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HP HPE7-A08 Practice Test 68

Question 670

A core receives tens of thousands of more specific routes than the design planned and route update load increases. What design omission contributes?

  1. Next-hop adjacency instability
  2. Frequent OSPF neighbor resets
  3. BGP policy-induced path change
  4. Missing routing summary

Explanation

Correct Answer

D:

The lack of appropriate route summarization increases state. Many individual prefixes may increase control-state scale and update overhead.

Incorrect Answers

A:

An ARP or L2 neighbor that repeatedly expires can cause transient packet loss despite steady route entries. But this does not address the case requirement to identify inefficient prefix aggregation.

B:

Neighbor flapping triggers route recalculation and transient forwarding interruptions. But this does not address the case requirement to identify inefficient prefix aggregation.

C:

Changed import/export preferences can select an unintended longer path for some destinations. But this does not address the case requirement to identify inefficient prefix aggregation.

Question 671

A new BGP policy sends a particular site through a distant provider, though interfaces are error-free. What explains added latency?

  1. Control-plane CPU exhaustion
  2. Next-hop adjacency instability
  3. Frequent OSPF neighbor resets
  4. BGP policy-induced path change

Explanation

Correct Answer

D:

Route-policy selection changed the chosen egress path. Changed import/export preferences can select an unintended longer path for some destinations.

Incorrect Answers

A:

Excessive protocol or exception traffic can delay routing convergence and administrative responsiveness. But this does not address the case requirement to identify BGP policy-induced detour.

B:

An ARP or L2 neighbor that repeatedly expires can cause transient packet loss despite steady route entries. But this does not address the case requirement to identify BGP policy-induced detour.

C:

Neighbor flapping triggers route recalculation and transient forwarding interruptions. But this does not address the case requirement to identify BGP policy-induced detour.

Question 672

The FIB retains a default route but intermittent ARP resolution failures cause packets to pause. Which dependency explains loss?

  1. Next-hop adjacency instability
  2. BGP policy-induced path change
  3. Frequent OSPF neighbor resets
  4. Unexpected OSPF metric or ECMP selection

Explanation

Correct Answer

A:

Unstable next-hop neighbor resolution interrupts forwarding. An ARP or L2 neighbor that repeatedly expires can cause transient packet loss despite steady route entries.

Incorrect Answers

B:

Changed import/export preferences can select an unintended longer path for some destinations. But this does not address the case requirement to identify ARP adjacency instability.

C:

Neighbor flapping triggers route recalculation and transient forwarding interruptions. But this does not address the case requirement to identify ARP adjacency instability.

D:

Changed path cost can redirect traffic over a slower or congested link. But this does not address the case requirement to identify ARP adjacency instability.

Question 673

Large transfer sessions pause at the same times an OSPF peering adjacency drops and reforms. Which mechanism correlates?

  1. Frequent OSPF neighbor resets
  2. Unexpected OSPF metric or ECMP selection
  3. Control-plane CPU exhaustion
  4. BGP policy-induced path change

Explanation

Correct Answer

A:

Neighbor resets cause temporary route withdrawal and recompute. Neighbor flapping triggers route recalculation and transient forwarding interruptions.

Incorrect Answers

B:

Changed path cost can redirect traffic over a slower or congested link. But this does not address the case requirement to identify convergence delays.

C:

Excessive protocol or exception traffic can delay routing convergence and administrative responsiveness. But this does not address the case requirement to identify convergence delays.

D:

Changed import/export preferences can select an unintended longer path for some destinations. But this does not address the case requirement to identify convergence delays.

Question 674

The active campus route uses a low-bandwidth link after an operator lowered its OSPF cost. Which setting likely caused the change?

  1. Frequent OSPF neighbor resets
  2. Missing routing summary
  3. Unexpected OSPF metric or ECMP selection
  4. Next-hop adjacency instability

Explanation

Correct Answer

C:

Routing metric inadvertently made the backup appear preferable. Changed path cost can redirect traffic over a slower or congested link.

Incorrect Answers

A:

Neighbor flapping triggers route recalculation and transient forwarding interruptions. But this does not address the case requirement to identify traffic diversion by OSPF cost.

B:

Many individual prefixes may increase control-state scale and update overhead. But this does not address the case requirement to identify traffic diversion by OSPF cost.

D:

An ARP or L2 neighbor that repeatedly expires can cause transient packet loss despite steady route entries. But this does not address the case requirement to identify traffic diversion by OSPF cost.

Question 675

Routing updates lag and SSH responds slowly while packet punts overwhelm a supervisor CPU. What root issue is likely?

  1. BGP policy-induced path change
  2. Control-plane CPU exhaustion
  3. Next-hop adjacency instability
  4. Missing routing summary

Explanation

Correct Answer

B:

Control-plane overload delays both routing and management tasks. Excessive protocol or exception traffic can delay routing convergence and administrative responsiveness.

Incorrect Answers

A:

Changed import/export preferences can select an unintended longer path for some destinations. But this does not address the case requirement to identify saturation of routing processor resources.

C:

An ARP or L2 neighbor that repeatedly expires can cause transient packet loss despite steady route entries. But this does not address the case requirement to identify saturation of routing processor resources.

D:

Many individual prefixes may increase control-state scale and update overhead. But this does not address the case requirement to identify saturation of routing processor resources.

Question 676

A switch has no remaining PoE budget and a new access point boots only intermittently. What best explains the service degradation?

  1. PoE negotiation class mismatch
  2. Endpoint application saturation
  3. Insufficient remaining PoE power budget
  4. Faulty endpoint network driver

Explanation

Correct Answer

C:

The device may not receive required power from the access switch. An overloaded switch PoE budget may deny or throttle the power a connected endpoint requires.

Incorrect Answers

A:

A power class or LLDP power mismatch may leave an endpoint underpowered despite link carrier. But this does not address the case requirement to identify PoE budget shortage.

B:

CPU, storage or application-thread exhaustion can cause slow responses even when network counters are healthy. But this does not address the case requirement to identify PoE budget shortage.

D:

A host NIC software defect can cause retransmissions or high interrupt load without upstream link errors. But this does not address the case requirement to identify PoE budget shortage.

Question 677

An IP phone requests high PoE class but receives a lower negotiated class and restarts under load. What is likely wrong?

  1. Faulty endpoint network driver
  2. Endpoint duplex or flow-control behavior
  3. PoE negotiation class mismatch
  4. Endpoint application saturation

Explanation

Correct Answer

C:

Power-class or LLDP negotiation does not satisfy device demand. A power class or LLDP power mismatch may leave an endpoint underpowered despite link carrier.

Incorrect Answers

A:

A host NIC software defect can cause retransmissions or high interrupt load without upstream link errors. But this does not address the case requirement to identify PoE classification mismatch.

B:

A host NIC configuration mismatch can cause bursts, pauses or loss on the last hop. But this does not address the case requirement to identify PoE classification mismatch.

D:

CPU, storage or application-thread exhaustion can cause slow responses even when network counters are healthy. But this does not address the case requirement to identify PoE classification mismatch.

Question 678

One laptop has poor throughput after an NIC driver update, while identical ports have clean counters for other users. Which cause fits?

  1. Endpoint application saturation
  2. Endpoint DNS resolver problem
  3. Faulty endpoint network driver
  4. Endpoint duplex or flow-control behavior

Explanation

Correct Answer

C:

A faulty endpoint driver can generate retransmissions independent of the campus link. A host NIC software defect can cause retransmissions or high interrupt load without upstream link errors.

Incorrect Answers

A:

CPU, storage or application-thread exhaustion can cause slow responses even when network counters are healthy. But this does not address the case requirement to identify client driver issue.

B:

Slow or failing name resolution can be mistaken for slow network paths despite IP connectivity. But this does not address the case requirement to identify client driver issue.

D:

A host NIC configuration mismatch can cause bursts, pauses or loss on the last hop. But this does not address the case requirement to identify client driver issue.

Question 679

A workstation experiences repeated pause frames and throughput collapse after forced interface settings on its NIC. What local setting may explain it?

  1. Faulty endpoint network driver
  2. Endpoint DNS resolver problem
  3. Endpoint duplex or flow-control behavior
  4. Endpoint application saturation

Explanation

Correct Answer

C:

Endpoint duplex or flow-control behavior is inconsistent with the link. A host NIC configuration mismatch can cause bursts, pauses or loss on the last hop.

Incorrect Answers

A:

A host NIC software defect can cause retransmissions or high interrupt load without upstream link errors. But this does not address the case requirement to identify host Ethernet configuration.

B:

Slow or failing name resolution can be mistaken for slow network paths despite IP connectivity. But this does not address the case requirement to identify host Ethernet configuration.

D:

CPU, storage or application-thread exhaustion can cause slow responses even when network counters are healthy. But this does not address the case requirement to identify host Ethernet configuration.

Question 680

An internal application responds slowly from one server even when packet captures show low network latency and no drops. What root cause should be investigated?

  1. Endpoint application saturation
  2. Endpoint duplex or flow-control behavior
  3. Endpoint DNS resolver problem
  4. Faulty endpoint network driver

Explanation

Correct Answer

A:

The service may be limited by application CPU or backend resources. CPU, storage or application-thread exhaustion can cause slow responses even when network counters are healthy.

Incorrect Answers

B:

A host NIC configuration mismatch can cause bursts, pauses or loss on the last hop. But this does not address the case requirement to identify endpoint application bottleneck.

C:

Slow or failing name resolution can be mistaken for slow network paths despite IP connectivity. But this does not address the case requirement to identify endpoint application bottleneck.

D:

A host NIC software defect can cause retransmissions or high interrupt load without upstream link errors. But this does not address the case requirement to identify endpoint application bottleneck.

HPE Network Switching Professional (HPE7-A08) Practice Tests

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