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HP HPE7-A08 Practice Test 52

Question 510

Operators need to know whether ISL, keepalive or config sync failed after an alarm. What command output class is most decisive?

  1. Simultaneous ISL and keepalive failure
  2. VSX LAG sync mismatch
  3. VSX peer status inspection
  4. VSX peer software mismatch

Explanation

Correct Answer

C:

VSX operational status distinguishes peer health dimensions. VSX status outputs identify ISL, peer roles, keepalive and sync operational state.

Incorrect Answers

A:

Loss of both paths risks split-brain behavior and invokes supported split-recovery controls. But this does not address the case requirement to inspect exact peer and link state.

B:

Inconsistent selected LAG or VLAN attributes can keep a multi-chassis LAG from becoming healthy. But this does not address the case requirement to inspect exact peer and link state.

D:

Incompatible peer software can affect formation or synchronized capabilities. But this does not address the case requirement to inspect exact peer and link state.

Question 511

The entire VSX peer transport is cut and both nodes believe they are alone. Which fault class is occurring?

  1. VSX peer status inspection
  2. VSX LAG sync mismatch
  3. Keepalive path failure
  4. Simultaneous ISL and keepalive failure

Explanation

Correct Answer

D:

Combined ISL and keepalive failure undermines peer discrimination. Loss of both paths risks split-brain behavior and invokes supported split-recovery controls.

Incorrect Answers

A:

VSX status outputs identify ISL, peer roles, keepalive and sync operational state. But this does not address the case requirement to diagnose split-brain conditions.

B:

Inconsistent selected LAG or VLAN attributes can keep a multi-chassis LAG from becoming healthy. But this does not address the case requirement to diagnose split-brain conditions.

C:

Loss of keepalive alone removes one heartbeat path while normal ISL sync may remain healthy. But this does not address the case requirement to diagnose split-brain conditions.

Question 512

Keepalive pings succeed but VSX LAGs suspend after an ISL outage. What underlying transport failed?

  1. VSX peer status inspection
  2. Keepalive path failure
  3. Simultaneous ISL and keepalive failure
  4. ISL failure with keepalive present

Explanation

Correct Answer

D:

Keepalive is not a replacement for the main ISL. The VSX inter-switch link is lost but independent keepalive can still report peer liveness.

Incorrect Answers

A:

VSX status outputs identify ISL, peer roles, keepalive and sync operational state. But this does not address the case requirement to identify loss of the peer synchronization link.

B:

Loss of keepalive alone removes one heartbeat path while normal ISL sync may remain healthy. But this does not address the case requirement to identify loss of the peer synchronization link.

C:

Loss of both paths risks split-brain behavior and invokes supported split-recovery controls. But this does not address the case requirement to identify loss of the peer synchronization link.

Question 513

One VSX peer has different VLAN membership on a shared multi-chassis aggregate. What should be suspected?

  1. Simultaneous ISL and keepalive failure
  2. ISL failure with keepalive present
  3. VSX peer software mismatch
  4. VSX LAG sync mismatch

Explanation

Correct Answer

D:

Cross-peer member inconsistency can affect VSX LAG health. Inconsistent selected LAG or VLAN attributes can keep a multi-chassis LAG from becoming healthy.

Incorrect Answers

A:

Loss of both paths risks split-brain behavior and invokes supported split-recovery controls. But this does not address the case requirement to find mismatched distributed bundle configuration.

B:

The VSX inter-switch link is lost but independent keepalive can still report peer liveness. But this does not address the case requirement to find mismatched distributed bundle configuration.

C:

Incompatible peer software can affect formation or synchronized capabilities. But this does not address the case requirement to find mismatched distributed bundle configuration.

Question 514

Two CX routers have interface link but OSPF area 0 versus area 10 on the same connection. What defect explains missing adjacency?

  1. OSPF passive-interface mistake
  2. OSPF area mismatch
  3. OSPF interface MTU mismatch
  4. OSPF authentication mismatch

Explanation

Correct Answer

B:

Area mismatch prevents intended peer formation. Neighbors connected on one link may fail if area IDs are inconsistent.

Incorrect Answers

A:

An interface configured passive will not form the expected OSPF neighbor relationship. But this does not address the case requirement to identify conflicting routing areas.

C:

In some OSPF adjacency cases, mismatched MTU can stall database exchange or neighbor progress. But this does not address the case requirement to identify conflicting routing areas.

D:

Different authentication settings can prevent accepted OSPF hellos. But this does not address the case requirement to identify conflicting routing areas.

Question 515

OSPF hellos arrive but one side rejects all peers after an authentication secret change. What failure is likely?

  1. OSPF failure-driven reconvergence
  2. OSPF passive-interface mistake
  3. OSPF authentication mismatch
  4. OSPF area mismatch

Explanation

Correct Answer

C:

OSPF authentication parameters do not match. Different authentication settings can prevent accepted OSPF hellos.

Incorrect Answers

A:

An adjacency loss removes the learned path until alternate routing converges. But this does not address the case requirement to identify an OSPF key mismatch.

B:

An interface configured passive will not form the expected OSPF neighbor relationship. But this does not address the case requirement to identify an OSPF key mismatch.

D:

Neighbors connected on one link may fail if area IDs are inconsistent. But this does not address the case requirement to identify an OSPF key mismatch.

Question 516

Two OSPF routers remain in EXSTART/EXCHANGE after a tunnel MTU change. What parameter should be investigated?

  1. OSPF failure-driven reconvergence
  2. OSPF authentication mismatch
  3. OSPF interface MTU mismatch
  4. OSPF passive-interface mistake

Explanation

Correct Answer

C:

MTU disagreement can impede database exchange. In some OSPF adjacency cases, mismatched MTU can stall database exchange or neighbor progress.

Incorrect Answers

A:

An adjacency loss removes the learned path until alternate routing converges. But this does not address the case requirement to identify an MTU-related adjacency stall.

B:

Different authentication settings can prevent accepted OSPF hellos. But this does not address the case requirement to identify an MTU-related adjacency stall.

D:

An interface configured passive will not form the expected OSPF neighbor relationship. But this does not address the case requirement to identify an MTU-related adjacency stall.

Question 517

An engineer enabled OSPF on an uplink but accidentally marked the port passive. What explains no neighboring router?

  1. OSPF failure-driven reconvergence
  2. OSPF authentication mismatch
  3. OSPF passive-interface mistake
  4. OSPF interface MTU mismatch

Explanation

Correct Answer

C:

Passive OSPF suppresses neighbor discovery on that interface. An interface configured passive will not form the expected OSPF neighbor relationship.

Incorrect Answers

A:

An adjacency loss removes the learned path until alternate routing converges. But this does not address the case requirement to identify a passive-interface error.

B:

Different authentication settings can prevent accepted OSPF hellos. But this does not address the case requirement to identify a passive-interface error.

D:

In some OSPF adjacency cases, mismatched MTU can stall database exchange or neighbor progress. But this does not address the case requirement to identify a passive-interface error.

Question 518

Adjacencies are FULL but an expected server subnet never appears as an OSPF route. Which advertisement issue is possible?

  1. OSPF interface MTU mismatch
  2. OSPF area mismatch
  3. Missing route advertisement
  4. OSPF authentication mismatch

Explanation

Correct Answer

C:

The prefix may be omitted from routing distribution. A connected prefix may not be included in intended OSPF advertisement or permitted export policy.

Incorrect Answers

A:

In some OSPF adjacency cases, mismatched MTU can stall database exchange or neighbor progress. But this does not address the case requirement to distinguish missing advertisement from link failure.

B:

Neighbors connected on one link may fail if area IDs are inconsistent. But this does not address the case requirement to distinguish missing advertisement from link failure.

D:

Different authentication settings can prevent accepted OSPF hellos. But this does not address the case requirement to distinguish missing advertisement from link failure.

Question 519

A core OSPF peer crashes, and remote prefixes temporarily disappear before an alternate path forms. What is happening?

  1. OSPF interface MTU mismatch
  2. OSPF passive-interface mistake
  3. OSPF failure-driven reconvergence
  4. OSPF authentication mismatch

Explanation

Correct Answer

C:

Routing reconverges after adjacency loss. An adjacency loss removes the learned path until alternate routing converges.

Incorrect Answers

A:

In some OSPF adjacency cases, mismatched MTU can stall database exchange or neighbor progress. But this does not address the case requirement to identify OSPF neighbor-failure behavior.

B:

An interface configured passive will not form the expected OSPF neighbor relationship. But this does not address the case requirement to identify OSPF neighbor-failure behavior.

D:

Different authentication settings can prevent accepted OSPF hellos. But this does not address the case requirement to identify OSPF neighbor-failure behavior.

Question 520

A router never advances beyond database exchange after a mismatched jumbo-frame setting. Which OSPF dependency deserves testing?

  1. OSPF authentication mismatch
  2. OSPF passive-interface mistake
  3. OSPF interface MTU mismatch
  4. OSPF failure-driven reconvergence

Explanation

Correct Answer

C:

Differing MTUs can be relevant to OSPF adjacency exchange. In some OSPF adjacency cases, mismatched MTU can stall database exchange or neighbor progress.

Incorrect Answers

A:

Different authentication settings can prevent accepted OSPF hellos. But this does not address the case requirement to check L3 interface MTU settings.

B:

An interface configured passive will not form the expected OSPF neighbor relationship. But this does not address the case requirement to check L3 interface MTU settings.

D:

An adjacency loss removes the learned path until alternate routing converges. But this does not address the case requirement to check L3 interface MTU settings.

HPE Network Switching Professional (HPE7-A08) Practice Tests

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