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Question 250
A user edge port needs a fixed maximum number of legitimate MAC addresses. What should the team inspect to confirm the result?
- Inspect active members, hashed session paths and tagged-frame counters under load
- Connect an authorized phone and PC, then a third test device, and observe violation behavior
- Verify LLDP neighbors and configured roles on sample physical ports after deployment
- Review partner system IDs, LACP member status and interface error counters
Explanation
Correct Answer
B:Both acceptance and rejection establish the effective limit. The limit should accommodate approved devices while blocking unplanned bridging.
Incorrect Answers
A:Per-member evidence helps isolate a bad link or mismatch. In this situation, both acceptance and rejection establish the effective limit.
C:Live adjacency checks catch wrong interface mappings. By contrast, both acceptance and rejection establish the effective limit.
D:Protocol state distinguishes incompatible bundling from a physical fault. It would not resolve the documented symptom; both acceptance and rejection establish the effective limit.
Question 251
A user edge port needs a fixed maximum number of legitimate MAC addresses. Which misconception is most likely to obstruct a correct fix?
- Assume enabling IGMP snooping on access switches creates multicast routes between subnets
- Leave a switchport as an unconfigured access VLAN and assume it creates a Layer 3 transit
- Assume a common IPv4 subnet necessarily requires full host-to-host Layer 2 access
- Set the allowed MAC count to one where a documented phone and desktop share the port
Explanation
Correct Answer
D:An overrestrictive limit will disable valid access. The limit should accommodate approved devices while blocking unplanned bridging.
Incorrect Answers
A:Snooping does not replace routed multicast configuration. The relevant technical distinction is that an overrestrictive limit will disable valid access.
B:VLAN switching does not imply an addressed routed interface. By contrast, an overrestrictive limit will disable valid access.
C:Private VLAN design can restrict local peer communication. It would not resolve the documented symptom; an overrestrictive limit will disable valid access.
Question 252
A user edge port needs a fixed maximum number of legitimate MAC addresses. What precaution is most important before the change is expanded?
- Document known exceptions such as docks and replacement NICs
- Keep a verified VLAN provisioning checklist across access and aggregation devices
- Validate identical speed and native VLAN assumptions before putting the bundle into service
- Stage native-VLAN changes with console or out-of-band recovery ready
Explanation
Correct Answer
A:Asset changes need a controlled authorization path. Both acceptance and rejection establish the effective limit.
Incorrect Answers
B:A single incomplete configuration step can isolate a floor. Here, however, asset changes need a controlled authorization path.
C:A LAG with mismatched port behavior can disrupt multiple VLANs. By contrast, asset changes need a controlled authorization path.
D:A trunk error can lock out remote management. The relevant technical distinction is that asset changes need a controlled authorization path.
Question 253
A distribution trunk loses connectivity only to one VLAN after a new access switch is attached. Which configuration decision most directly resolves the situation?
- Review LACP distribution and supported per-flow hashing behavior
- Investigate MAC address learning, VLAN path and any topology changes
- Enable DHCP snooping with trusted uplinks and untrusted user access ports
- Inspect trunk allowed-VLAN lists and native/tagged state at both switches
Explanation
Correct Answer
D:Missing one VLAN on an otherwise healthy trunk isolates the problem to membership. Protocol frames and MAC learning show whether the tag travels.
Incorrect Answers
A:Hashing can preserve a flow on one member even when the bundle has several links. Here, however, missing one VLAN on an otherwise healthy trunk isolates the problem to membership.
B:Unknown-unicast traffic is flooded when the switch has not learned the destination location. The relevant technical distinction is that missing one VLAN on an otherwise healthy trunk isolates the problem to membership.
C:Snooping can reject unauthorized server offers on client-facing interfaces. In this situation, missing one VLAN on an otherwise healthy trunk isolates the problem to membership.
Question 254
A distribution trunk loses connectivity only to one VLAN after a new access switch is attached. Which check most directly demonstrates the desired network behavior?
- Trace an affected VLAN tag across the link and compare the trunk's active list
- Connect an authorized phone and PC, then a third test device, and observe violation behavior
- Capture approved and unauthorized RA messages and inspect edge policy counters
- Inspect snooping bindings and confirm test rogue offers are blocked while valid leases work
Explanation
Correct Answer
A:Protocol frames and MAC learning show whether the tag travels. Missing one VLAN on an otherwise healthy trunk isolates the problem to membership.
Incorrect Answers
B:Both acceptance and rejection establish the effective limit. Here, however, protocol frames and MAC learning show whether the tag travels.
C:The guard must block the rogue source while allowing real gateway advertisements. In this situation, protocol frames and MAC learning show whether the tag travels.
D:The control must block the rogue source without breaking real DHCP. It would not resolve the documented symptom; protocol frames and MAC learning show whether the tag travels.
Question 255
A distribution trunk loses connectivity only to one VLAN after a new access switch is attached. Which assumption would be most misleading when investigating this situation?
- Replace the entire router because the other VLANs still work
- Assume one working client flow proves every LAG member is configured correctly
- Mark every user edge port trusted to prevent DHCP failures
- Assume the old VLAN MAC table is instantly updated without any new traffic
Explanation
Correct Answer
A:Partial VLAN loss points first to tagging and forwarding rather than a global hardware failure. Missing one VLAN on an otherwise healthy trunk isolates the problem to membership.
Incorrect Answers
B:Hashing can hide a fault until traffic chooses the affected member. It would not resolve the documented symptom; partial VLAN loss points first to tagging and forwarding rather than a global hardware failure.
C:Trusting user ports defeats the rogue-server protection. By contrast, partial VLAN loss points first to tagging and forwarding rather than a global hardware failure.
D:Entries may persist until relearn or expiry. In this situation, partial VLAN loss points first to tagging and forwarding rather than a global hardware failure.
Question 256
A distribution trunk loses connectivity only to one VLAN after a new access switch is attached. Which safeguard best reduces the deployment risk in this case?
- Limit multicast to intended receivers and test one source leaving the network
- Document IPv6 control-plane trust ports and test dual-stack clients
- Require an uplink VLAN checklist before opening the new switch to users
- Document known exceptions such as docks and replacement NICs
Explanation
Correct Answer
C:A forgotten permitted VLAN is easier to prevent than discover after cutover. Protocol frames and MAC learning show whether the tag travels.
Incorrect Answers
A:Uncontrolled multicast can consume shared uplink capacity. By contrast, a forgotten permitted VLAN is easier to prevent than discover after cutover.
B:Protecting only IPv4 leaves a separate attack path. It would not resolve the documented symptom; a forgotten permitted VLAN is easier to prevent than discover after cutover.
D:Asset changes need a controlled authorization path. The relevant technical distinction is that a forgotten permitted VLAN is easier to prevent than discover after cutover.
Question 257
A school needs to block an access endpoint from flooding unknown broadcasts during a loop or infection. What is the most appropriate first technical change?
- Investigate MAC address learning, VLAN path and any topology changes
- Apply supported storm-control thresholds based on measured normal traffic
- Enable DHCP snooping with trusted uplinks and untrusted user access ports
- Review LACP distribution and supported per-flow hashing behavior
Explanation
Correct Answer
B:Broadcast and unknown-unicast rate limiting can protect shared L2 resources. The threshold must catch abnormal traffic without suppressing normal discovery.
Incorrect Answers
A:Unknown-unicast traffic is flooded when the switch has not learned the destination location. The relevant technical distinction is that broadcast and unknown-unicast rate limiting can protect shared L2 resources.
C:Snooping can reject unauthorized server offers on client-facing interfaces. Here, however, broadcast and unknown-unicast rate limiting can protect shared L2 resources.
D:Hashing can preserve a flow on one member even when the bundle has several links. By contrast, broadcast and unknown-unicast rate limiting can protect shared L2 resources.
Question 258
A school needs to block an access endpoint from flooding unknown broadcasts during a loop or infection. Which observation would best verify that the intended behavior is working?
- Verify LLDP neighbors and configured roles on sample physical ports after deployment
- Measure broadcast utilization and user performance before and after moving a pilot subnet
- Compare traffic counters and storm-control events before and after a controlled burst
- Inspect the routed port address, ARP/neighbor state and installed route
Explanation
Correct Answer
C:The threshold must catch abnormal traffic without suppressing normal discovery. Broadcast and unknown-unicast rate limiting can protect shared L2 resources.
Incorrect Answers
A:Live adjacency checks catch wrong interface mappings. The relevant technical distinction is that the threshold must catch abnormal traffic without suppressing normal discovery.
B:Improved L2 containment should produce measurable results. In this situation, the threshold must catch abnormal traffic without suppressing normal discovery.
D:A healthy physical link alone cannot prove routed forwarding. Here, however, the threshold must catch abnormal traffic without suppressing normal discovery.
Question 259
A school needs to block an access endpoint from flooding unknown broadcasts during a loop or infection. Which belief about the configuration should the team reject?
- Expect a single TCP stream to fill every physical LAG member simultaneously
- Paste old port commands without reviewing platform port layout or supported syntax
- Assume a switch always drops every broadcast beyond what users need by default
- Raise every uplink speed without examining oversized broadcast-domain design
Explanation
Correct Answer
C:L2 broadcast delivery is an essential behavior and needs deliberate limits. Broadcast and unknown-unicast rate limiting can protect shared L2 resources.
Incorrect Answers
A:Standard per-flow distribution commonly chooses one member per flow. Here, however, l2 broadcast delivery is an essential behavior and needs deliberate limits.
B:Blind migrations can apply uplink settings to user interfaces. In this situation, l2 broadcast delivery is an essential behavior and needs deliberate limits.
D:More bandwidth alone does not correct excess flooding scope. It would not resolve the documented symptom; l2 broadcast delivery is an essential behavior and needs deliberate limits.
Question 260
A school needs to block an access endpoint from flooding unknown broadcasts during a loop or infection. What should be included in the rollout plan to limit a foreseeable failure?
- Check that no sensitive campus VLANs remain allowed on the handoff
- Test DHCP, ARP and normal multicast at the chosen threshold
- Record the faulted patch-port and confirm the cable path meets distance requirements
- Size bundles for realistic traffic patterns and surviving member capacity
Explanation
Correct Answer
B:Overaggressive control can break foundational network services. The threshold must catch abnormal traffic without suppressing normal discovery.
Incorrect Answers
A:L3 handoffs should not unintentionally bridge client segments. By contrast, overaggressive control can break foundational network services.
C:Recurring bad media should not be treated as a software mystery. In this situation, overaggressive control can break foundational network services.
D:Aggregate advertised rate does not guarantee every individual application's speed. It would not resolve the documented symptom; overaggressive control can break foundational network services.
HPE Network Campus Access Professional (HPE7-A01) Practice Tests