RADIUS timeouts. Which external decision path should be inspected?
- Inspect DHCP snooping violation events
- Check administrator authentication audit
- Check RADIUS request/response logs
- Inspect 802.1X supplicant and session state
Explanation
Correct Answer
C:AAA request/response logs can locate delays or explicit rejects. AAA server timeouts and policy rejects distinguish transport failure from an intentional denial.
Incorrect Answers
A:Unauthorized DHCP source or binding anomalies may be blocked by first-hop security. But this does not address the case requirement to identify RADIUS service fault.
B:Management AAA logs reveal who accessed the switch and whether privileged commands were authorized. But this does not address the case requirement to identify RADIUS service fault.
D:Authentication may fail due to EAP negotiation, credential or authorization status independent of physical carrier. But this does not address the case requirement to identify RADIUS service fault.
Question 840
An employee authenticates but gets guest VLAN and cannot reach payroll. What output should be examined?
- Check administrator authentication audit
- Inspect 802.1X supplicant and session state
- Check RADIUS request/response logs
- Review dynamic role and VLAN mapping
Explanation
Correct Answer
D:The returned dynamic role or VLAN controls effective access. A successful login can still receive the wrong network role and restricted policy.
Incorrect Answers
A:Management AAA logs reveal who accessed the switch and whether privileged commands were authorized. But this does not address the case requirement to diagnose role mapping.
B:Authentication may fail due to EAP negotiation, credential or authorization status independent of physical carrier. But this does not address the case requirement to diagnose role mapping.
C:AAA server timeouts and policy rejects distinguish transport failure from an intentional denial. But this does not address the case requirement to diagnose role mapping.
HPE Network Switching Professional (HPE7-A08) Practice Tests
