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Question 270
A switch contains legacy user VLANs that should no longer be active on any access port. Which observation would best verify that the intended behavior is working?
- Compare traffic counters and storm-control events before and after a controlled burst
- Audit MAC tables, active interfaces and DHCP scopes for the targeted VLANs
- Capture approved and unauthorized RA messages and inspect edge policy counters
- Inspect active members, hashed session paths and tagged-frame counters under load
Explanation
Correct Answer
B:No active endpoint should lose service when the segment is removed. Retiring dormant segments reduces accidental reachability and operational confusion.
Incorrect Answers
A:The threshold must catch abnormal traffic without suppressing normal discovery. By contrast, no active endpoint should lose service when the segment is removed.
C:The guard must block the rogue source while allowing real gateway advertisements. In this situation, no active endpoint should lose service when the segment is removed.
D:Per-member evidence helps isolate a bad link or mismatch. It would not resolve the documented symptom; no active endpoint should lose service when the segment is removed.
Question 271
A switch contains legacy user VLANs that should no longer be active on any access port. Which belief about the configuration should the team reject?
- Raise every uplink speed without examining oversized broadcast-domain design
- Delete every VLAN with zero current MACs without checking scheduled or dormant devices
- Assume two independent switches can always masquerade as one ordinary LAG peer
- Assign the same gateway IP independently to unrelated routers without an HA protocol
Explanation
Correct Answer
B:A quiet time window can miss legitimate off-hours use. Retiring dormant segments reduces accidental reachability and operational confusion.
Incorrect Answers
A:More bandwidth alone does not correct excess flooding scope. By contrast, a quiet time window can miss legitimate off-hours use.
C:Without a supported MC-LAG design the partner identities may conflict. The relevant technical distinction is that a quiet time window can miss legitimate off-hours use.
D:Duplicate addressing can cause intermittent reachability. It would not resolve the documented symptom; a quiet time window can miss legitimate off-hours use.
Question 272
A switch contains legacy user VLANs that should no longer be active on any access port. What should be included in the rollout plan to limit a foreseeable failure?
- Stage subnet/DHCP changes alongside network segmentation
- Document decommission approval and keep a tested rollback window
- Test gateway switchover with both links and management sessions monitored
- Test each member independently before declaring the bundled uplink healthy
Explanation
Correct Answer
B:Removing shared VLANs should follow change control. No active endpoint should lose service when the segment is removed.
Incorrect Answers
A:A routing redesign requires addressing and policy coordination. The relevant technical distinction is that removing shared VLANs should follow change control.
C:Gateway failover must preserve client communication. By contrast, removing shared VLANs should follow change control.
D:A balanced bundle should not contain one defective path. Here, however, removing shared VLANs should follow change control.
Question 273
A remote printer on an access VLAN has intermittent network drops but interface link never goes down. What should the network engineer do to address this requirement?
- Restore the intended untagged VLAN or explicit tagged management transport
- Inspect error counters, port flaps, STP state and MAC aging for that specific port
- Align LACP active/passive modes and bundle membership on both endpoints
- Configure the trunk native VLAN and allowed tagged VLAN list consistently at both ends
Explanation
Correct Answer
B:Layer 2 instability can interrupt sessions while physical carrier remains up. Timing and L2 state distinguish port forwarding from printer behavior.
Incorrect Answers
A:Untagged management frames must land in the proper VLAN at both link ends. Here, however, layer 2 instability can interrupt sessions while physical carrier remains up.
C:Negotiation and common aggregation parameters are needed for a functional LAG. The relevant technical distinction is that layer 2 instability can interrupt sessions while physical carrier remains up.
D:Proper tagging preserves the intended separation across the uplink. In this situation, layer 2 instability can interrupt sessions while physical carrier remains up.
Question 274
A remote printer on an access VLAN has intermittent network drops but interface link never goes down. What should the team inspect to confirm the result?
- Inspect snooping bindings and confirm test rogue offers are blocked while valid leases work
- Connect an authorized phone and PC, then a third test device, and observe violation behavior
- Inspect LACP actor and partner identifiers and active collector/distributor flags
- Correlate printer failures with topology changes and learned MAC movement
Explanation
Correct Answer
D:Timing and L2 state distinguish port forwarding from printer behavior. Layer 2 instability can interrupt sessions while physical carrier remains up.
Incorrect Answers
A:The control must block the rogue source without breaking real DHCP. Here, however, timing and L2 state distinguish port forwarding from printer behavior.
B:Both acceptance and rejection establish the effective limit. In this situation, timing and L2 state distinguish port forwarding from printer behavior.
C:Protocol details show why one member was excluded. It would not resolve the documented symptom; timing and L2 state distinguish port forwarding from printer behavior.
Question 275
A remote printer on an access VLAN has intermittent network drops but interface link never goes down. Which misconception is most likely to obstruct a correct fix?
- Assume a continuously lit link LED proves the entire data path is stable
- Enable IPv4 DHCP snooping and assume IPv6 RAs are controlled automatically
- Raise every uplink speed without examining oversized broadcast-domain design
- Paste old port commands without reviewing platform port layout or supported syntax
Explanation
Correct Answer
A:Physical carrier does not exclude STP blocking or frame errors. Layer 2 instability can interrupt sessions while physical carrier remains up.
Incorrect Answers
B:IPv4 DHCP security does not validate IPv6 router advertisements. By contrast, physical carrier does not exclude STP blocking or frame errors.
C:More bandwidth alone does not correct excess flooding scope. It would not resolve the documented symptom; physical carrier does not exclude STP blocking or frame errors.
D:Blind migrations can apply uplink settings to user interfaces. In this situation, physical carrier does not exclude STP blocking or frame errors.
Question 276
A remote printer on an access VLAN has intermittent network drops but interface link never goes down. What precaution is most important before the change is expanded?
- Test gateway switchover with both links and management sessions monitored
- Use a controlled port and cable swap while retaining the original configuration
- Document IPv6 control-plane trust ports and test dual-stack clients
- Verify the DHCP relay and any authorized server uplinks before enabling globally
Explanation
Correct Answer
B:Changing one variable helps identify the fault without broad disruption. Timing and L2 state distinguish port forwarding from printer behavior.
Incorrect Answers
A:Gateway failover must preserve client communication. The relevant technical distinction is that changing one variable helps identify the fault without broad disruption.
C:Protecting only IPv4 leaves a separate attack path. It would not resolve the documented symptom; changing one variable helps identify the fault without broad disruption.
D:Inaccurate trust boundaries can stop all address assignment. By contrast, changing one variable helps identify the fault without broad disruption.
Question 277
A campus uses private VLANs to restrict peer-to-peer access among hosts that share an IP subnet. Which configuration decision most directly resolves the situation?
- Apply the supported private-VLAN isolation and promiscuous-port mapping
- Check creation of the VLAN and its permitted status on each relevant trunk
- Map the supported interface identifiers to the intended patch-panel ports before applying configuration
- Inspect trunk allowed-VLAN lists and native/tagged state at both switches
Explanation
Correct Answer
A:Layer 2 host isolation can be implemented without changing each host's address plan. The test verifies that only approved local peers are reachable.
Incorrect Answers
B:An allowed tag that does not exist or propagate cannot forward frames. Here, however, layer 2 host isolation can be implemented without changing each host's address plan.
C:A valid port label on one platform may refer to a different port on another. The relevant technical distinction is that layer 2 host isolation can be implemented without changing each host's address plan.
D:Missing one VLAN on an otherwise healthy trunk isolates the problem to membership. By contrast, layer 2 host isolation can be implemented without changing each host's address plan.
Question 278
A campus uses private VLANs to restrict peer-to-peer access among hosts that share an IP subnet. Which check most directly demonstrates the desired network behavior?
- Test isolated-host communication versus access to the designated gateway/service port
- Capture approved and unauthorized RA messages and inspect edge policy counters
- Compare CRC and alignment counters using a known-good cable and endpoint
- Inspect active members, hashed session paths and tagged-frame counters under load
Explanation
Correct Answer
A:The test verifies that only approved local peers are reachable. Layer 2 host isolation can be implemented without changing each host's address plan.
Incorrect Answers
B:The guard must block the rogue source while allowing real gateway advertisements. Here, however, the test verifies that only approved local peers are reachable.
C:A controlled replacement isolates physical-layer defects. In this situation, the test verifies that only approved local peers are reachable.
D:Per-member evidence helps isolate a bad link or mismatch. The relevant technical distinction is that the test verifies that only approved local peers are reachable.
Question 279
A campus uses private VLANs to restrict peer-to-peer access among hosts that share an IP subnet. Which assumption would be most misleading when investigating this situation?
- Set the allowed MAC count to one where a documented phone and desktop share the port
- Assume a common IPv4 subnet necessarily requires full host-to-host Layer 2 access
- Paste old port commands without reviewing platform port layout or supported syntax
- Disable all broadcast controls to keep the user port online
Explanation
Correct Answer
B:Private VLAN design can restrict local peer communication. Layer 2 host isolation can be implemented without changing each host's address plan.
Incorrect Answers
A:An overrestrictive limit will disable valid access. In this situation, private VLAN design can restrict local peer communication.
C:Blind migrations can apply uplink settings to user interfaces. Here, however, private VLAN design can restrict local peer communication.
D:That may let a small wiring error affect the whole VLAN. It would not resolve the documented symptom; private VLAN design can restrict local peer communication.
Question 280
A campus uses private VLANs to restrict peer-to-peer access among hosts that share an IP subnet. Which safeguard best reduces the deployment risk in this case?
- Document IPv6 control-plane trust ports and test dual-stack clients
- Verify the DHCP relay and any authorized server uplinks before enabling globally
- Review gateway and service exceptions before enforcing isolation
- Record the faulted patch-port and confirm the cable path meets distance requirements
Explanation
Correct Answer
C:Shared printers or support services may need explicit connectivity. The test verifies that only approved local peers are reachable.
Incorrect Answers
A:Protecting only IPv4 leaves a separate attack path. In this situation, shared printers or support services may need explicit connectivity.
B:Inaccurate trust boundaries can stop all address assignment. By contrast, shared printers or support services may need explicit connectivity.
D:Recurring bad media should not be treated as a software mystery. It would not resolve the documented symptom; shared printers or support services may need explicit connectivity.
HPE Network Campus Access Professional (HPE7-A01) Practice Tests