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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.
Question 521
An enterprise must advertise only its approved public campus prefixes to an upstream BGP neighbor. What should the team inspect to confirm the result?
- Probe permitted DNS and denied server flows while reviewing imported VRF routes
- 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
Explanation
Correct Answer
B:Live advertisements prove what leaves the organization. Export boundaries protect internal subnets from accidental public announcement.
Incorrect Answers
A:Both results confirm correct import scope. The relevant technical distinction is that live advertisements prove what leaves the organization.
C:Routing isolation must be tested on actual source and destination pairs. It would not resolve the documented symptom; live advertisements prove what leaves the organization.
D:Flow-level evidence explains imbalance better than one speed test. By contrast, live advertisements prove what leaves the organization.
Question 522
An enterprise must advertise only its approved public campus prefixes to an upstream BGP neighbor. Which misconception is most likely to obstruct a correct fix?
- Increase every VLAN's spanning-tree priority to repair Layer 3 route feedback
- Assume IPv6 DHCP options alone necessarily supply the default route in all implementations
- Assume OSPF always wins over every static route regardless of configured distance
- Redistribute every connected VLAN into eBGP to avoid missing a subnet
Explanation
Correct Answer
D:This can disclose private guest and management networks. Export boundaries protect internal subnets from accidental public announcement.
Incorrect Answers
A:STP does not govern the route redistribution process. Here, however, this can disclose private guest and management networks.
B:Default-router discovery is commonly RA-based. By contrast, this can disclose private guest and management networks.
C:Lower-distance static routes may remain preferred. The relevant technical distinction is that this can disclose private guest and management networks.
Question 523
An enterprise must advertise only its approved public campus prefixes to an upstream BGP neighbor. What precaution is most important before the change is expanded?
- Review all affected gateway route tables before adding another branch
- Test destinations inside and outside the overlapping ranges after migration
- Require an address-owner sign-off before changing exported prefixes
- Maintain a reviewed route-leak matrix and regression tests
Explanation
Correct Answer
C:New routes should not expand external reachability without approval. Live advertisements prove what leaves the organization.
Incorrect Answers
A:Route completeness should be tested as part of expansion. The relevant technical distinction is that new routes should not expand external reachability without approval.
B:A fix for one host must not blackhole adjacent subnets. In this situation, new routes should not expand external reachability without approval.
D:Shared changes should not contaminate isolated routing tables. Here, however, new routes should not expand external reachability without approval.
Question 524
A campus has two eBGP providers and wants one preferred for outbound internet traffic. Which configuration decision most directly resolves the situation?
- Verify TCP reachability, peer IP addresses, AS numbers and authentication where used
- Configure appropriate IPv6 router advertisements on the routed campus interface
- Use an appropriate internal BGP path-preference policy and inspect best-path selection
- Check next-hop resolution, best-path flags and competing route distance
Explanation
Correct Answer
C:Local BGP attributes can steer the campus's own egress preference. The preferred route must actually be installed.
Incorrect Answers
A:A BGP session needs transport and compatible neighboring identities. It would not resolve the documented symptom; local BGP attributes can steer the campus's own egress preference.
B:Clients typically learn IPv6 default-router information from RAs. In this situation, local BGP attributes can steer the campus's own egress preference.
D:Received control-plane information may not become the installed route. Here, however, local BGP attributes can steer the campus's own egress preference.
Question 525
A campus has two eBGP providers and wants one preferred for outbound internet traffic. Which check most directly demonstrates the desired network behavior?
- Compare path attributes and the active next hop for a test destination
- Trace an affected route's origin and external LSAs across the redistribution points
- Probe permitted DNS and denied server flows while reviewing imported VRF routes
- Inspect both VRF tables and prove a denied guest-management session is blocked
Explanation
Correct Answer
A:The preferred route must actually be installed. Local BGP attributes can steer the campus's own egress preference.
Incorrect Answers
B:Tags and advertising routers identify the feedback path. It would not resolve the documented symptom; the preferred route must actually be installed.
C:Both results confirm correct import scope. By contrast, the preferred route must actually be installed.
D:Routing isolation must be tested on actual source and destination pairs. In this situation, the preferred route must actually be installed.
Question 526
A campus has two eBGP providers and wants one preferred for outbound internet traffic. Which assumption would be most misleading when investigating this situation?
- Assume an OSPF Full neighbor state proves every attached VLAN prefix is advertised
- Assume AS-path prepending on advertisements solely controls the campus's own outbound path
- Change the access VLAN tag repeatedly even though the branch forward path is confirmed
- Assume changing OSPF cost will override a more specific static prefix automatically
Explanation
Correct Answer
B:Prepending generally influences other networks' inbound decisions. Local BGP attributes can steer the campus's own egress preference.
Incorrect Answers
A:OSPF can form adjacency while specific networks are filtered or excluded. By contrast, prepending generally influences other networks' inbound decisions.
C:VLAN changes do not create a missing upstream route. It would not resolve the documented symptom; prepending generally influences other networks' inbound decisions.
D:Prefix length is evaluated before comparing routes to a different prefix. The relevant technical distinction is that prepending generally influences other networks' inbound decisions.
Question 527
A campus has two eBGP providers and wants one preferred for outbound internet traffic. Which safeguard best reduces the deployment risk in this case?
- Review the permitted subnet inventory before broadening OSPF redistribution
- Validate approved prefixes and loop-prevention behavior before enabling new boundaries
- Test failure of the preferred carrier and verify the alternate route takes over
- Block unauthorized RAs on access ports while preserving the approved router
Explanation
Correct Answer
C:A preference policy should not eliminate internet resilience. The preferred route must actually be installed.
Incorrect Answers
A:Route leakage can expose management or guest networks. Here, however, a preference policy should not eliminate internet resilience.
B:A small filter error can affect multiple sites. By contrast, a preference policy should not eliminate internet resilience.
D:Dual-stack networks need control of rogue IPv6 gateways. The relevant technical distinction is that a preference policy should not eliminate internet resilience.
Question 528
An organization wants external networks to prefer one inbound campus internet circuit. What is the most appropriate first technical change?
- Design an appropriate area hierarchy and summarize where supported
- Coordinate a supported BGP advertisement strategy such as controlled AS-path prepending
- Use an approved tracked-route or dynamic failover design based on real reachability
- Apply a reviewed inbound prefix list or route-map filter for that neighbor
Explanation
Correct Answer
B:Export attributes can influence external routing decisions subject to peer policy. Local configuration does not guarantee how third-party ASes choose routes.
Incorrect Answers
A:Area planning can reduce excessive topology information and control scope. Here, however, export attributes can influence external routing decisions subject to peer policy.
C:Interface carrier is not proof that a remote service path works. In this situation, export attributes can influence external routing decisions subject to peer policy.
D:Import policy prevents unwanted external reachability information. The relevant technical distinction is that export attributes can influence external routing decisions subject to peer policy.
Question 529
An organization wants external networks to prefer one inbound campus internet circuit. Which observation would best verify that the intended behavior is working?
- Inspect advertised attributes and verify observed remote path preference
- Compare multiple traffic flows and next-hop byte counters during the same period
- Compare link-state database entries, route filters and installed prefixes
- Trace a test session in both directions and check the destination route table
Explanation
Correct Answer
A:Local configuration does not guarantee how third-party ASes choose routes. Export attributes can influence external routing decisions subject to peer policy.
Incorrect Answers
B:Flow-level evidence explains imbalance better than one speed test. In this situation, local configuration does not guarantee how third-party ASes choose routes.
C:The evidence distinguishes omitted advertisement from route preference. Here, however, local configuration does not guarantee how third-party ASes choose routes.
D:The missing return entry reveals why clients see timeouts. It would not resolve the documented symptom; local configuration does not guarantee how third-party ASes choose routes.
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.
HPE Network Campus Access Professional (HPE7-A01) Practice Tests
