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Question 480
A campus uses redundant OSPF paths but traffic takes a slower WAN despite a better fiber circuit. What is the most appropriate first technical change?
- Set appropriate interface costs based on documented path preference
- Advertise a conditional or monitored default route using a supported mechanism
- Verify both transit VLAN reachability and consistent OSPF interface settings
- Align the supported interface MTU and review OSPF database exchange diagnostics
Explanation
Correct Answer
A:OSPF best-path selection responds to cumulative metric rather than raw physical label. The route table verifies that the intended path wins.
Incorrect Answers
B:The default should not persist when the upstream exit is unavailable. By contrast, oSPF best-path selection responds to cumulative metric rather than raw physical label.
C:Protocol adjacency requires both Layer 2 transport and compatible routing configuration. It would not resolve the documented symptom; oSPF best-path selection responds to cumulative metric rather than raw physical label.
D:Incompatible MTUs can interrupt database synchronization on some platforms. In this situation, oSPF best-path selection responds to cumulative metric rather than raw physical label.
Question 481
A campus uses redundant OSPF paths but traffic takes a slower WAN despite a better fiber circuit. Which observation would best verify that the intended behavior is working?
- Trace a test session in both directions and check the destination route table
- Compare OSPF path costs and the installed next hop for a representative prefix
- Inspect both VRF tables and prove a denied guest-management session is blocked
- Capture RA contents and inspect client default-router entries
Explanation
Correct Answer
B:The route table verifies that the intended path wins. OSPF best-path selection responds to cumulative metric rather than raw physical label.
Incorrect Answers
A:The missing return entry reveals why clients see timeouts. It would not resolve the documented symptom; the route table verifies that the intended path wins.
C:Routing isolation must be tested on actual source and destination pairs. By contrast, the route table verifies that the intended path wins.
D:The actual messages reveal whether route discovery is succeeding. The relevant technical distinction is that the route table verifies that the intended path wins.
Question 482
A campus uses redundant OSPF paths but traffic takes a slower WAN despite a better fiber circuit. Which belief about the configuration should the team reject?
- Tune local preference before confirming the BGP TCP session can open
- Redistribute every connected VLAN into eBGP to avoid missing a subnet
- Assume every received BGP prefix becomes an active next hop immediately
- Change LACP hashing and assume OSPF cost automatically follows new bandwidth
Explanation
Correct Answer
D:Bundle settings do not necessarily update the intended routing metric. OSPF best-path selection responds to cumulative metric rather than raw physical label.
Incorrect Answers
A:Route attributes matter only after the session exchanges routes. Here, however, bundle settings do not necessarily update the intended routing metric.
B:This can disclose private guest and management networks. By contrast, bundle settings do not necessarily update the intended routing metric.
C:Route policy and eligibility can leave alternatives uninstalled. The relevant technical distinction is that bundle settings do not necessarily update the intended routing metric.
Question 483
A campus uses redundant OSPF paths but traffic takes a slower WAN despite a better fiber circuit. What should be included in the rollout plan to limit a foreseeable failure?
- Test backup route selection when the preferred fiber path is removed
- Capacity-plan for hash skew and a full single-link failure
- Block unauthorized RAs on access ports while preserving the approved router
- Document which source is authoritative before changing distance globally
Explanation
Correct Answer
A:Cost tuning must preserve resilience. The route table verifies that the intended path wins.
Incorrect Answers
B:Effective redundancy requires enough surviving bandwidth. In this situation, cost tuning must preserve resilience.
C:Dual-stack networks need control of rogue IPv6 gateways. The relevant technical distinction is that cost tuning must preserve resilience.
D:A blanket change can redirect many unrelated prefixes. Here, however, cost tuning must preserve resilience.
Question 484
A router receives two equal-length prefixes from different routing protocols and the wrong protocol wins. What should the network engineer do to address this requirement?
- Remove or adjust the stale more-specific route after verifying the migration plan
- Review administrative distance and route preference while preserving required policy
- Check next-hop resolution, best-path flags and competing route distance
- Align the supported interface MTU and review OSPF database exchange diagnostics
Explanation
Correct Answer
B:Different routing sources can compete for the same destination prefix. The selected entry shows which preference rule applied.
Incorrect Answers
A:Longest-prefix match can keep sending traffic to the old router. It would not resolve the documented symptom; different routing sources can compete for the same destination prefix.
C:Received control-plane information may not become the installed route. In this situation, different routing sources can compete for the same destination prefix.
D:Incompatible MTUs can interrupt database synchronization on some platforms. Here, however, different routing sources can compete for the same destination prefix.
Question 485
A router receives two equal-length prefixes from different routing protocols and the wrong protocol wins. What should the team inspect to confirm the result?
- Trace a test session in both directions and check the destination route table
- 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
- Inspect active and candidate routes with their distance and metric
Explanation
Correct Answer
D:The selected entry shows which preference rule applied. Different routing sources can compete for the same destination prefix.
Incorrect Answers
A:The missing return entry reveals why clients see timeouts. By contrast, the selected entry shows which preference rule applied.
B:Flow-level evidence explains imbalance better than one speed test. In this situation, the selected entry shows which preference rule applied.
C:A controlled fault demonstrates correct preference change. It would not resolve the documented symptom; the selected entry shows which preference rule applied.
Question 486
A router receives two equal-length prefixes from different routing protocols and the wrong protocol wins. Which misconception is most likely to obstruct a correct fix?
- Assume OSPF always wins over every static route regardless of configured distance
- Set local preference internally and assume it is advertised to every outside provider
- Redistribute every connected VLAN into eBGP to avoid missing a subnet
- Assume AS-path prepending on advertisements solely controls the campus's own outbound path
Explanation
Correct Answer
A:Lower-distance static routes may remain preferred. Different routing sources can compete for the same destination prefix.
Incorrect Answers
B:Local preference is not a universal eBGP inbound steering mechanism. By contrast, lower-distance static routes may remain preferred.
C:This can disclose private guest and management networks. It would not resolve the documented symptom; lower-distance static routes may remain preferred.
D:Prepending generally influences other networks' inbound decisions. The relevant technical distinction is that lower-distance static routes may remain preferred.
Question 487
A router receives two equal-length prefixes from different routing protocols and the wrong protocol wins. What precaution is most important before the change is expanded?
- Test failure of the preferred carrier and verify the alternate route takes over
- Specify probe targets and alerting that represent actual business egress
- Capacity-plan for hash skew and a full single-link failure
- Document which source is authoritative before changing distance globally
Explanation
Correct Answer
D:A blanket change can redirect many unrelated prefixes. The selected entry shows which preference rule applied.
Incorrect Answers
A:A preference policy should not eliminate internet resilience. By contrast, a blanket change can redirect many unrelated prefixes.
B:Bad probes can falsely mark a healthy default unavailable. The relevant technical distinction is that a blanket change can redirect many unrelated prefixes.
C:Effective redundancy requires enough surviving bandwidth. Here, however, a blanket change can redirect many unrelated prefixes.
Question 488
A branch uses a more specific static route through an old tunnel after the site migrates to new dynamic routing. Which configuration decision most directly resolves the situation?
- Enable appropriate inter-VLAN routing and permit only the intended Layer 3 access
- Ensure each loopback has valid underlay reachability and the intended source address
- Review administrative distance and route preference while preserving required policy
- Remove or update the stale narrow route so the intended route can win
Explanation
Correct Answer
D:Longest-prefix match can override a broader learned route. A narrow static path can win despite higher-level protocol preferences.
Incorrect Answers
A:Different subnets need a routed path and authorized policy for communication. In this situation, longest-prefix match can override a broader learned route.
B:Stable BGP endpoint identity still depends on forwarding routes. The relevant technical distinction is that longest-prefix match can override a broader learned route.
C:Different routing sources can compete for the same destination prefix. Here, however, longest-prefix match can override a broader learned route.
Question 489
A branch uses a more specific static route through an old tunnel after the site migrates to new dynamic routing. Which check most directly demonstrates the desired network behavior?
- Inspect the exact destination lookup and the installed prefixes after correction
- Inspect advertised attributes and verify observed remote path preference
- Capture hello traffic and inspect interface VLAN tagging and OSPF logs
- Compare multiple traffic flows and next-hop byte counters during the same period
Explanation
Correct Answer
A:A narrow static path can win despite higher-level protocol preferences. Longest-prefix match can override a broader learned route.
Incorrect Answers
B:Local configuration does not guarantee how third-party ASes choose routes. It would not resolve the documented symptom; a narrow static path can win despite higher-level protocol preferences.
C:The evidence separates missing frames from protocol mismatch. In this situation, a narrow static path can win despite higher-level protocol preferences.
D:Flow-level evidence explains imbalance better than one speed test. Here, however, a narrow static path can win despite higher-level protocol preferences.
Question 490
A branch uses a more specific static route through an old tunnel after the site migrates to new dynamic routing. Which assumption would be most misleading when investigating this situation?
- Assume changing OSPF cost will override a more specific static prefix automatically
- Set local preference internally and assume it is advertised to every outside provider
- Increase administrative distance to force a router to enter Full state
- Change BGP local preference to repair OSPF database-description rejection
Explanation
Correct Answer
A:Prefix length is evaluated before comparing routes to a different prefix. Longest-prefix match can override a broader learned route.
Incorrect Answers
B:Local preference is not a universal eBGP inbound steering mechanism. It would not resolve the documented symptom; prefix length is evaluated before comparing routes to a different prefix.
C:Route preference cannot repair neighbor negotiation. In this situation, prefix length is evaluated before comparing routes to a different prefix.
D:BGP attributes are unrelated to OSPF MTU negotiation. By contrast, prefix length is evaluated before comparing routes to a different prefix.
HPE Network Campus Access Professional (HPE7-A01) Practice Tests