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Question 550
A campus has multiple OSPF exit routers, but an upstream outage leaves a dead default route advertised. Which assumption would be most misleading when investigating this situation?
- Assume an OSPF interface staying up proves the remote internet service is healthy
- Assume different VRF names alone prevent all communication after explicit routes are imported
- Tune local preference before confirming the BGP TCP session can open
- Change BGP local preference to repair OSPF database-description rejection
Explanation
Correct Answer
A:Local carrier status cannot see farther upstream faults. Protocol advertisement should reflect a working outside path.
Incorrect Answers
B:Route leaking can join otherwise isolated contexts. By contrast, local carrier status cannot see farther upstream faults.
C:Route attributes matter only after the session exchanges routes. It would not resolve the documented symptom; local carrier status cannot see farther upstream faults.
D:BGP attributes are unrelated to OSPF MTU negotiation. In this situation, local carrier status cannot see farther upstream faults.
Question 551
A campus has multiple OSPF exit routers, but an upstream outage leaves a dead default route advertised. Which safeguard best reduces the deployment risk in this case?
- Run outside-reachability probes and test backup egress during cutover
- Capacity-plan for hash skew and a full single-link failure
- Document which source is authoritative before changing distance globally
- Document resolver dependencies and request owner review of future shared routes
Explanation
Correct Answer
A:Resilient default routing must account for remote failures. Withdrawal and alternate route selection demonstrate recovery.
Incorrect Answers
B:Effective redundancy requires enough surviving bandwidth. The relevant technical distinction is that resilient default routing must account for remote failures.
C:A blanket change can redirect many unrelated prefixes. It would not resolve the documented symptom; resilient default routing must account for remote failures.
D:A minimal import list is easier to audit. By contrast, resilient default routing must account for remote failures.
Question 552
A network migrates to IPv6 and switches advertise addresses but hosts do not receive the expected default router. What is the most appropriate first technical change?
- Use an explicit outbound export filter for the eBGP session
- Configure appropriate IPv6 router advertisements on the routed campus interface
- Align the supported interface MTU and review OSPF database exchange diagnostics
- Apply a reviewed inbound prefix list or route-map filter for that neighbor
Explanation
Correct Answer
B:Clients typically learn IPv6 default-router information from RAs. The actual messages reveal whether route discovery is succeeding.
Incorrect Answers
A:Export boundaries protect internal subnets from accidental public announcement. By contrast, clients typically learn IPv6 default-router information from RAs.
C:Incompatible MTUs can interrupt database synchronization on some platforms. The relevant technical distinction is that clients typically learn IPv6 default-router information from RAs.
D:Import policy prevents unwanted external reachability information. Here, however, clients typically learn IPv6 default-router information from RAs.
Question 553
A network migrates to IPv6 and switches advertise addresses but hosts do not receive the expected default router. Which observation would best verify that the intended behavior is working?
- Compare multiple traffic flows and next-hop byte counters during the same period
- Capture RA contents and inspect client default-router entries
- Trace a test session in both directions and check the destination route table
- Probe permitted DNS and denied server flows while reviewing imported VRF routes
Explanation
Correct Answer
B:The actual messages reveal whether route discovery is succeeding. Clients typically learn IPv6 default-router information from RAs.
Incorrect Answers
A:Flow-level evidence explains imbalance better than one speed test. The relevant technical distinction is that the actual messages reveal whether route discovery is succeeding.
C:The missing return entry reveals why clients see timeouts. In this situation, the actual messages reveal whether route discovery is succeeding.
D:Both results confirm correct import scope. Here, however, the actual messages reveal whether route discovery is succeeding.
Question 554
A network migrates to IPv6 and switches advertise addresses but hosts do not receive the expected default router. Which belief about the configuration should the team reject?
- Redistribute every connected VLAN into eBGP to avoid missing a subnet
- Assume IPv6 DHCP options alone necessarily supply the default route in all implementations
- Set local preference internally and assume it is advertised to every outside provider
- Increase administrative distance to force a router to enter Full state
Explanation
Correct Answer
B:Default-router discovery is commonly RA-based. Clients typically learn IPv6 default-router information from RAs.
Incorrect Answers
A:This can disclose private guest and management networks. In this situation, default-router discovery is commonly RA-based.
C:Local preference is not a universal eBGP inbound steering mechanism. It would not resolve the documented symptom; default-router discovery is commonly RA-based.
D:Route preference cannot repair neighbor negotiation. Here, however, default-router discovery is commonly RA-based.
Question 555
A network migrates to IPv6 and switches advertise addresses but hosts do not receive the expected default router. What should be included in the rollout plan to limit a foreseeable failure?
- Capacity-plan for hash skew and a full single-link failure
- Test failure of the preferred carrier and verify the alternate route takes over
- Block unauthorized RAs on access ports while preserving the approved router
- Verify loss tolerance before enabling aggressive detection on production links
Explanation
Correct Answer
C:Dual-stack networks need control of rogue IPv6 gateways. The actual messages reveal whether route discovery is succeeding.
Incorrect Answers
A:Effective redundancy requires enough surviving bandwidth. It would not resolve the documented symptom; dual-stack networks need control of rogue IPv6 gateways.
B:A preference policy should not eliminate internet resilience. In this situation, dual-stack networks need control of rogue IPv6 gateways.
D:BFD settings must not convert transient jitter into route outages. By contrast, dual-stack networks need control of rogue IPv6 gateways.
Question 556
A branch's route table contains a specific path via an old router and a new broad path via a new core. What should the network engineer do to address this requirement?
- Add the authorized return route or dynamic routing advertisement on the distribution layer
- Remove or adjust the stale more-specific route after verifying the migration plan
- Remove unintended route leaking and restrict the affected inter-VRF policy
- Review administrative distance and route preference while preserving required policy
Explanation
Correct Answer
B:Longest-prefix match can keep sending traffic to the old router. Different route lengths can create partial outages.
Incorrect Answers
A:Successful forward traffic still requires a usable return path. By contrast, longest-prefix match can keep sending traffic to the old router.
C:Independent VRFs require deliberate imports to preserve trust boundaries. It would not resolve the documented symptom; longest-prefix match can keep sending traffic to the old router.
D:Different routing sources can compete for the same destination prefix. The relevant technical distinction is that longest-prefix match can keep sending traffic to the old router.
Question 557
A branch's route table contains a specific path via an old router and a new broad path via a new core. What should the team inspect to confirm the result?
- Capture hello traffic and inspect interface VLAN tagging and OSPF logs
- Inspect neighbor state, network type and hello parameters on both switches
- Check source address, loopback reachability and established peer state
- Compare destination lookups for addresses within and outside the old prefix
Explanation
Correct Answer
D:Different route lengths can create partial outages. Longest-prefix match can keep sending traffic to the old router.
Incorrect Answers
A:The evidence separates missing frames from protocol mismatch. By contrast, different route lengths can create partial outages.
B:Peer-level evidence reveals incompatible adjacency expectations. Here, however, different route lengths can create partial outages.
C:A functioning TCP route proves the peering's transport dependency. The relevant technical distinction is that different route lengths can create partial outages.
Question 558
A branch's route table contains a specific path via an old router and a new broad path via a new core. Which misconception is most likely to obstruct a correct fix?
- Set local preference internally and assume it is advertised to every outside provider
- Tune local preference before confirming the BGP TCP session can open
- 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
Explanation
Correct Answer
C:Link speed does not override destination specificity. Longest-prefix match can keep sending traffic to the old router.
Incorrect Answers
A:Local preference is not a universal eBGP inbound steering mechanism. Here, however, link speed does not override destination specificity.
B:Route attributes matter only after the session exchanges routes. In this situation, link speed does not override destination specificity.
D:Route leaking can join otherwise isolated contexts. The relevant technical distinction is that link speed does not override destination specificity.
Question 559
A branch's route table contains a specific path via an old router and a new broad path via a new core. What precaution is most important before the change is expanded?
- Capacity-plan for hash skew and a full single-link failure
- Verify loss tolerance before enabling aggressive detection on production links
- Test the secondary underlay and document recursive routing dependencies
- Review overlapping prefixes and preserve rollback if a dependent application remains
Explanation
Correct Answer
D:A single static exception may still be needed for a legacy service. Different route lengths can create partial outages.
Incorrect Answers
A:Effective redundancy requires enough surviving bandwidth. Here, however, a single static exception may still be needed for a legacy service.
B:BFD settings must not convert transient jitter into route outages. In this situation, a single static exception may still be needed for a legacy service.
C:A failover route should preserve loopback connectivity. It would not resolve the documented symptom; a single static exception may still be needed for a legacy service.
Question 560
A network engineer sees a route in the BGP table but not in the forwarding table. Which configuration decision most directly resolves the situation?
- Use an appropriate internal BGP path-preference policy and inspect best-path selection
- Inspect reciprocal static/dynamic routes and correct the forwarding cycle
- Check next-hop resolution, best-path flags and competing route distance
- Check network type, DR/BDR behavior and compatible OSPF interface settings
Explanation
Correct Answer
C:Received control-plane information may not become the installed route. The lookup reveals why one candidate cannot be used.
Incorrect Answers
A:Local BGP attributes can steer the campus's own egress preference. In this situation, received control-plane information may not become the installed route.
B:Mutually pointing defaults can circulate packets until their TTL expires. It would not resolve the documented symptom; received control-plane information may not become the installed route.
D:Adjacency state depends on the link type and protocol roles. By contrast, received control-plane information may not become the installed route.
HPE Network Campus Access Professional (HPE7-A01) Practice Tests
