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Question 530
An organization wants external networks to prefer one inbound campus internet circuit. Which belief about the configuration should the team reject?
- Set local preference internally and assume it is advertised to every outside provider
- Assume changing OSPF cost will override a more specific static prefix automatically
- Assume different VRF names alone prevent all communication after explicit routes are imported
- Assume IPv6 DHCP options alone necessarily supply the default route in all implementations
Explanation
Correct Answer
A:Local preference is not a universal eBGP inbound steering mechanism. Export attributes can influence external routing decisions subject to peer policy.
Incorrect Answers
B:Prefix length is evaluated before comparing routes to a different prefix. It would not resolve the documented symptom; local preference is not a universal eBGP inbound steering mechanism.
C:Route leaking can join otherwise isolated contexts. In this situation, local preference is not a universal eBGP inbound steering mechanism.
D:Default-router discovery is commonly RA-based. By contrast, local preference is not a universal eBGP inbound steering mechanism.
Question 531
An organization wants external networks to prefer one inbound campus internet circuit. What should be included in the rollout plan to limit a foreseeable failure?
- Validate inbound failover and provider filtering before changing advertisements
- Require security approval and a documented import list for any cross-VRF route
- Document resolver dependencies and request owner review of future shared routes
- Review all affected gateway route tables before adding another branch
Explanation
Correct Answer
A:Traffic engineering can be affected by external policies. Local configuration does not guarantee how third-party ASes choose routes.
Incorrect Answers
B:Exceptions must not silently expand administrative reach. By contrast, traffic engineering can be affected by external policies.
C:A minimal import list is easier to audit. It would not resolve the documented symptom; traffic engineering can be affected by external policies.
D:Route completeness should be tested as part of expansion. The relevant technical distinction is that traffic engineering can be affected by external policies.
Question 532
A school uses two VRFs and accidentally installs a default route from the guest VRF into the staff VRF. What should the network engineer do to address this requirement?
- Remove unintended route leaking and restrict the affected inter-VRF policy
- Correct route import/export rules and preserve the intended default per context
- Ensure each loopback has valid underlay reachability and the intended source address
- Advertise a conditional or monitored default route using a supported mechanism
Explanation
Correct Answer
B:Imported defaults can redirect trusted traffic toward a less controlled network. The forwarding table shows the impact of a leaked route.
Incorrect Answers
A:Independent VRFs require deliberate imports to preserve trust boundaries. Here, however, imported defaults can redirect trusted traffic toward a less controlled network.
C:Stable BGP endpoint identity still depends on forwarding routes. The relevant technical distinction is that imported defaults can redirect trusted traffic toward a less controlled network.
D:The default should not persist when the upstream exit is unavailable. By contrast, imported defaults can redirect trusted traffic toward a less controlled network.
Question 533
A school uses two VRFs and accidentally installs a default route from the guest VRF into the staff VRF. What should the team inspect to confirm the result?
- Measure BFD state, OSPF withdrawal and next-hop replacement during induced loss
- Compare multiple traffic flows and next-hop byte counters during the same period
- Compare link-state database entries, route filters and installed prefixes
- Inspect each VRF's active default and trace a staff internet flow
Explanation
Correct Answer
D:The forwarding table shows the impact of a leaked route. Imported defaults can redirect trusted traffic toward a less controlled network.
Incorrect Answers
A:The sequence shows actual recovery time rather than a configured timer. The relevant technical distinction is that the forwarding table shows the impact of a leaked route.
B:Flow-level evidence explains imbalance better than one speed test. In this situation, the forwarding table shows the impact of a leaked route.
C:The evidence distinguishes omitted advertisement from route preference. Here, however, the forwarding table shows the impact of a leaked route.
Question 534
A school uses two VRFs and accidentally installs a default route from the guest VRF into the staff VRF. Which misconception is most likely to obstruct a correct fix?
- Assume the staff firewall policy alone prevents every routing mistake after default import
- Set OSPF hello and dead timers to arbitrary very low values without peer coordination
- Assume a healthy physical uplink means hello packets cross the correct VLAN
- Set local preference internally and assume it is advertised to every outside provider
Explanation
Correct Answer
A:A wrong route can still disrupt or misroute permitted traffic. Imported defaults can redirect trusted traffic toward a less controlled network.
Incorrect Answers
B:Unsupported aggressive timers can flap healthy adjacencies. Here, however, a wrong route can still disrupt or misroute permitted traffic.
C:Mis-tagging can isolate the routed interfaces. It would not resolve the documented symptom; a wrong route can still disrupt or misroute permitted traffic.
D:Local preference is not a universal eBGP inbound steering mechanism. In this situation, a wrong route can still disrupt or misroute permitted traffic.
Question 535
A school uses two VRFs and accidentally installs a default route from the guest VRF into the staff VRF. What precaution is most important before the change is expanded?
- Verify loss tolerance before enabling aggressive detection on production links
- Validate approved prefixes and loop-prevention behavior before enabling new boundaries
- Maintain a reviewed route-leak matrix and regression tests
- Require an address-owner sign-off before changing exported prefixes
Explanation
Correct Answer
C:Shared changes should not contaminate isolated routing tables. The forwarding table shows the impact of a leaked route.
Incorrect Answers
A:BFD settings must not convert transient jitter into route outages. In this situation, shared changes should not contaminate isolated routing tables.
B:A small filter error can affect multiple sites. It would not resolve the documented symptom; shared changes should not contaminate isolated routing tables.
D:New routes should not expand external reachability without approval. By contrast, shared changes should not contaminate isolated routing tables.
Question 536
A routed switch uses ECMP over two upstream links but one becomes overloaded while the other stays light. Which configuration decision most directly resolves the situation?
- Align the intended area and relevant authentication/hello settings
- Examine ECMP hashing and the number of distinct active flows
- Align the supported interface MTU and review OSPF database exchange diagnostics
- Use an approved tracked-route or dynamic failover design based on real reachability
Explanation
Correct Answer
B:Per-flow hashing may distribute connections unevenly despite equal-cost routes. Flow-level evidence explains imbalance better than one speed test.
Incorrect Answers
A:OSPF peers require matching area membership before adjacency. The relevant technical distinction is that per-flow hashing may distribute connections unevenly despite equal-cost routes.
C:Incompatible MTUs can interrupt database synchronization on some platforms. By contrast, per-flow hashing may distribute connections unevenly despite equal-cost routes.
D:Interface carrier is not proof that a remote service path works. It would not resolve the documented symptom; per-flow hashing may distribute connections unevenly despite equal-cost routes.
Question 537
A routed switch uses ECMP over two upstream links but one becomes overloaded while the other stays light. Which check most directly demonstrates the desired network behavior?
- Compare multiple traffic flows and next-hop byte counters during the same period
- Inspect advertised attributes and verify observed remote path preference
- Inspect both VRF tables and prove a denied guest-management session is blocked
- Inspect neighbor state, network type and hello parameters on both switches
Explanation
Correct Answer
A:Flow-level evidence explains imbalance better than one speed test. Per-flow hashing may distribute connections unevenly despite equal-cost routes.
Incorrect Answers
B:Local configuration does not guarantee how third-party ASes choose routes. The relevant technical distinction is that flow-level evidence explains imbalance better than one speed test.
C:Routing isolation must be tested on actual source and destination pairs. By contrast, flow-level evidence explains imbalance better than one speed test.
D:Peer-level evidence reveals incompatible adjacency expectations. Here, however, flow-level evidence explains imbalance better than one speed test.
Question 538
A routed switch uses ECMP over two upstream links but one becomes overloaded while the other stays light. Which assumption would be most misleading when investigating this situation?
- Assume different VRF names alone prevent all communication after explicit routes are imported
- Tune local preference before confirming the BGP TCP session can open
- Assume one large TCP flow must be split evenly across every ECMP next hop
- Set local preference internally and assume it is advertised to every outside provider
Explanation
Correct Answer
C:Ordinary per-flow balancing can keep that connection on a single path. Per-flow hashing may distribute connections unevenly despite equal-cost routes.
Incorrect Answers
A:Route leaking can join otherwise isolated contexts. The relevant technical distinction is that ordinary per-flow balancing can keep that connection on a single path.
B:Route attributes matter only after the session exchanges routes. In this situation, ordinary per-flow balancing can keep that connection on a single path.
D:Local preference is not a universal eBGP inbound steering mechanism. Here, however, ordinary per-flow balancing can keep that connection on a single path.
Question 539
A routed switch uses ECMP over two upstream links but one becomes overloaded while the other stays light. Which safeguard best reduces the deployment risk in this case?
- Review overlapping prefixes and preserve rollback if a dependent application remains
- Capacity-plan for hash skew and a full single-link failure
- Require security approval and a documented import list for any cross-VRF route
- Define backup default sources and convergence targets for outages
Explanation
Correct Answer
B:Effective redundancy requires enough surviving bandwidth. Flow-level evidence explains imbalance better than one speed test.
Incorrect Answers
A:A single static exception may still be needed for a legacy service. In this situation, effective redundancy requires enough surviving bandwidth.
C:Exceptions must not silently expand administrative reach. Here, however, effective redundancy requires enough surviving bandwidth.
D:Internet redundancy requires predictable route withdrawal. It would not resolve the documented symptom; effective redundancy requires enough surviving bandwidth.
Question 540
A campus routing team wants faster OSPF failure detection over a fiber interconnect. What is the most appropriate first technical change?
- Verify both transit VLAN reachability and consistent OSPF interface settings
- Use an appropriate internal BGP path-preference policy and inspect best-path selection
- Align the supported interface MTU and review OSPF database exchange diagnostics
- Evaluate supported BFD with compatible peer intervals and a controlled change plan
Explanation
Correct Answer
D:Faster failure notification can reduce convergence latency. The sequence shows actual recovery time rather than a configured timer.
Incorrect Answers
A:Protocol adjacency requires both Layer 2 transport and compatible routing configuration. It would not resolve the documented symptom; faster failure notification can reduce convergence latency.
B:Local BGP attributes can steer the campus's own egress preference. By contrast, faster failure notification can reduce convergence latency.
C:Incompatible MTUs can interrupt database synchronization on some platforms. In this situation, faster failure notification can reduce convergence latency.
HPE Network Campus Access Professional (HPE7-A01) Practice Tests
