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HP HPE7-A01 Practice Test 29

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?

  1. Document IPv6 control-plane trust ports and test dual-stack clients
  2. Verify the DHCP relay and any authorized server uplinks before enabling globally
  3. Review gateway and service exceptions before enforcing isolation
  4. 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.

Question 281

An aggregation switch receives numerous tagged VLANs but one new tagged VLAN is not learned downstream. What is the most appropriate first technical change?

  1. Review LACP distribution and supported per-flow hashing behavior
  2. Investigate MAC address learning, VLAN path and any topology changes
  3. Check creation of the VLAN and its permitted status on each relevant trunk
  4. Align MST region parameters and VLAN-to-instance maps across participating devices

Explanation

Correct Answer

C:

An allowed tag that does not exist or propagate cannot forward frames. The trace identifies where the forwarding chain breaks.

Incorrect Answers

A:

Hashing can preserve a flow on one member even when the bundle has several links. By contrast, an allowed tag that does not exist or propagate cannot forward frames.

B:

Unknown-unicast traffic is flooded when the switch has not learned the destination location. It would not resolve the documented symptom; an allowed tag that does not exist or propagate cannot forward frames.

D:

Consistent region membership is necessary for predictable MST behavior. The relevant technical distinction is that an allowed tag that does not exist or propagate cannot forward frames.

Question 282

An aggregation switch receives numerous tagged VLANs but one new tagged VLAN is not learned downstream. Which observation would best verify that the intended behavior is working?

  1. Inspect active VLANs and tagged packet counters at both ends of the link
  2. Measure link-up to DHCP timing and ensure no bridge neighbor is attached
  3. Test isolated-host communication versus access to the designated gateway/service port
  4. Connect an authorized phone and PC, then a third test device, and observe violation behavior

Explanation

Correct Answer

A:

The trace identifies where the forwarding chain breaks. An allowed tag that does not exist or propagate cannot forward frames.

Incorrect Answers

B:

The optimization is safe only for genuine edge ports. Here, however, the trace identifies where the forwarding chain breaks.

C:

The test verifies that only approved local peers are reachable. The relevant technical distinction is that the trace identifies where the forwarding chain breaks.

D:

Both acceptance and rejection establish the effective limit. By contrast, the trace identifies where the forwarding chain breaks.

Question 283

An aggregation switch receives numerous tagged VLANs but one new tagged VLAN is not learned downstream. Which belief about the configuration should the team reject?

  1. Add a matching IP route and assume a missing Layer 2 VLAN becomes active
  2. Mark every user edge port trusted to prevent DHCP failures
  3. Enable edge behavior indiscriminately on every inter-switch trunk
  4. Disable spanning tree globally so both cables forward at once

Explanation

Correct Answer

A:

L3 routing cannot create a VLAN on a switchport. An allowed tag that does not exist or propagate cannot forward frames.

Incorrect Answers

B:

Trusting user ports defeats the rogue-server protection. In this situation, l3 routing cannot create a VLAN on a switchport.

C:

Network-facing ports still require loop protection. The relevant technical distinction is that l3 routing cannot create a VLAN on a switchport.

D:

Removing loop prevention can amplify broadcast storms. Here, however, l3 routing cannot create a VLAN on a switchport.

Question 284

An aggregation switch receives numerous tagged VLANs but one new tagged VLAN is not learned downstream. What should be included in the rollout plan to limit a foreseeable failure?

  1. Run a representative endpoint connectivity test and preserve rollback of the port profile
  2. Restore the port only after removing the loop and documenting the trigger
  3. Document known exceptions such as docks and replacement NICs
  4. Keep a verified VLAN provisioning checklist across access and aggregation devices

Explanation

Correct Answer

D:

A single incomplete configuration step can isolate a floor. The trace identifies where the forwarding chain breaks.

Incorrect Answers

A:

One device can expose a mapping error before a whole row of ports moves. Here, however, a single incomplete configuration step can isolate a floor.

B:

Recovery must not immediately recreate the storm. It would not resolve the documented symptom; a single incomplete configuration step can isolate a floor.

C:

Asset changes need a controlled authorization path. In this situation, a single incomplete configuration step can isolate a floor.

Question 285

A campus uses LLDP for inventory, but an access switch advertises a management address from the wrong VRF. What should the network engineer do to address this requirement?

  1. Correct the LLDP management address advertisement and intended management context
  2. Configure the trunk native VLAN and allowed tagged VLAN list consistently at both ends
  3. Enable DHCP snooping with trusted uplinks and untrusted user access ports
  4. Align MST region parameters and VLAN-to-instance maps across participating devices

Explanation

Correct Answer

A:

Neighbor inventory should reflect reachable approved management endpoints. A correct LLDP neighbor name can still carry an unusable management IP.

Incorrect Answers

B:

Proper tagging preserves the intended separation across the uplink. It would not resolve the documented symptom; neighbor inventory should reflect reachable approved management endpoints.

C:

Snooping can reject unauthorized server offers on client-facing interfaces. In this situation, neighbor inventory should reflect reachable approved management endpoints.

D:

Consistent region membership is necessary for predictable MST behavior. By contrast, neighbor inventory should reflect reachable approved management endpoints.

Question 286

A campus uses LLDP for inventory, but an access switch advertises a management address from the wrong VRF. What should the team inspect to confirm the result?

  1. Compare the advertised management TLV with the actual device routing and addresses
  2. Capture approved and unauthorized RA messages and inspect edge policy counters
  3. Measure broadcast utilization and user performance before and after moving a pilot subnet
  4. Inspect active members, hashed session paths and tagged-frame counters under load

Explanation

Correct Answer

A:

A correct LLDP neighbor name can still carry an unusable management IP. Neighbor inventory should reflect reachable approved management endpoints.

Incorrect Answers

B:

The guard must block the rogue source while allowing real gateway advertisements. By contrast, a correct LLDP neighbor name can still carry an unusable management IP.

C:

Improved L2 containment should produce measurable results. The relevant technical distinction is that a correct LLDP neighbor name can still carry an unusable management IP.

D:

Per-member evidence helps isolate a bad link or mismatch. It would not resolve the documented symptom; a correct LLDP neighbor name can still carry an unusable management IP.

Question 287

A campus uses LLDP for inventory, but an access switch advertises a management address from the wrong VRF. Which misconception is most likely to obstruct a correct fix?

  1. Assume LLDP discovers reachable routes for every advertised management address
  2. Mark every user edge port trusted to prevent DHCP failures
  3. Assume one working client flow proves every LAG member is configured correctly
  4. Assume the old VLAN MAC table is instantly updated without any new traffic

Explanation

Correct Answer

A:

LLDP conveys topology information, not routing-table contents. Neighbor inventory should reflect reachable approved management endpoints.

Incorrect Answers

B:

Trusting user ports defeats the rogue-server protection. Here, however, lLDP conveys topology information, not routing-table contents.

C:

Hashing can hide a fault until traffic chooses the affected member. By contrast, lLDP conveys topology information, not routing-table contents.

D:

Entries may persist until relearn or expiry. The relevant technical distinction is that lLDP conveys topology information, not routing-table contents.

Question 288

A campus uses LLDP for inventory, but an access switch advertises a management address from the wrong VRF. What precaution is most important before the change is expanded?

  1. Document IPv6 control-plane trust ports and test dual-stack clients
  2. Review management reachability from the monitoring system after changing TLVs
  3. Limit multicast to intended receivers and test one source leaving the network
  4. Run a representative endpoint connectivity test and preserve rollback of the port profile

Explanation

Correct Answer

B:

Inventory accuracy depends on real operator access. A correct LLDP neighbor name can still carry an unusable management IP.

Incorrect Answers

A:

Protecting only IPv4 leaves a separate attack path. The relevant technical distinction is that inventory accuracy depends on real operator access.

C:

Uncontrolled multicast can consume shared uplink capacity. In this situation, inventory accuracy depends on real operator access.

D:

One device can expose a mapping error before a whole row of ports moves. Here, however, inventory accuracy depends on real operator access.

Question 289

A routed campus stack sees duplicate default gateway ARP replies from two uncoordinated devices. Which configuration decision most directly resolves the situation?

  1. Choose a documented first-hop redundancy or active-gateway approach with unique virtual identity
  2. Align LACP active/passive modes and bundle membership on both endpoints
  3. Configure a supported routed Layer 3 interface and explicit peering/subnet
  4. Use validated DHCP snooping bindings with dynamic ARP inspection where supported

Explanation

Correct Answer

A:

Coordinated gateway ownership avoids inconsistent ARP information. The MAC and virtual-address state explain competing replies.

Incorrect Answers

B:

Negotiation and common aggregation parameters are needed for a functional LAG. Here, however, coordinated gateway ownership avoids inconsistent ARP information.

C:

A routed boundary avoids unnecessary L2 extension between administrative domains. It would not resolve the documented symptom; coordinated gateway ownership avoids inconsistent ARP information.

D:

A binding table can be used to reject forged address-to-MAC claims. In this situation, coordinated gateway ownership avoids inconsistent ARP information.

Question 290

A routed campus stack sees duplicate default gateway ARP replies from two uncoordinated devices. Which check most directly demonstrates the desired network behavior?

  1. Compare traffic counters and storm-control events before and after a controlled burst
  2. Capture gateway ARP replies and verify intended active/standby or active-gateway behavior
  3. Inspect switch trunk state and endpoint VLAN membership on each side
  4. Inspect snooping bindings and confirm test rogue offers are blocked while valid leases work

Explanation

Correct Answer

B:

The MAC and virtual-address state explain competing replies. Coordinated gateway ownership avoids inconsistent ARP information.

Incorrect Answers

A:

The threshold must catch abnormal traffic without suppressing normal discovery. By contrast, the MAC and virtual-address state explain competing replies.

C:

Both tagged and untagged frames must reach their intended segment. It would not resolve the documented symptom; the MAC and virtual-address state explain competing replies.

D:

The control must block the rogue source without breaking real DHCP. In this situation, the MAC and virtual-address state explain competing replies.

HPE Network Campus Access Professional (HPE7-A01) Practice Tests

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