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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.
Question 511
A routing change makes a management VRF unexpectedly able to reach a guest subnet. What precaution is most important before the change is expanded?
- Require security approval and a documented import list for any cross-VRF route
- Block unauthorized RAs on access ports while preserving the approved router
- Capacity-plan for hash skew and a full single-link failure
- Validate approved prefixes and loop-prevention behavior before enabling new boundaries
Explanation
Correct Answer
A:Exceptions must not silently expand administrative reach. Routing isolation must be tested on actual source and destination pairs.
Incorrect Answers
B:Dual-stack networks need control of rogue IPv6 gateways. The relevant technical distinction is that exceptions must not silently expand administrative reach.
C:Effective redundancy requires enough surviving bandwidth. It would not resolve the documented symptom; exceptions must not silently expand administrative reach.
D:A small filter error can affect multiple sites. By contrast, exceptions must not silently expand administrative reach.
Question 512
A campus runs eBGP between two administrative domains but the neighbor never becomes Established. Which configuration decision most directly resolves the situation?
- Apply a reviewed inbound prefix list or route-map filter for that neighbor
- Verify TCP reachability, peer IP addresses, AS numbers and authentication where used
- Check network type, DR/BDR behavior and compatible OSPF interface settings
- Ensure each loopback has valid underlay reachability and the intended source address
Explanation
Correct Answer
B:A BGP session needs transport and compatible neighboring identities. Peering diagnostics distinguish transport failure from path-policy errors.
Incorrect Answers
A:Import policy prevents unwanted external reachability information. By contrast, a BGP session needs transport and compatible neighboring identities.
C:Adjacency state depends on the link type and protocol roles. The relevant technical distinction is that a BGP session needs transport and compatible neighboring identities.
D:Stable BGP endpoint identity still depends on forwarding routes. Here, however, a BGP session needs transport and compatible neighboring identities.
Question 513
A campus runs eBGP between two administrative domains but the neighbor never becomes Established. Which check most directly demonstrates the desired network behavior?
- Probe permitted DNS and denied server flows while reviewing imported VRF routes
- Compare destination lookups for addresses within and outside the old prefix
- Inspect neighbor state, TCP errors and local/remote AS configuration
- Trace a test session in both directions and check the destination route table
Explanation
Correct Answer
C:Peering diagnostics distinguish transport failure from path-policy errors. A BGP session needs transport and compatible neighboring identities.
Incorrect Answers
A:Both results confirm correct import scope. The relevant technical distinction is that peering diagnostics distinguish transport failure from path-policy errors.
B:Different route lengths can create partial outages. In this situation, peering diagnostics distinguish transport failure from path-policy errors.
D:The missing return entry reveals why clients see timeouts. Here, however, peering diagnostics distinguish transport failure from path-policy errors.
Question 514
A campus runs eBGP between two administrative domains but the neighbor never becomes Established. Which assumption would be most misleading when investigating this situation?
- Tune local preference before confirming the BGP TCP session can open
- Increase every VLAN's spanning-tree priority to repair Layer 3 route feedback
- Assume a loopback address remains reachable even when every physical underlay path fails
- Set OSPF hello and dead timers to arbitrary very low values without peer coordination
Explanation
Correct Answer
A:Route attributes matter only after the session exchanges routes. A BGP session needs transport and compatible neighboring identities.
Incorrect Answers
B:STP does not govern the route redistribution process. It would not resolve the documented symptom; route attributes matter only after the session exchanges routes.
C:Virtual addresses still need physical network connectivity. Here, however, route attributes matter only after the session exchanges routes.
D:Unsupported aggressive timers can flap healthy adjacencies. In this situation, route attributes matter only after the session exchanges routes.
Question 515
A campus runs eBGP between two administrative domains but the neighbor never becomes Established. Which safeguard best reduces the deployment risk in this case?
- Limit permitted prefixes and authenticate the boundary where supported
- Document resolver dependencies and request owner review of future shared routes
- Require security approval and a documented import list for any cross-VRF route
- Review all affected gateway route tables before adding another branch
Explanation
Correct Answer
A:Successful peering must not imply unrestricted route exchange. Peering diagnostics distinguish transport failure from path-policy errors.
Incorrect Answers
B:A minimal import list is easier to audit. In this situation, successful peering must not imply unrestricted route exchange.
C:Exceptions must not silently expand administrative reach. By contrast, successful peering must not imply unrestricted route exchange.
D:Route completeness should be tested as part of expansion. It would not resolve the documented symptom; successful peering must not imply unrestricted route exchange.
Question 516
A BGP provider advertises a route that should not enter a campus network. What is the most appropriate first technical change?
- Tie default origination to actual egress reachability or withdraw it during failure
- Configure appropriate IPv6 router advertisements on the routed campus interface
- Coordinate a supported BGP advertisement strategy such as controlled AS-path prepending
- Apply a reviewed inbound prefix list or route-map filter for that neighbor
Explanation
Correct Answer
D:Import policy prevents unwanted external reachability information. The differences establish whether the unauthorized route was rejected.
Incorrect Answers
A:Protocol advertisement should reflect a working outside path. It would not resolve the documented symptom; import policy prevents unwanted external reachability information.
B:Clients typically learn IPv6 default-router information from RAs. The relevant technical distinction is that import policy prevents unwanted external reachability information.
C:Export attributes can influence external routing decisions subject to peer policy. By contrast, import policy prevents unwanted external reachability information.
Question 517
A BGP provider advertises a route that should not enter a campus network. Which observation would best verify that the intended behavior is working?
- Compare received, accepted and installed prefixes after the filter
- Inspect both VRF tables and prove a denied guest-management session is blocked
- Inspect hello packets and neighbor logs for area mismatch
- Capture hello traffic and inspect interface VLAN tagging and OSPF logs
Explanation
Correct Answer
A:The differences establish whether the unauthorized route was rejected. Import policy prevents unwanted external reachability information.
Incorrect Answers
B:Routing isolation must be tested on actual source and destination pairs. The relevant technical distinction is that the differences establish whether the unauthorized route was rejected.
C:A direct capture identifies the advertised area values. Here, however, the differences establish whether the unauthorized route was rejected.
D:The evidence separates missing frames from protocol mismatch. By contrast, the differences establish whether the unauthorized route was rejected.
Question 518
A BGP provider advertises a route that should not enter a campus network. Which belief about the configuration should the team reject?
- Import the entire server VRF into every client VRF to simplify name resolution
- Assume an Established neighbor makes all its advertised networks trustworthy
- Change the access VLAN tag repeatedly even though the branch forward path is confirmed
- Assume a healthy physical uplink means hello packets cross the correct VLAN
Explanation
Correct Answer
B:BGP session health does not validate every prefix. Import policy prevents unwanted external reachability information.
Incorrect Answers
A:Overbroad route leaking expands lateral reachability. In this situation, bGP session health does not validate every prefix.
C:VLAN changes do not create a missing upstream route. The relevant technical distinction is that bGP session health does not validate every prefix.
D:Mis-tagging can isolate the routed interfaces. Here, however, bGP session health does not validate every prefix.
Question 519
A BGP provider advertises a route that should not enter a campus network. What should be included in the rollout plan to limit a foreseeable failure?
- Capacity-plan for hash skew and a full single-link failure
- Review the permitted subnet inventory before broadening OSPF redistribution
- Coordinate the area change across both sides and validate failover routes
- Set maximum-prefix alerts and log denied-route changes
Explanation
Correct Answer
D:A route leak can overwhelm or misdirect the campus quickly. The differences establish whether the unauthorized route was rejected.
Incorrect Answers
A:Effective redundancy requires enough surviving bandwidth. Here, however, a route leak can overwhelm or misdirect the campus quickly.
B:Route leakage can expose management or guest networks. In this situation, a route leak can overwhelm or misdirect the campus quickly.
C:One-sided routing changes can cause temporary loss of reachability. It would not resolve the documented symptom; a route leak can overwhelm or misdirect the campus quickly.
Question 520
An enterprise must advertise only its approved public campus prefixes to an upstream BGP neighbor. Which TWO actions together implement the required change and verify that it works? Choose TWO.
- Define backup default sources and convergence targets for outages
- Coordinate a supported BGP advertisement strategy such as controlled AS-path prepending
- Check the actual advertised-route table and confirm peer acceptance
- Evaluate supported BFD with compatible peer intervals and a controlled change plan
- Use an explicit outbound export filter for the eBGP session
Explanation
Correct Answers
C:Live advertisements prove what leaves the organization. Export boundaries protect internal subnets from accidental public announcement.
E:Export boundaries protect internal subnets from accidental public announcement. Live advertisements prove what leaves the organization.
Incorrect Answers
A:Internet redundancy requires predictable route withdrawal. It would not resolve the documented symptom; new routes should not expand external reachability without approval.
B:Export attributes can influence external routing decisions subject to peer policy. By contrast, export boundaries protect internal subnets from accidental public announcement.
D:Faster failure notification can reduce convergence latency. In this situation, export boundaries protect internal subnets from accidental public announcement.
HPE Network Campus Access Professional (HPE7-A01) Practice Tests