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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.
- Document growth targets and validate area-boundary reachability
- Test routed packet size after aligning the MTU
- Inspect area membership and LSDB size before and after the change
- Apply a reviewed inbound prefix list or route-map filter for that neighbor
- Design an appropriate area hierarchy and summarize where supported
- 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?
- Inspect area membership and LSDB size before and after the change
- Induce upstream loss and verify the failed route is withdrawn and backup installed
- Compare multiple traffic flows and next-hop byte counters during the same period
- 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?
- Change BGP local preference to repair OSPF database-description rejection
- Tune local preference before confirming the BGP TCP session can open
- Assume adding more areas automatically reduces traffic without configuring inter-area connectivity
- 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?
- Document growth targets and validate area-boundary reachability
- Maintain a reviewed route-leak matrix and regression tests
- Capacity-plan for hash skew and a full single-link failure
- 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?
- Align the supported interface MTU and review OSPF database exchange diagnostics
- Configure appropriate IPv6 router advertisements on the routed campus interface
- Review administrative distance and route preference while preserving required policy
- 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?
- Trace source gateway, route lookup and a permitted destination test
- Inspect neighbor transitions and interface MTU during exchange
- Probe permitted DNS and denied server flows while reviewing imported VRF routes
- 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?
- Change the access VLAN tag repeatedly even though the branch forward path is confirmed
- Assume adding more areas automatically reduces traffic without configuring inter-area connectivity
- Change BGP local preference to repair OSPF database-description rejection
- 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?
- Document resolver dependencies and request owner review of future shared routes
- Test routed packet size after aligning the MTU
- Review overlapping prefixes and preserve rollback if a dependent application remains
- 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?
- Correct route import/export rules and preserve the intended default per context
- Remove or adjust the stale more-specific route after verifying the migration plan
- Remove unintended route leaking and restrict the affected inter-VRF policy
- 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?
- Check the actual advertised-route table and confirm peer acceptance
- Inspect both VRF tables and prove a denied guest-management session is blocked
- Compare multiple traffic flows and next-hop byte counters during the same period
- 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?
- Assume one large TCP flow must be split evenly across every ECMP next hop
- Adjust the new core's interface bandwidth and assume the shorter prefix becomes preferred
- Assume different VRF names alone prevent all communication after explicit routes are imported
- 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