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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 51

Question 500

An enterprise network designer recommends: Configure VSTP bridge priorities per VLAN so the intended root differs by VLAN. Which situation most clearly calls for this action?

  1. Two VLANs on the same Junos switching domain need distinct preferred root bridges for traffic engineering.
  2. A new switch with a lower VLAN-specific bridge priority unexpectedly becomes VSTP root on a production VLAN.
  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 per-VLAN roots action. Each VLAN can elect the specified preferred root and its own forwarding tree.

Incorrect Answers

B:

This other case would be better matched to Restore the planned VSTP bridge priority and root placement for that VLAN. The desired distribution switch can regain control of the VLAN's spanning-tree topology.

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.

Question 501

An access VLAN has two redundant uplinks forming a physical ring and requires a VLAN-specific loop-free topology. Which Junos networking action or protocol decision best addresses this requirement?

  1. Inspect that VLAN's VSTP port state and topology information on the relevant switches.
  2. Inspect VSTP root, path and port-role details before treating the blocking state as a physical fault.
  3. Use supported VSTP to calculate forwarding and discarding roles for that VLAN.
  4. Restore the planned VSTP bridge priority and root placement for that VLAN.

Explanation

Correct Answer

C:

This action addresses VSTP loop protection. The VLAN avoids persistent bridging loops while keeping a backup path available.

Incorrect Answers

A:

That action targets VSTP convergence verification: The troubleshooting effort can isolate a per-VLAN topology or state discrepancy. It does not directly resolve the stated VSTP loop protection requirement.

B:

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

D:

That action targets VSTP root drift: The desired distribution switch can regain control of the VLAN's spanning-tree topology. It does not directly resolve the stated VSTP loop protection requirement.

Question 502

A Junos network engineer takes this step: Use supported VSTP to calculate forwarding and discarding roles for that VLAN. Which outcome most directly follows?

  1. The desired distribution switch can regain control of the VLAN's spanning-tree topology.
  2. The troubleshooting effort can isolate a per-VLAN topology or state discrepancy.
  3. The team can distinguish deliberate loop prevention from physical failure.
  4. The VLAN avoids persistent bridging loops while keeping a backup path available.

Explanation

Correct Answer

D:

This is the direct result of the VSTP loop protection decision: The VLAN avoids persistent bridging loops while keeping a backup path available.

Incorrect Answers

A:

This outcome is associated with VSTP root drift (Restore the planned VSTP bridge priority and root placement for that VLAN.), not the specified action.

B:

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.

C:

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.

Question 503

An access VLAN has two redundant uplinks forming a physical ring and requires a VLAN-specific loop-free topology. A colleague instead suggests: Inspect VSTP root, path and port-role details before treating the blocking state as a physical fault. Which corrective approach most directly addresses the original issue?

  1. Use supported VSTP to calculate forwarding and discarding roles for that VLAN.
  2. Inspect that VLAN's VSTP port state and topology information on the relevant switches.
  3. Inspect VSTP root, path and port-role details before treating the blocking state as a physical fault.
  4. Restore the planned VSTP bridge priority and root placement for that VLAN.

Explanation

Correct Answer

A:

This corrective choice addresses VSTP loop protection. The VLAN avoids persistent bridging loops while keeping a backup path available.

Incorrect Answers

B:

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

C:

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

D:

That alternative applies to VSTP root drift instead. The desired distribution switch can regain control of the VLAN's spanning-tree topology.

Question 504

An enterprise network designer recommends: Use supported VSTP to calculate forwarding and discarding roles for that VLAN. 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. A new switch with a lower VLAN-specific bridge priority unexpectedly becomes VSTP root on a production VLAN.
  4. An operator believes a VSTP-discarding interface indicates a defective cable despite healthy link status.

Explanation

Correct Answer

B:

This case requires the VSTP loop protection action. The VLAN avoids persistent bridging loops while keeping a backup path available.

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.

C:

This other case would be better matched to Restore the planned VSTP bridge priority and root placement for that VLAN. The desired distribution switch can regain control of the VLAN's spanning-tree topology.

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.

Question 505

An inter-switch trunk carries multiple VLANs but one VLAN does not participate in the expected VSTP instance. Which Junos networking action or protocol decision best addresses this requirement?

  1. Verify that the VLAN is included in the appropriate VSTP configuration on all relevant trunk links.
  2. Inspect that VLAN's VSTP port state and topology information on the relevant switches.
  3. Configure VSTP bridge priorities per VLAN so the intended root differs by VLAN.
  4. Restore the planned VSTP bridge priority and root placement for that VLAN.

Explanation

Correct Answer

A:

This action addresses VSTP trunk participation. The VLAN can have its intended spanning-tree state on the shared trunk.

Incorrect Answers

B:

That action targets VSTP convergence verification: The troubleshooting effort can isolate a per-VLAN topology or state discrepancy. It does not directly resolve the stated VSTP trunk participation 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 trunk participation requirement.

D:

That action targets VSTP root drift: The desired distribution switch can regain control of the VLAN's spanning-tree topology. It does not directly resolve the stated VSTP trunk participation requirement.

Question 506

A Junos network engineer takes this step: Verify that the VLAN is included in the appropriate VSTP configuration on all relevant trunk links. Which outcome most directly follows?

  1. The troubleshooting effort can isolate a per-VLAN topology or state discrepancy.
  2. The VLAN can have its intended spanning-tree state on the shared trunk.
  3. Each VLAN can elect the specified preferred root and its own forwarding tree.
  4. The desired distribution switch can regain control of the VLAN's spanning-tree topology.

Explanation

Correct Answer

B:

This is the direct result of the VSTP trunk participation decision: The VLAN can have its intended spanning-tree state on the shared trunk.

Incorrect Answers

A:

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.

C:

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.

D:

This outcome is associated with VSTP root drift (Restore the planned VSTP bridge priority and root placement for that VLAN.), not the specified action.

Question 507

An inter-switch trunk carries multiple VLANs but one VLAN does not participate in the expected VSTP instance. A colleague instead suggests: Restore the planned VSTP bridge priority and root placement for that VLAN. Which corrective approach most directly addresses the original issue?

  1. Restore the planned VSTP bridge priority and root placement for that VLAN.
  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. Configure VSTP bridge priorities per VLAN so the intended root differs by VLAN.

Explanation

Correct Answer

C:

This corrective choice addresses VSTP trunk participation. The VLAN can have its intended spanning-tree state on the shared trunk.

Incorrect Answers

A:

That alternative applies to VSTP root drift instead. The desired distribution switch can regain control of the VLAN's spanning-tree topology.

B:

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 per-VLAN roots instead. Each VLAN can elect the specified preferred root and its own forwarding tree.

Question 508

An enterprise network designer recommends: Verify that the VLAN is included in the appropriate VSTP configuration on all relevant trunk links. 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. A new switch with a lower VLAN-specific bridge priority unexpectedly becomes VSTP root on a production VLAN.
  4. An inter-switch trunk carries multiple VLANs but one VLAN does not participate in the expected VSTP instance.

Explanation

Correct Answer

D:

This case requires the VSTP trunk participation action. The VLAN can have its intended spanning-tree state on the shared trunk.

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.

C:

This other case would be better matched to Restore the planned VSTP bridge priority and root placement for that VLAN. The desired distribution switch can regain control of the VLAN's spanning-tree topology.

Question 509

An operator believes a VSTP-discarding interface indicates a defective cable despite healthy link status. Which Junos networking action or protocol decision best addresses this requirement?

  1. Inspect that VLAN's VSTP port state and topology information on the relevant switches.
  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. Inspect VSTP root, path and port-role details before treating the blocking state as a physical fault.

Explanation

Correct Answer

D:

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

Incorrect Answers

A:

That action targets VSTP convergence verification: The troubleshooting effort can isolate a per-VLAN topology or state discrepancy. It does not directly resolve the stated VSTP blocked port requirement.

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 blocked port 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 blocked port requirement.

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.

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