HP HPE7-A01 Practice Test 26
Question 250
A campus IPTV service floods all access ports because the switches do not track multicast listener membership. Which specific corrective design step best meets the stated campus requirement?
- Set compatible MTU on each required link and routed path while respecting device and application limits.
- Enable compatible IGMP snooping with a reachable querier and approved multicast groups for the affected segment.
- Create or restore the authorized routed VLAN interface and its routing or ACL context, keeping access ports Layer 2.
- Permit the approved tagged VLAN IDs on both ends and set compatible native or untagged VLAN handling.
Explanation
Correct Answer
B:Enable compatible IGMP snooping with a reachable querier and approved multicast groups for the affected segment. IGMP snooping constrains multicast delivery based on reported listeners, and a querier maintains membership state over time. The proposed configuration targets the stated dependency without broadening unrelated access. The decision applies to the described igmp snooping multicast membership situation.
Incorrect Answers
A:Set compatible MTU on each required link and routed path while respecting device and application limits. This instead concerns mtu mismatch in a campus path. A single low-MTU hop can disrupt large packets even while small connectivity probes succeed; end-to-end sizing matters. It would not implement the specifically required change. The immediate problem concerns igmp snooping multicast membership.
C:Create or restore the authorized routed VLAN interface and its routing or ACL context, keeping access ports Layer 2. This instead concerns svi versus layer 2 access interface. A Layer 2 VLAN groups frames, whereas an SVI provides an IP routing interface; one does not automatically create the other. It would not implement the specifically required change. The immediate problem concerns igmp snooping multicast membership.
D:Permit the approved tagged VLAN IDs on both ends and set compatible native or untagged VLAN handling. This instead concerns vlan tagging on an 802.1q trunk. An IEEE 802.1Q trunk carries multiple VLANs by tags; permitted VLAN membership and native-tag treatment must agree across the link. It would not implement the specifically required change. The immediate problem concerns igmp snooping multicast membership.
Question 251
A campus IPTV service floods all access ports because the switches do not track multicast listener membership. Following a targeted change, which acceptance test would most directly demonstrate success?
- Verify only subscribed receiver ports receive the test stream while membership survives the query interval.
- Test payloads near the intended path size and confirm large frames pass without fragmentation-related loss.
- Verify same-VLAN switching and permitted cross-VLAN routing through the intended SVI without unexpected leakage.
- Capture tagged test frames and verify each client VLAN reaches only its intended gateway.
Explanation
Correct Answer
A:Verify only subscribed receiver ports receive the test stream while membership survives the query interval. IGMP snooping constrains multicast delivery based on reported listeners, and a querier maintains membership state over time. The result tests actual working behavior, not merely a saved configuration. The decision applies to the described igmp snooping multicast membership situation.
Incorrect Answers
B:Test payloads near the intended path size and confirm large frames pass without fragmentation-related loss. This instead concerns mtu mismatch in a campus path. A single low-MTU hop can disrupt large packets even while small connectivity probes succeed; end-to-end sizing matters. It would not establish that this function actually works. The immediate problem concerns igmp snooping multicast membership.
C:Verify same-VLAN switching and permitted cross-VLAN routing through the intended SVI without unexpected leakage. This instead concerns svi versus layer 2 access interface. A Layer 2 VLAN groups frames, whereas an SVI provides an IP routing interface; one does not automatically create the other. It would not establish that this function actually works. The immediate problem concerns igmp snooping multicast membership.
D:Capture tagged test frames and verify each client VLAN reaches only its intended gateway. This instead concerns vlan tagging on an 802.1q trunk. An IEEE 802.1Q trunk carries multiple VLANs by tags; permitted VLAN membership and native-tag treatment must agree across the link. It would not establish that this function actually works. The immediate problem concerns igmp snooping multicast membership.
Question 252
A campus IPTV service floods all access ports because the switches do not track multicast listener membership. The change fails acceptance. What is the safest targeted restoration action?
- Restore the previously working end-to-end MTU and revert the isolated change if large traffic still fails.
- Restore the last valid SVI address and routing policy to reestablish gateway functionality before retrying migration.
- Restore the last correct trunk allowed list and matching tag configuration before reopening the affected VLAN.
- Restore a working querier and last known multicast forwarding configuration to recover legitimate receivers.
Explanation
Correct Answer
D:Restore a working querier and last known multicast forwarding configuration to recover legitimate receivers. IGMP snooping constrains multicast delivery based on reported listeners, and a querier maintains membership state over time. The focused rollback restores a known safe baseline before another change attempt. The decision applies to the described igmp snooping multicast membership situation.
Incorrect Answers
A:Restore the previously working end-to-end MTU and revert the isolated change if large traffic still fails. This instead concerns mtu mismatch in a campus path. A single low-MTU hop can disrupt large packets even while small connectivity probes succeed; end-to-end sizing matters. It would not safely roll back the relevant failed change. The immediate problem concerns igmp snooping multicast membership.
B:Restore the last valid SVI address and routing policy to reestablish gateway functionality before retrying migration. This instead concerns svi versus layer 2 access interface. A Layer 2 VLAN groups frames, whereas an SVI provides an IP routing interface; one does not automatically create the other. It would not safely roll back the relevant failed change. The immediate problem concerns igmp snooping multicast membership.
C:Restore the last correct trunk allowed list and matching tag configuration before reopening the affected VLAN. This instead concerns vlan tagging on an 802.1q trunk. An IEEE 802.1Q trunk carries multiple VLANs by tags; permitted VLAN membership and native-tag treatment must agree across the link. It would not safely roll back the relevant failed change. The immediate problem concerns igmp snooping multicast membership.
Question 253
A training room's multicast video stops after the only IGMP querier disappears and membership records age out. Before implementing a remedy, what should the engineer check first?
- Review interface and path MTUs, oversized drop counters and ICMP packet-too-big handling.
- Review VLAN membership, switched-port state, SVI IP address and whether Layer 3 forwarding is enabled on the intended device.
- Review IGMP querier availability, learned group memberships and multicast forwarding ports on the VLAN.
- Review trunk allowed VLANs, tag state and the connected device's matching VLAN expectations.
Explanation
Correct Answer
C:Review IGMP querier availability, learned group memberships and multicast forwarding ports on the VLAN. IGMP snooping constrains multicast delivery based on reported listeners, and a querier maintains membership state over time. The evidence check isolates the relevant prerequisite before a disruptive change. The decision applies to the described igmp snooping multicast membership situation.
Incorrect Answers
A:Review interface and path MTUs, oversized drop counters and ICMP packet-too-big handling. This instead concerns mtu mismatch in a campus path. A single low-MTU hop can disrupt large packets even while small connectivity probes succeed; end-to-end sizing matters. It does not isolate the cause of the stated incident. The immediate problem concerns igmp snooping multicast membership.
B:Review VLAN membership, switched-port state, SVI IP address and whether Layer 3 forwarding is enabled on the intended device. This instead concerns svi versus layer 2 access interface. A Layer 2 VLAN groups frames, whereas an SVI provides an IP routing interface; one does not automatically create the other. It does not isolate the cause of the stated incident. The immediate problem concerns igmp snooping multicast membership.
D:Review trunk allowed VLANs, tag state and the connected device's matching VLAN expectations. This instead concerns vlan tagging on an 802.1q trunk. An IEEE 802.1Q trunk carries multiple VLANs by tags; permitted VLAN membership and native-tag treatment must agree across the link. It does not isolate the cause of the stated incident. The immediate problem concerns igmp snooping multicast membership.
Question 254
A training room's multicast video stops after the only IGMP querier disappears and membership records age out. The review requires TWO complementary actions: one diagnostic check and one controlled configuration remedy. Select TWO actions that together meet those requirements.
- Review interface and path MTUs, oversized drop counters and ICMP packet-too-big handling.
- Review IGMP querier availability, learned group memberships and multicast forwarding ports on the VLAN.
- Establish or restore the authorized routed VLAN interface and its routing or ACL context, keeping access ports Layer 2.
- Activate compatible IGMP snooping with a reachable querier and approved multicast groups for the affected segment.
Explanation
Correct Answers
B:Review IGMP querier availability, learned group memberships and multicast forwarding ports on the VLAN. IGMP snooping constrains multicast delivery based on reported listeners, and a querier maintains membership state over time. This is the required diagnosis or controlled remedy; the other keyed action supplies the complementary role. The decision applies to the described igmp snooping multicast membership situation.
D:Activate compatible IGMP snooping with a reachable querier and approved multicast groups for the affected segment. IGMP snooping constrains multicast delivery based on reported listeners, and a querier maintains membership state over time. This is the required diagnosis or controlled remedy; the other keyed action supplies the complementary role. The decision applies to the described igmp snooping multicast membership situation.
Incorrect Answers
A:Review interface and path MTUs, oversized drop counters and ICMP packet-too-big handling. This instead concerns mtu mismatch in a campus path. A single low-MTU hop can disrupt large packets even while small connectivity probes succeed; end-to-end sizing matters. It is not one of the requested paired diagnosis and configuration actions. The immediate problem concerns igmp snooping multicast membership.
C:Establish or restore the authorized routed VLAN interface and its routing or ACL context, keeping access ports Layer 2. This instead concerns svi versus layer 2 access interface. A Layer 2 VLAN groups frames, whereas an SVI provides an IP routing interface; one does not automatically create the other. It is not one of the requested paired diagnosis and configuration actions. The immediate problem concerns igmp snooping multicast membership.
Question 255
A training room's multicast video stops after the only IGMP querier disappears and membership records age out. A deployment job reports success. Which observed result would actually validate the affected service?
- Confirm only subscribed receiver ports receive the test stream while membership survives the query interval.
- Exercise payloads near the intended path size and confirm large frames pass without fragmentation-related loss.
- Confirm same-VLAN switching and permitted cross-VLAN routing through the intended SVI without unexpected leakage.
- Collect tagged test frames and verify each client VLAN reaches only its intended gateway.
Explanation
Correct Answer
A:Confirm only subscribed receiver ports receive the test stream while membership survives the query interval. IGMP snooping constrains multicast delivery based on reported listeners, and a querier maintains membership state over time. The result tests actual working behavior, not merely a saved configuration. The decision applies to the described igmp snooping multicast membership situation.
Incorrect Answers
B:Exercise payloads near the intended path size and confirm large frames pass without fragmentation-related loss. This instead concerns mtu mismatch in a campus path. A single low-MTU hop can disrupt large packets even while small connectivity probes succeed; end-to-end sizing matters. It would not establish that this function actually works. The immediate problem concerns igmp snooping multicast membership.
C:Confirm same-VLAN switching and permitted cross-VLAN routing through the intended SVI without unexpected leakage. This instead concerns svi versus layer 2 access interface. A Layer 2 VLAN groups frames, whereas an SVI provides an IP routing interface; one does not automatically create the other. It would not establish that this function actually works. The immediate problem concerns igmp snooping multicast membership.
D:Collect tagged test frames and verify each client VLAN reaches only its intended gateway. This instead concerns vlan tagging on an 802.1q trunk. An IEEE 802.1Q trunk carries multiple VLANs by tags; permitted VLAN membership and native-tag treatment must agree across the link. It would not establish that this function actually works. The immediate problem concerns igmp snooping multicast membership.
Question 256
A training room's multicast video stops after the only IGMP querier disappears and membership records age out. If the revised setting disrupts users, which controlled rollback would be most relevant?
- Reinstate the previously working end-to-end MTU and revert the isolated change if large traffic still fails.
- Reinstate the last valid SVI address and routing policy to reestablish gateway functionality before retrying migration.
- Reinstate the last correct trunk allowed list and matching tag configuration before reopening the affected VLAN.
- Reinstate a working querier and last known multicast forwarding configuration to recover legitimate receivers.
Explanation
Correct Answer
D:Reinstate a working querier and last known multicast forwarding configuration to recover legitimate receivers. IGMP snooping constrains multicast delivery based on reported listeners, and a querier maintains membership state over time. The focused rollback restores a known safe baseline before another change attempt. The decision applies to the described igmp snooping multicast membership situation.
Incorrect Answers
A:Reinstate the previously working end-to-end MTU and revert the isolated change if large traffic still fails. This instead concerns mtu mismatch in a campus path. A single low-MTU hop can disrupt large packets even while small connectivity probes succeed; end-to-end sizing matters. It would not safely roll back the relevant failed change. The immediate problem concerns igmp snooping multicast membership.
B:Reinstate the last valid SVI address and routing policy to reestablish gateway functionality before retrying migration. This instead concerns svi versus layer 2 access interface. A Layer 2 VLAN groups frames, whereas an SVI provides an IP routing interface; one does not automatically create the other. It would not safely roll back the relevant failed change. The immediate problem concerns igmp snooping multicast membership.
C:Reinstate the last correct trunk allowed list and matching tag configuration before reopening the affected VLAN. This instead concerns vlan tagging on an 802.1q trunk. An IEEE 802.1Q trunk carries multiple VLANs by tags; permitted VLAN membership and native-tag treatment must agree across the link. It would not safely roll back the relevant failed change. The immediate problem concerns igmp snooping multicast membership.
Question 257
A switch fabric passes small pings but drops larger application frames after one aggregation interface was left at a smaller MTU. Which investigation would best isolate the immediate network dependency?
- Inspect VLAN membership, switched-port state, SVI IP address and whether Layer 3 forwarding is enabled on the intended device.
- Inspect trunk allowed VLANs, tag state and the connected device's matching VLAN expectations.
- Inspect native VLAN settings and untagged ingress or egress classification on both connected trunk interfaces.
- Inspect interface and path MTUs, oversized drop counters and ICMP packet-too-big handling.
Explanation
Correct Answer
D:Inspect interface and path MTUs, oversized drop counters and ICMP packet-too-big handling. A single low-MTU hop can disrupt large packets even while small connectivity probes succeed; end-to-end sizing matters. The evidence check isolates the relevant prerequisite before a disruptive change. The decision applies to the described mtu mismatch in a campus path situation.
Incorrect Answers
A:Inspect VLAN membership, switched-port state, SVI IP address and whether Layer 3 forwarding is enabled on the intended device. This instead concerns svi versus layer 2 access interface. A Layer 2 VLAN groups frames, whereas an SVI provides an IP routing interface; one does not automatically create the other. It does not isolate the cause of the stated incident. The immediate problem concerns mtu mismatch in a campus path.
B:Inspect trunk allowed VLANs, tag state and the connected device's matching VLAN expectations. This instead concerns vlan tagging on an 802.1q trunk. An IEEE 802.1Q trunk carries multiple VLANs by tags; permitted VLAN membership and native-tag treatment must agree across the link. It does not isolate the cause of the stated incident. The immediate problem concerns mtu mismatch in a campus path.
C:Inspect native VLAN settings and untagged ingress or egress classification on both connected trunk interfaces. This instead concerns native vlan mismatch. A native VLAN mismatch can silently classify untagged frames into different broadcast domains, even while tagged VLANs operate normally. It does not isolate the cause of the stated incident. The immediate problem concerns mtu mismatch in a campus path.
Question 258
A switch fabric passes small pings but drops larger application frames after one aggregation interface was left at a smaller MTU. Which specific corrective design step best meets the stated campus requirement?
- Create or restore the authorized routed VLAN interface and its routing or ACL context, keeping access ports Layer 2.
- Permit the approved tagged VLAN IDs on both ends and set compatible native or untagged VLAN handling.
- Set compatible MTU on each required link and routed path while respecting device and application limits.
- Align the native VLAN to the approved design or explicitly tag the required traffic on both sides.
Explanation
Correct Answer
C:Set compatible MTU on each required link and routed path while respecting device and application limits. A single low-MTU hop can disrupt large packets even while small connectivity probes succeed; end-to-end sizing matters. The proposed configuration targets the stated dependency without broadening unrelated access. The decision applies to the described mtu mismatch in a campus path situation.
Incorrect Answers
A:Create or restore the authorized routed VLAN interface and its routing or ACL context, keeping access ports Layer 2. This instead concerns svi versus layer 2 access interface. A Layer 2 VLAN groups frames, whereas an SVI provides an IP routing interface; one does not automatically create the other. It would not implement the specifically required change. The immediate problem concerns mtu mismatch in a campus path.
B:Permit the approved tagged VLAN IDs on both ends and set compatible native or untagged VLAN handling. This instead concerns vlan tagging on an 802.1q trunk. An IEEE 802.1Q trunk carries multiple VLANs by tags; permitted VLAN membership and native-tag treatment must agree across the link. It would not implement the specifically required change. The immediate problem concerns mtu mismatch in a campus path.
D:Align the native VLAN to the approved design or explicitly tag the required traffic on both sides. This instead concerns native vlan mismatch. A native VLAN mismatch can silently classify untagged frames into different broadcast domains, even while tagged VLANs operate normally. It would not implement the specifically required change. The immediate problem concerns mtu mismatch in a campus path.
Question 259
A switch fabric passes small pings but drops larger application frames after one aggregation interface was left at a smaller MTU. Following a targeted change, which acceptance test would most directly demonstrate success?
- Verify same-VLAN switching and permitted cross-VLAN routing through the intended SVI without unexpected leakage.
- Test payloads near the intended path size and confirm large frames pass without fragmentation-related loss.
- Capture tagged test frames and verify each client VLAN reaches only its intended gateway.
- Verify untagged frames map to the intended VLAN and management traffic remains isolated from client networks.
Explanation
Correct Answer
B:Test payloads near the intended path size and confirm large frames pass without fragmentation-related loss. A single low-MTU hop can disrupt large packets even while small connectivity probes succeed; end-to-end sizing matters. The result tests actual working behavior, not merely a saved configuration. The decision applies to the described mtu mismatch in a campus path situation.
Incorrect Answers
A:Verify same-VLAN switching and permitted cross-VLAN routing through the intended SVI without unexpected leakage. This instead concerns svi versus layer 2 access interface. A Layer 2 VLAN groups frames, whereas an SVI provides an IP routing interface; one does not automatically create the other. It would not establish that this function actually works. The immediate problem concerns mtu mismatch in a campus path.
C:Capture tagged test frames and verify each client VLAN reaches only its intended gateway. This instead concerns vlan tagging on an 802.1q trunk. An IEEE 802.1Q trunk carries multiple VLANs by tags; permitted VLAN membership and native-tag treatment must agree across the link. It would not establish that this function actually works. The immediate problem concerns mtu mismatch in a campus path.
D:Verify untagged frames map to the intended VLAN and management traffic remains isolated from client networks. This instead concerns native vlan mismatch. A native VLAN mismatch can silently classify untagged frames into different broadcast domains, even while tagged VLANs operate normally. It would not establish that this function actually works. The immediate problem concerns mtu mismatch in a campus path.
Question 260
A switch fabric passes small pings but drops larger application frames after one aggregation interface was left at a smaller MTU. The change fails acceptance. What is the safest targeted restoration action?
- Restore the previously working end-to-end MTU and revert the isolated change if large traffic still fails.
- Restore the last valid SVI address and routing policy to reestablish gateway functionality before retrying migration.
- Restore the last correct trunk allowed list and matching tag configuration before reopening the affected VLAN.
- Return both trunk ends to the previously matching native VLAN and recheck untagged management reachability.
Explanation
Correct Answer
A:Restore the previously working end-to-end MTU and revert the isolated change if large traffic still fails. A single low-MTU hop can disrupt large packets even while small connectivity probes succeed; end-to-end sizing matters. The focused rollback restores a known safe baseline before another change attempt. The decision applies to the described mtu mismatch in a campus path situation.
Incorrect Answers
B:Restore the last valid SVI address and routing policy to reestablish gateway functionality before retrying migration. This instead concerns svi versus layer 2 access interface. A Layer 2 VLAN groups frames, whereas an SVI provides an IP routing interface; one does not automatically create the other. It would not safely roll back the relevant failed change. The immediate problem concerns mtu mismatch in a campus path.
C:Restore the last correct trunk allowed list and matching tag configuration before reopening the affected VLAN. This instead concerns vlan tagging on an 802.1q trunk. An IEEE 802.1Q trunk carries multiple VLANs by tags; permitted VLAN membership and native-tag treatment must agree across the link. It would not safely roll back the relevant failed change. The immediate problem concerns mtu mismatch in a campus path.
D:Return both trunk ends to the previously matching native VLAN and recheck untagged management reachability. This instead concerns native vlan mismatch. A native VLAN mismatch can silently classify untagged frames into different broadcast domains, even while tagged VLANs operate normally. It would not safely roll back the relevant failed change. The immediate problem concerns mtu mismatch in a campus path.
