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HP HPE7-A01 Practice Test 57

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?

  1. Use an appropriate internal BGP path-preference policy and inspect best-path selection
  2. Inspect reciprocal static/dynamic routes and correct the forwarding cycle
  3. Check next-hop resolution, best-path flags and competing route distance
  4. 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.

Question 561

A network engineer sees a route in the BGP table but not in the forwarding table. Which check most directly demonstrates the desired network behavior?

  1. Inspect recursive next hop and the selected kernel forwarding entry
  2. Compare multiple traffic flows and next-hop byte counters during the same period
  3. Probe permitted DNS and denied server flows while reviewing imported VRF routes
  4. Check source address, loopback reachability and established peer state

Explanation

Correct Answer

A:

The lookup reveals why one candidate cannot be used. Received control-plane information may not become the installed route.

Incorrect Answers

B:

Flow-level evidence explains imbalance better than one speed test. By contrast, the lookup reveals why one candidate cannot be used.

C:

Both results confirm correct import scope. The relevant technical distinction is that the lookup reveals why one candidate cannot be used.

D:

A functioning TCP route proves the peering's transport dependency. It would not resolve the documented symptom; the lookup reveals why one candidate cannot be used.

Question 562

A network engineer sees a route in the BGP table but not in the forwarding table. Which assumption would be most misleading when investigating this situation?

  1. Change LACP hashing and assume OSPF cost automatically follows new bandwidth
  2. Change the access VLAN tag repeatedly even though the branch forward path is confirmed
  3. Assume adding more areas automatically reduces traffic without configuring inter-area connectivity
  4. Assume every received BGP prefix becomes an active next hop immediately

Explanation

Correct Answer

D:

Route policy and eligibility can leave alternatives uninstalled. Received control-plane information may not become the installed route.

Incorrect Answers

A:

Bundle settings do not necessarily update the intended routing metric. Here, however, route policy and eligibility can leave alternatives uninstalled.

B:

VLAN changes do not create a missing upstream route. The relevant technical distinction is that route policy and eligibility can leave alternatives uninstalled.

C:

Areas need correct backbone relationships and route advertisement. By contrast, route policy and eligibility can leave alternatives uninstalled.

Question 563

A network engineer sees a route in the BGP table but not in the forwarding table. Which safeguard best reduces the deployment risk in this case?

  1. Capacity-plan for hash skew and a full single-link failure
  2. Test the secondary underlay and document recursive routing dependencies
  3. Validate the intended backup after primary route withdrawal
  4. Verify loss tolerance before enabling aggressive detection on production links

Explanation

Correct Answer

C:

A stored alternative should become usable under the expected failure. The lookup reveals why one candidate cannot be used.

Incorrect Answers

A:

Effective redundancy requires enough surviving bandwidth. Here, however, a stored alternative should become usable under the expected failure.

B:

A failover route should preserve loopback connectivity. In this situation, a stored alternative should become usable under the expected failure.

D:

BFD settings must not convert transient jitter into route outages. The relevant technical distinction is that a stored alternative should become usable under the expected failure.

Question 564

An OSPF peer remains down after switches are connected over a tagged routed transit VLAN. What is the most appropriate first technical change?

  1. Verify both transit VLAN reachability and consistent OSPF interface settings
  2. Design an appropriate area hierarchy and summarize where supported
  3. Evaluate supported BFD with compatible peer intervals and a controlled change plan
  4. Ensure each loopback has valid underlay reachability and the intended source address

Explanation

Correct Answer

A:

Protocol adjacency requires both Layer 2 transport and compatible routing configuration. The evidence separates missing frames from protocol mismatch.

Incorrect Answers

B:

Area planning can reduce excessive topology information and control scope. In this situation, protocol adjacency requires both Layer 2 transport and compatible routing configuration.

C:

Faster failure notification can reduce convergence latency. It would not resolve the documented symptom; protocol adjacency requires both Layer 2 transport and compatible routing configuration.

D:

Stable BGP endpoint identity still depends on forwarding routes. Here, however, protocol adjacency requires both Layer 2 transport and compatible routing configuration.

Question 565

An OSPF peer remains down after switches are connected over a tagged routed transit VLAN. Which observation would best verify that the intended behavior is working?

  1. Trace source gateway, route lookup and a permitted destination test
  2. Capture hello traffic and inspect interface VLAN tagging and OSPF logs
  3. Probe permitted DNS and denied server flows while reviewing imported VRF routes
  4. Trace a test session in both directions and check the destination route table

Explanation

Correct Answer

B:

The evidence separates missing frames from protocol mismatch. Protocol adjacency requires both Layer 2 transport and compatible routing configuration.

Incorrect Answers

A:

Working local VLAN membership alone does not establish inter-subnet forwarding. By contrast, the evidence separates missing frames from protocol mismatch.

C:

Both results confirm correct import scope. It would not resolve the documented symptom; the evidence separates missing frames from protocol mismatch.

D:

The missing return entry reveals why clients see timeouts. In this situation, the evidence separates missing frames from protocol mismatch.

Question 566

An OSPF peer remains down after switches are connected over a tagged routed transit VLAN. Which belief about the configuration should the team reject?

  1. Assume the staff firewall policy alone prevents every routing mistake after default import
  2. Set local preference internally and assume it is advertised to every outside provider
  3. Assume AS-path prepending on advertisements solely controls the campus's own outbound path
  4. Assume a healthy physical uplink means hello packets cross the correct VLAN

Explanation

Correct Answer

D:

Mis-tagging can isolate the routed interfaces. Protocol adjacency requires both Layer 2 transport and compatible routing configuration.

Incorrect Answers

A:

A wrong route can still disrupt or misroute permitted traffic. The relevant technical distinction is that mis-tagging can isolate the routed interfaces.

B:

Local preference is not a universal eBGP inbound steering mechanism. It would not resolve the documented symptom; mis-tagging can isolate the routed interfaces.

C:

Prepending generally influences other networks' inbound decisions. By contrast, mis-tagging can isolate the routed interfaces.

Question 567

An OSPF peer remains down after switches are connected over a tagged routed transit VLAN. What should be included in the rollout plan to limit a foreseeable failure?

  1. Document resolver dependencies and request owner review of future shared routes
  2. Require an address-owner sign-off before changing exported prefixes
  3. Maintain a reviewed route-leak matrix and regression tests
  4. Test adjacency before adding user subnet advertisements

Explanation

Correct Answer

D:

A small transit failure should not cascade into a campus outage. The evidence separates missing frames from protocol mismatch.

Incorrect Answers

A:

A minimal import list is easier to audit. By contrast, a small transit failure should not cascade into a campus outage.

B:

New routes should not expand external reachability without approval. The relevant technical distinction is that a small transit failure should not cascade into a campus outage.

C:

Shared changes should not contaminate isolated routing tables. Here, however, a small transit failure should not cascade into a campus outage.

Question 568

A data-center access VRF uses route leaking to reach a shared DNS resolver, but clients can reach unrelated server subnets. What should the network engineer do to address this requirement?

  1. Remove or update the stale narrow route so the intended route can win
  2. Add the authorized return route or dynamic routing advertisement on the distribution layer
  3. Enable appropriate inter-VLAN routing and permit only the intended Layer 3 access
  4. Restrict import policy to only required resolver prefixes and enforce security policy

Explanation

Correct Answer

D:

Shared services need narrow reachability rather than broadly merged tables. Both results confirm correct import scope.

Incorrect Answers

A:

Longest-prefix match can override a broader learned route. The relevant technical distinction is that shared services need narrow reachability rather than broadly merged tables.

B:

Successful forward traffic still requires a usable return path. Here, however, shared services need narrow reachability rather than broadly merged tables.

C:

Different subnets need a routed path and authorized policy for communication. In this situation, shared services need narrow reachability rather than broadly merged tables.

Question 569

A data-center access VRF uses route leaking to reach a shared DNS resolver, but clients can reach unrelated server subnets. What should the team inspect to confirm the result?

  1. Inspect advertised attributes and verify observed remote path preference
  2. Capture hello traffic and inspect interface VLAN tagging and OSPF logs
  3. Probe permitted DNS and denied server flows while reviewing imported VRF routes
  4. Inspect neighbor state, network type and hello parameters on both switches

Explanation

Correct Answer

C:

Both results confirm correct import scope. Shared services need narrow reachability rather than broadly merged tables.

Incorrect Answers

A:

Local configuration does not guarantee how third-party ASes choose routes. It would not resolve the documented symptom; both results confirm correct import scope.

B:

The evidence separates missing frames from protocol mismatch. Here, however, both results confirm correct import scope.

D:

Peer-level evidence reveals incompatible adjacency expectations. In this situation, both results confirm correct import scope.

Question 570

A data-center access VRF uses route leaking to reach a shared DNS resolver, but clients can reach unrelated server subnets. Which misconception is most likely to obstruct a correct fix?

  1. Set an unconditional default advertisement and assume the internet never fails
  2. Assume one large TCP flow must be split evenly across every ECMP next hop
  3. Import the entire server VRF into every client VRF to simplify name resolution
  4. Adjust the new core's interface bandwidth and assume the shorter prefix becomes preferred

Explanation

Correct Answer

C:

Overbroad route leaking expands lateral reachability. Shared services need narrow reachability rather than broadly merged tables.

Incorrect Answers

A:

Peers may blackhole all outbound traffic through a dead gateway. In this situation, overbroad route leaking expands lateral reachability.

B:

Ordinary per-flow balancing can keep that connection on a single path. By contrast, overbroad route leaking expands lateral reachability.

D:

Link speed does not override destination specificity. It would not resolve the documented symptom; overbroad route leaking expands lateral reachability.

HPE Network Campus Access Professional (HPE7-A01) Practice Tests

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