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Exam Code: JN0-650

Exam Name: Enterprise Routing and Switching, Professional (JNCIP-ENT)

Certification Provider: Juniper

Corresponding Certification: JNCIP-ENT

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Juniper JN0-650 Practice Test 52

Question 510

A Junos network engineer takes this step: Inspect VSTP root, path and port-role details before treating the blocking state as a physical fault. Which outcome most directly follows?

  1. The team can distinguish deliberate loop prevention from physical failure.
  2. Each VLAN can elect the specified preferred root and its own forwarding tree.
  3. The VLAN avoids persistent bridging loops while keeping a backup path available.
  4. The troubleshooting effort can isolate a per-VLAN topology or state discrepancy.

Explanation

Correct Answer

A:

This is the direct result of the VSTP blocked port decision: The team can distinguish deliberate loop prevention from physical failure.

Incorrect Answers

B:

This outcome is associated with VSTP per-VLAN roots (Configure VSTP bridge priorities per VLAN so the intended root differs by VLAN.), not the specified action.

C:

This outcome is associated with VSTP loop protection (Use supported VSTP to calculate forwarding and discarding roles for that VLAN.), not the specified action.

D:

This outcome is associated with VSTP convergence verification (Inspect that VLAN's VSTP port state and topology information on the relevant switches.), not the specified action.

Question 511

An operator believes a VSTP-discarding interface indicates a defective cable despite healthy link status. A colleague instead suggests: Inspect that VLAN's VSTP port state and topology information on the relevant switches. Which corrective approach most directly addresses the original issue?

  1. Configure VSTP bridge priorities per VLAN so the intended root differs by VLAN.
  2. Inspect VSTP root, path and port-role details before treating the blocking state as a physical fault.
  3. Inspect that VLAN's VSTP port state and topology information on the relevant switches.
  4. Use supported VSTP to calculate forwarding and discarding roles for that VLAN.

Explanation

Correct Answer

B:

This corrective choice addresses VSTP blocked port. The team can distinguish deliberate loop prevention from physical failure.

Incorrect Answers

A:

That alternative applies to VSTP per-VLAN roots instead. Each VLAN can elect the specified preferred root and its own forwarding tree.

C:

That alternative applies to VSTP convergence verification instead. The troubleshooting effort can isolate a per-VLAN topology or state discrepancy.

D:

That alternative applies to VSTP loop protection instead. The VLAN avoids persistent bridging loops while keeping a backup path available.

Question 512

An enterprise network designer recommends: Inspect VSTP root, path and port-role details before treating the blocking state as a physical fault. Which situation most clearly calls for this action?

  1. A redundant trunk is activated after a failure and only one VLAN remains unable to forward across the new path.
  2. Two VLANs on the same Junos switching domain need distinct preferred root bridges for traffic engineering.
  3. An operator believes a VSTP-discarding interface indicates a defective cable despite healthy link status.
  4. An access VLAN has two redundant uplinks forming a physical ring and requires a VLAN-specific loop-free topology.

Explanation

Correct Answer

C:

This case requires the VSTP blocked port action. The team can distinguish deliberate loop prevention from physical failure.

Incorrect Answers

A:

This other case would be better matched to Inspect that VLAN's VSTP port state and topology information on the relevant switches. The troubleshooting effort can isolate a per-VLAN topology or state discrepancy.

B:

This other case would be better matched to Configure VSTP bridge priorities per VLAN so the intended root differs by VLAN. Each VLAN can elect the specified preferred root and its own forwarding tree.

D:

This other case would be better matched to Use supported VSTP to calculate forwarding and discarding roles for that VLAN. The VLAN avoids persistent bridging loops while keeping a backup path available.

Question 513

A new switch with a lower VLAN-specific bridge priority unexpectedly becomes VSTP root on a production VLAN. Which Junos networking action or protocol decision best addresses this requirement?

  1. Restore the planned VSTP bridge priority and root placement for that VLAN.
  2. Use supported VSTP to calculate forwarding and discarding roles for that VLAN.
  3. Configure VSTP bridge priorities per VLAN so the intended root differs by VLAN.
  4. Verify that the VLAN is included in the appropriate VSTP configuration on all relevant trunk links.

Explanation

Correct Answer

A:

This action addresses VSTP root drift. The desired distribution switch can regain control of the VLAN's spanning-tree topology.

Incorrect Answers

B:

That action targets VSTP loop protection: The VLAN avoids persistent bridging loops while keeping a backup path available. It does not directly resolve the stated VSTP root drift requirement.

C:

That action targets VSTP per-VLAN roots: Each VLAN can elect the specified preferred root and its own forwarding tree. It does not directly resolve the stated VSTP root drift requirement.

D:

That action targets VSTP trunk participation: The VLAN can have its intended spanning-tree state on the shared trunk. It does not directly resolve the stated VSTP root drift requirement.

Question 514

A Junos network engineer takes this step: Restore the planned VSTP bridge priority and root placement for that VLAN. Which outcome most directly follows?

  1. The VLAN can have its intended spanning-tree state on the shared trunk.
  2. The desired distribution switch can regain control of the VLAN's spanning-tree topology.
  3. The VLAN avoids persistent bridging loops while keeping a backup path available.
  4. Each VLAN can elect the specified preferred root and its own forwarding tree.

Explanation

Correct Answer

B:

This is the direct result of the VSTP root drift decision: The desired distribution switch can regain control of the VLAN's spanning-tree topology.

Incorrect Answers

A:

This outcome is associated with VSTP trunk participation (Verify that the VLAN is included in the appropriate VSTP configuration on all relevant trunk links.), not the specified action.

C:

This outcome is associated with VSTP loop protection (Use supported VSTP to calculate forwarding and discarding roles for that VLAN.), not the specified action.

D:

This outcome is associated with VSTP per-VLAN roots (Configure VSTP bridge priorities per VLAN so the intended root differs by VLAN.), not the specified action.

Question 515

A new switch with a lower VLAN-specific bridge priority unexpectedly becomes VSTP root on a production VLAN. A colleague instead suggests: Configure VSTP bridge priorities per VLAN so the intended root differs by VLAN. Which corrective approach most directly addresses the original issue?

  1. Configure VSTP bridge priorities per VLAN so the intended root differs by VLAN.
  2. Use supported VSTP to calculate forwarding and discarding roles for that VLAN.
  3. Restore the planned VSTP bridge priority and root placement for that VLAN.
  4. Verify that the VLAN is included in the appropriate VSTP configuration on all relevant trunk links.

Explanation

Correct Answer

C:

This corrective choice addresses VSTP root drift. The desired distribution switch can regain control of the VLAN's spanning-tree topology.

Incorrect Answers

A:

That alternative applies to VSTP per-VLAN roots instead. Each VLAN can elect the specified preferred root and its own forwarding tree.

B:

That alternative applies to VSTP loop protection instead. The VLAN avoids persistent bridging loops while keeping a backup path available.

D:

That alternative applies to VSTP trunk participation instead. The VLAN can have its intended spanning-tree state on the shared trunk.

Question 516

An enterprise network designer recommends: Restore the planned VSTP bridge priority and root placement for that VLAN. Which situation most clearly calls for this action?

  1. An inter-switch trunk carries multiple VLANs but one VLAN does not participate in the expected VSTP instance.
  2. An access VLAN has two redundant uplinks forming a physical ring and requires a VLAN-specific loop-free topology.
  3. Two VLANs on the same Junos switching domain need distinct preferred root bridges for traffic engineering.
  4. A new switch with a lower VLAN-specific bridge priority unexpectedly becomes VSTP root on a production VLAN.

Explanation

Correct Answer

D:

This case requires the VSTP root drift action. The desired distribution switch can regain control of the VLAN's spanning-tree topology.

Incorrect Answers

A:

This other case would be better matched to Verify that the VLAN is included in the appropriate VSTP configuration on all relevant trunk links. The VLAN can have its intended spanning-tree state on the shared trunk.

B:

This other case would be better matched to Use supported VSTP to calculate forwarding and discarding roles for that VLAN. The VLAN avoids persistent bridging loops while keeping a backup path available.

C:

This other case would be better matched to Configure VSTP bridge priorities per VLAN so the intended root differs by VLAN. Each VLAN can elect the specified preferred root and its own forwarding tree.

Question 517

A redundant trunk is activated after a failure and only one VLAN remains unable to forward across the new path. Which Junos networking action or protocol decision best addresses this requirement?

  1. Inspect VSTP root, path and port-role details before treating the blocking state as a physical fault.
  2. Inspect that VLAN's VSTP port state and topology information on the relevant switches.
  3. Verify that the VLAN is included in the appropriate VSTP configuration on all relevant trunk links.
  4. Use supported VSTP to calculate forwarding and discarding roles for that VLAN.

Explanation

Correct Answer

B:

This action addresses VSTP convergence verification. The troubleshooting effort can isolate a per-VLAN topology or state discrepancy.

Incorrect Answers

A:

That action targets VSTP blocked port: The team can distinguish deliberate loop prevention from physical failure. It does not directly resolve the stated VSTP convergence verification requirement.

C:

That action targets VSTP trunk participation: The VLAN can have its intended spanning-tree state on the shared trunk. It does not directly resolve the stated VSTP convergence verification requirement.

D:

That action targets VSTP loop protection: The VLAN avoids persistent bridging loops while keeping a backup path available. It does not directly resolve the stated VSTP convergence verification requirement.

Question 518

A Junos network engineer takes this step: Inspect that VLAN's VSTP port state and topology information on the relevant switches. Which outcome most directly follows?

  1. The VLAN avoids persistent bridging loops while keeping a backup path available.
  2. The team can distinguish deliberate loop prevention from physical failure.
  3. The troubleshooting effort can isolate a per-VLAN topology or state discrepancy.
  4. The VLAN can have its intended spanning-tree state on the shared trunk.

Explanation

Correct Answer

C:

This is the direct result of the VSTP convergence verification decision: The troubleshooting effort can isolate a per-VLAN topology or state discrepancy.

Incorrect Answers

A:

This outcome is associated with VSTP loop protection (Use supported VSTP to calculate forwarding and discarding roles for that VLAN.), not the specified action.

B:

This outcome is associated with VSTP blocked port (Inspect VSTP root, path and port-role details before treating the blocking state as a physical fault.), not the specified action.

D:

This outcome is associated with VSTP trunk participation (Verify that the VLAN is included in the appropriate VSTP configuration on all relevant trunk links.), not the specified action.

Question 519

A redundant trunk is activated after a failure and only one VLAN remains unable to forward across the new path. A colleague instead suggests: Use supported VSTP to calculate forwarding and discarding roles for that VLAN. Which corrective approach most directly addresses the original issue?

  1. Inspect VSTP root, path and port-role details before treating the blocking state as a physical fault.
  2. Verify that the VLAN is included in the appropriate VSTP configuration on all relevant trunk links.
  3. Use supported VSTP to calculate forwarding and discarding roles for that VLAN.
  4. Inspect that VLAN's VSTP port state and topology information on the relevant switches.

Explanation

Correct Answer

D:

This corrective choice addresses VSTP convergence verification. The troubleshooting effort can isolate a per-VLAN topology or state discrepancy.

Incorrect Answers

A:

That alternative applies to VSTP blocked port instead. The team can distinguish deliberate loop prevention from physical failure.

B:

That alternative applies to VSTP trunk participation instead. The VLAN can have its intended spanning-tree state on the shared trunk.

C:

That alternative applies to VSTP loop protection instead. The VLAN avoids persistent bridging loops while keeping a backup path available.

Question 520

An enterprise network designer recommends: Inspect that VLAN's VSTP port state and topology information on the relevant switches. Which situation most clearly calls for this action?

  1. A redundant trunk is activated after a failure and only one VLAN remains unable to forward across the new path.
  2. An access VLAN has two redundant uplinks forming a physical ring and requires a VLAN-specific loop-free topology.
  3. An inter-switch trunk carries multiple VLANs but one VLAN does not participate in the expected VSTP instance.
  4. An operator believes a VSTP-discarding interface indicates a defective cable despite healthy link status.

Explanation

Correct Answer

A:

This case requires the VSTP convergence verification action. The troubleshooting effort can isolate a per-VLAN topology or state discrepancy.

Incorrect Answers

B:

This other case would be better matched to Use supported VSTP to calculate forwarding and discarding roles for that VLAN. The VLAN avoids persistent bridging loops while keeping a backup path available.

C:

This other case would be better matched to Verify that the VLAN is included in the appropriate VSTP configuration on all relevant trunk links. The VLAN can have its intended spanning-tree state on the shared trunk.

D:

This other case would be better matched to Inspect VSTP root, path and port-role details before treating the blocking state as a physical fault. The team can distinguish deliberate loop prevention from physical failure.

Enterprise Routing and Switching, Professional (JNCIP-ENT) (JN0-650) Practice Tests