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HP HPE7-A01 Practice Test 51

Question 500

A campus has three OSPF areas, but the team places every access VLAN into backbone area 0 without a scaling review. Which THREE steps together deliver the change, verify its effect, and reduce rollout risk? Choose THREE.

  1. Document growth targets and validate area-boundary reachability
  2. Test routed packet size after aligning the MTU
  3. Inspect area membership and LSDB size before and after the change
  4. Apply a reviewed inbound prefix list or route-map filter for that neighbor
  5. Design an appropriate area hierarchy and summarize where supported
  6. Use an appropriate internal BGP path-preference policy and inspect best-path selection

Explanation

Correct Answers

A:

A poorly designed area split can isolate subnets. Lower unnecessary control-plane growth supports scaling.

C:

Lower unnecessary control-plane growth supports scaling. Area planning can reduce excessive topology information and control scope.

E:

Area planning can reduce excessive topology information and control scope. Lower unnecessary control-plane growth supports scaling.

Incorrect Answers

B:

A stable neighbor does not alone guarantee application transport. It would not resolve the documented symptom; a poorly designed area split can isolate subnets.

D:

Import policy prevents unwanted external reachability information. In this situation, area planning can reduce excessive topology information and control scope.

F:

Local BGP attributes can steer the campus's own egress preference. By contrast, area planning can reduce excessive topology information and control scope.

Question 501

A campus has three OSPF areas, but the team places every access VLAN into backbone area 0 without a scaling review. Which check most directly demonstrates the desired network behavior?

  1. Inspect area membership and LSDB size before and after the change
  2. Induce upstream loss and verify the failed route is withdrawn and backup installed
  3. Compare multiple traffic flows and next-hop byte counters during the same period
  4. Compare destination lookups for addresses within and outside the old prefix

Explanation

Correct Answer

A:

Lower unnecessary control-plane growth supports scaling. Area planning can reduce excessive topology information and control scope.

Incorrect Answers

B:

A controlled fault demonstrates correct preference change. The relevant technical distinction is that lower unnecessary control-plane growth supports scaling.

C:

Flow-level evidence explains imbalance better than one speed test. It would not resolve the documented symptom; lower unnecessary control-plane growth supports scaling.

D:

Different route lengths can create partial outages. By contrast, lower unnecessary control-plane growth supports scaling.

Question 502

A campus has three OSPF areas, but the team places every access VLAN into backbone area 0 without a scaling review. Which assumption would be most misleading when investigating this situation?

  1. Change BGP local preference to repair OSPF database-description rejection
  2. Tune local preference before confirming the BGP TCP session can open
  3. Assume adding more areas automatically reduces traffic without configuring inter-area connectivity
  4. Assume every received BGP prefix becomes an active next hop immediately

Explanation

Correct Answer

C:

Areas need correct backbone relationships and route advertisement. Area planning can reduce excessive topology information and control scope.

Incorrect Answers

A:

BGP attributes are unrelated to OSPF MTU negotiation. The relevant technical distinction is that areas need correct backbone relationships and route advertisement.

B:

Route attributes matter only after the session exchanges routes. Here, however, areas need correct backbone relationships and route advertisement.

D:

Route policy and eligibility can leave alternatives uninstalled. By contrast, areas need correct backbone relationships and route advertisement.

Question 503

A campus has three OSPF areas, but the team places every access VLAN into backbone area 0 without a scaling review. Which safeguard best reduces the deployment risk in this case?

  1. Document growth targets and validate area-boundary reachability
  2. Maintain a reviewed route-leak matrix and regression tests
  3. Capacity-plan for hash skew and a full single-link failure
  4. Require security approval and a documented import list for any cross-VRF route

Explanation

Correct Answer

A:

A poorly designed area split can isolate subnets. Lower unnecessary control-plane growth supports scaling.

Incorrect Answers

B:

Shared changes should not contaminate isolated routing tables. In this situation, a poorly designed area split can isolate subnets.

C:

Effective redundancy requires enough surviving bandwidth. The relevant technical distinction is that a poorly designed area split can isolate subnets.

D:

Exceptions must not silently expand administrative reach. Here, however, a poorly designed area split can isolate subnets.

Question 504

A new OSPF routed uplink has a different MTU at each end and neighbor exchange stalls. What is the most appropriate first technical change?

  1. Align the supported interface MTU and review OSPF database exchange diagnostics
  2. Configure appropriate IPv6 router advertisements on the routed campus interface
  3. Review administrative distance and route preference while preserving required policy
  4. Evaluate supported BFD with compatible peer intervals and a controlled change plan

Explanation

Correct Answer

A:

Incompatible MTUs can interrupt database synchronization on some platforms. State and MTU evidence distinguish database failure from loss of hello packets.

Incorrect Answers

B:

Clients typically learn IPv6 default-router information from RAs. In this situation, incompatible MTUs can interrupt database synchronization on some platforms.

C:

Different routing sources can compete for the same destination prefix. It would not resolve the documented symptom; incompatible MTUs can interrupt database synchronization on some platforms.

D:

Faster failure notification can reduce convergence latency. Here, however, incompatible MTUs can interrupt database synchronization on some platforms.

Question 505

A new OSPF routed uplink has a different MTU at each end and neighbor exchange stalls. Which observation would best verify that the intended behavior is working?

  1. Trace source gateway, route lookup and a permitted destination test
  2. Inspect neighbor transitions and interface MTU during exchange
  3. Probe permitted DNS and denied server flows while reviewing imported VRF routes
  4. Trace a test session in both directions and check the destination route table

Explanation

Correct Answer

B:

State and MTU evidence distinguish database failure from loss of hello packets. Incompatible MTUs can interrupt database synchronization on some platforms.

Incorrect Answers

A:

Working local VLAN membership alone does not establish inter-subnet forwarding. By contrast, state and MTU evidence distinguish database failure from loss of hello packets.

C:

Both results confirm correct import scope. It would not resolve the documented symptom; state and MTU evidence distinguish database failure from loss of hello packets.

D:

The missing return entry reveals why clients see timeouts. In this situation, state and MTU evidence distinguish database failure from loss of hello packets.

Question 506

A new OSPF routed uplink has a different MTU at each end and neighbor exchange stalls. Which belief about the configuration should the team reject?

  1. Change the access VLAN tag repeatedly even though the branch forward path is confirmed
  2. Assume adding more areas automatically reduces traffic without configuring inter-area connectivity
  3. Change BGP local preference to repair OSPF database-description rejection
  4. Assume an OSPF interface staying up proves the remote internet service is healthy

Explanation

Correct Answer

C:

BGP attributes are unrelated to OSPF MTU negotiation. Incompatible MTUs can interrupt database synchronization on some platforms.

Incorrect Answers

A:

VLAN changes do not create a missing upstream route. It would not resolve the documented symptom; bGP attributes are unrelated to OSPF MTU negotiation.

B:

Areas need correct backbone relationships and route advertisement. The relevant technical distinction is that bGP attributes are unrelated to OSPF MTU negotiation.

D:

Local carrier status cannot see farther upstream faults. By contrast, bGP attributes are unrelated to OSPF MTU negotiation.

Question 507

A new OSPF routed uplink has a different MTU at each end and neighbor exchange stalls. What should be included in the rollout plan to limit a foreseeable failure?

  1. Document resolver dependencies and request owner review of future shared routes
  2. Test routed packet size after aligning the MTU
  3. Review overlapping prefixes and preserve rollback if a dependent application remains
  4. Require security approval and a documented import list for any cross-VRF route

Explanation

Correct Answer

B:

A stable neighbor does not alone guarantee application transport. State and MTU evidence distinguish database failure from loss of hello packets.

Incorrect Answers

A:

A minimal import list is easier to audit. By contrast, a stable neighbor does not alone guarantee application transport.

C:

A single static exception may still be needed for a legacy service. The relevant technical distinction is that a stable neighbor does not alone guarantee application transport.

D:

Exceptions must not silently expand administrative reach. Here, however, a stable neighbor does not alone guarantee application transport.

Question 508

A routing change makes a management VRF unexpectedly able to reach a guest subnet. What should the network engineer do to address this requirement?

  1. Correct route import/export rules and preserve the intended default per context
  2. Remove or adjust the stale more-specific route after verifying the migration plan
  3. Remove unintended route leaking and restrict the affected inter-VRF policy
  4. Evaluate supported BFD with compatible peer intervals and a controlled change plan

Explanation

Correct Answer

C:

Independent VRFs require deliberate imports to preserve trust boundaries. Routing isolation must be tested on actual source and destination pairs.

Incorrect Answers

A:

Imported defaults can redirect trusted traffic toward a less controlled network. The relevant technical distinction is that independent VRFs require deliberate imports to preserve trust boundaries.

B:

Longest-prefix match can keep sending traffic to the old router. Here, however, independent VRFs require deliberate imports to preserve trust boundaries.

D:

Faster failure notification can reduce convergence latency. In this situation, independent VRFs require deliberate imports to preserve trust boundaries.

Question 509

A routing change makes a management VRF unexpectedly able to reach a guest subnet. What should the team inspect to confirm the result?

  1. Check the actual advertised-route table and confirm peer acceptance
  2. Inspect both VRF tables and prove a denied guest-management session is blocked
  3. Compare multiple traffic flows and next-hop byte counters during the same period
  4. Induce upstream loss and verify the failed route is withdrawn and backup installed

Explanation

Correct Answer

B:

Routing isolation must be tested on actual source and destination pairs. Independent VRFs require deliberate imports to preserve trust boundaries.

Incorrect Answers

A:

Live advertisements prove what leaves the organization. It would not resolve the documented symptom; routing isolation must be tested on actual source and destination pairs.

C:

Flow-level evidence explains imbalance better than one speed test. In this situation, routing isolation must be tested on actual source and destination pairs.

D:

A controlled fault demonstrates correct preference change. Here, however, routing isolation must be tested on actual source and destination pairs.

Question 510

A routing change makes a management VRF unexpectedly able to reach a guest subnet. Which misconception is most likely to obstruct a correct fix?

  1. Assume one large TCP flow must be split evenly across every ECMP next hop
  2. Adjust the new core's interface bandwidth and assume the shorter prefix becomes preferred
  3. Assume different VRF names alone prevent all communication after explicit routes are imported
  4. Set local preference internally and assume it is advertised to every outside provider

Explanation

Correct Answer

C:

Route leaking can join otherwise isolated contexts. Independent VRFs require deliberate imports to preserve trust boundaries.

Incorrect Answers

A:

Ordinary per-flow balancing can keep that connection on a single path. By contrast, route leaking can join otherwise isolated contexts.

B:

Link speed does not override destination specificity. It would not resolve the documented symptom; route leaking can join otherwise isolated contexts.

D:

Local preference is not a universal eBGP inbound steering mechanism. In this situation, route leaking can join otherwise isolated contexts.

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

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