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HP HPE7-A08 Practice Test 31

Question 300

Two OSPF peers have mismatched hello/dead timers and never reach full state. What setting deserves review?

  1. Layer 3 reachability and subnet agreement
  2. Matching authentication settings
  3. Area ID agreement
  4. Compatible hello and dead intervals

Explanation

Correct Answer

D:

Hello and dead intervals are neighbor compatibility parameters. Neighbor hello/dead timing must be compatible for normal OSPF adjacency.

Incorrect Answers

A:

OSPF peers on a common broadcast network need compatible IP addressing and link state. But this does not address the case requirement to make OSPF timing consistent across a link.

B:

OSPF peers must have compatible authentication and credentials when authentication is enabled. But this does not address the case requirement to make OSPF timing consistent across a link.

C:

OSPF neighbors on the same link must agree on the area assignment. But this does not address the case requirement to make OSPF timing consistent across a link.

Question 301

A routed interface is up but its peer IP is in a different subnet and no routing exists between them. What prerequisite is missing?

  1. Network type consistency
  2. Layer 3 reachability and subnet agreement
  3. OSPF neighbor state inspection
  4. Compatible hello and dead intervals

Explanation

Correct Answer

B:

Layer 3 reachability and compatible link addressing are needed. OSPF peers on a common broadcast network need compatible IP addressing and link state.

Incorrect Answers

A:

OSPF interface network type affects neighbor election and adjacency behavior. But this does not address the case requirement to allow neighbors to exchange protocol packets.

C:

Neighbor-state output reveals progression from discovery to adjacency and possible stalls. But this does not address the case requirement to allow neighbors to exchange protocol packets.

D:

Neighbor hello/dead timing must be compatible for normal OSPF adjacency. But this does not address the case requirement to allow neighbors to exchange protocol packets.

Question 302

A link is treated point-to-point on one side and broadcast on the other, producing unexpected OSPF behavior. What should be compared?

  1. Layer 3 reachability and subnet agreement
  2. OSPF neighbor state inspection
  3. Area ID agreement
  4. Network type consistency

Explanation

Correct Answer

D:

OSPF network types influence adjacency and designated-router logic. OSPF interface network type affects neighbor election and adjacency behavior.

Incorrect Answers

A:

OSPF peers on a common broadcast network need compatible IP addressing and link state. But this does not address the case requirement to align interface OSPF network behavior.

B:

Neighbor-state output reveals progression from discovery to adjacency and possible stalls. But this does not address the case requirement to align interface OSPF network behavior.

C:

OSPF neighbors on the same link must agree on the area assignment. But this does not address the case requirement to align interface OSPF network behavior.

Question 303

The CLI shows INIT or EXSTART rather than FULL for a routing peer. Which operational evidence should be collected?

  1. OSPF neighbor state inspection
  2. Network type consistency
  3. Matching authentication settings
  4. Compatible hello and dead intervals

Explanation

Correct Answer

A:

OSPF neighbor states reveal where formation stalls. Neighbor-state output reveals progression from discovery to adjacency and possible stalls.

Incorrect Answers

B:

OSPF interface network type affects neighbor election and adjacency behavior. But this does not address the case requirement to inspect active neighbor progression.

C:

OSPF peers must have compatible authentication and credentials when authentication is enabled. But this does not address the case requirement to inspect active neighbor progression.

D:

Neighbor hello/dead timing must be compatible for normal OSPF adjacency. But this does not address the case requirement to inspect active neighbor progression.

Question 304

Two routers exchange OSPF hellos but each interface belongs to a different area. What must be corrected first?

  1. Layer 3 reachability and subnet agreement
  2. OSPF neighbor state inspection
  3. Matching authentication settings
  4. Area ID agreement

Explanation

Correct Answer

D:

Area mismatch prevents the intended same-link adjacency. OSPF neighbors on the same link must agree on the area assignment.

Incorrect Answers

A:

OSPF peers on a common broadcast network need compatible IP addressing and link state. But this does not address the case requirement to match configured area IDs.

B:

Neighbor-state output reveals progression from discovery to adjacency and possible stalls. But this does not address the case requirement to match configured area IDs.

C:

OSPF peers must have compatible authentication and credentials when authentication is enabled. But this does not address the case requirement to match configured area IDs.

Question 305

A temporary config applies different OSPF dead intervals to a newly connected core pair. Which settings should be rechecked?

  1. Matching authentication settings
  2. Layer 3 reachability and subnet agreement
  3. Area ID agreement
  4. Compatible hello and dead intervals

Explanation

Correct Answer

D:

Timer agreement helps peers maintain consistent adjacency. Neighbor hello/dead timing must be compatible for normal OSPF adjacency.

Incorrect Answers

A:

OSPF peers must have compatible authentication and credentials when authentication is enabled. But this does not address the case requirement to restore compatible OSPF keepalive parameters.

B:

OSPF peers on a common broadcast network need compatible IP addressing and link state. But this does not address the case requirement to restore compatible OSPF keepalive parameters.

C:

OSPF neighbors on the same link must agree on the area assignment. But this does not address the case requirement to restore compatible OSPF keepalive parameters.

Question 306

An authenticated OSPF neighbor went down immediately after credential change. What should be reviewed?

  1. Layer 3 reachability and subnet agreement
  2. Area ID agreement
  3. Compatible hello and dead intervals
  4. Matching authentication settings

Explanation

Correct Answer

D:

Mismatched authentication credentials prevent accepted hellos. OSPF peers must have compatible authentication and credentials when authentication is enabled.

Incorrect Answers

A:

OSPF peers on a common broadcast network need compatible IP addressing and link state. But this does not address the case requirement to synchronize routing authentication secrets.

B:

OSPF neighbors on the same link must agree on the area assignment. But this does not address the case requirement to synchronize routing authentication secrets.

C:

Neighbor hello/dead timing must be compatible for normal OSPF adjacency. But this does not address the case requirement to synchronize routing authentication secrets.

Question 307

Router A sees destination costs 15 and 28 through two working neighbors. What forwarding decision should OSPF make?

  1. ECMP for equal total costs
  2. Adjacency health and reachability
  3. OSPF passive interface planning
  4. OSPF lowest-cost path selection

Explanation

Correct Answer

D:

The lower total-cost route is preferred. OSPF prefers eligible paths with the lowest calculated total cost to a destination.

Incorrect Answers

A:

Multiple equal-cost paths can be installed if supported and enabled. But this does not address the case requirement to choose the least-cost eligible OSPF path.

B:

A lost adjacency removes learned routes until alternate topology converges. But this does not address the case requirement to choose the least-cost eligible OSPF path.

C:

Passive interfaces can advertise a connected subnet without forming neighbors through the endpoint-facing interface. But this does not address the case requirement to choose the least-cost eligible OSPF path.

Question 308

Two redundant uplinks have identical OSPF total cost and policy allows load sharing. Which behavior can occur?

  1. OSPF passive interface planning
  2. LSDB and route comparison
  3. ECMP for equal total costs
  4. Route summarization at correct boundary

Explanation

Correct Answer

C:

Equal-cost routes can appear as multiple next hops. Multiple equal-cost paths can be installed if supported and enabled.

Incorrect Answers

A:

Passive interfaces can advertise a connected subnet without forming neighbors through the endpoint-facing interface. But this does not address the case requirement to use eligible equal-cost paths.

B:

OSPF link-state database and installed route state should be compared to troubleshoot missing prefixes. But this does not address the case requirement to use eligible equal-cost paths.

D:

Supported summaries reduce unnecessary routes without hiding required distinct prefixes. But this does not address the case requirement to use eligible equal-cost paths.

Question 309

A desktop-facing VLAN should be advertised in OSPF but cannot have a neighbor on each PC port. What interface policy fits?

  1. OSPF passive interface planning
  2. Adjacency health and reachability
  3. ECMP for equal total costs
  4. Route summarization at correct boundary

Explanation

Correct Answer

A:

Making endpoint-facing OSPF passive prevents unwanted neighbor formation. Passive interfaces can advertise a connected subnet without forming neighbors through the endpoint-facing interface.

Incorrect Answers

B:

A lost adjacency removes learned routes until alternate topology converges. But this does not address the case requirement to advertise a user subnet without peering to endpoints.

C:

Multiple equal-cost paths can be installed if supported and enabled. But this does not address the case requirement to advertise a user subnet without peering to endpoints.

D:

Supported summaries reduce unnecessary routes without hiding required distinct prefixes. But this does not address the case requirement to advertise a user subnet without peering to endpoints.

Question 310

An area border router sends dozens of consecutive /24 routes to its upstream peer. Which route-design function can reduce scale?

  1. Adjacency health and reachability
  2. OSPF passive interface planning
  3. Route summarization at correct boundary
  4. OSPF lowest-cost path selection

Explanation

Correct Answer

C:

Supported route aggregation reduces exposed prefix count. Supported summaries reduce unnecessary routes without hiding required distinct prefixes.

Incorrect Answers

A:

A lost adjacency removes learned routes until alternate topology converges. But this does not address the case requirement to summarize contiguous routing information.

B:

Passive interfaces can advertise a connected subnet without forming neighbors through the endpoint-facing interface. But this does not address the case requirement to summarize contiguous routing information.

D:

OSPF prefers eligible paths with the lowest calculated total cost to a destination. But this does not address the case requirement to summarize contiguous routing information.

HPE Network Switching Professional (HPE7-A08) Practice Tests

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