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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 50

Question 490

A Junos network engineer takes this step: Inspect MSTP instance root, interface roles, path costs and port states. Which outcome most directly follows?

  1. The engineer can determine which port is root, designated, or alternate for the instance.
  2. Spanning-tree can favor the intended lower-cost root path.
  3. The devices can recognize matching MSTP configuration identifiers and join the same region.
  4. Different VLAN groups can follow independently optimized instance trees.

Explanation

Correct Answer

A:

This is the direct result of the MSTP monitoring decision: The engineer can determine which port is root, designated, or alternate for the instance.

Incorrect Answers

B:

This outcome is associated with MSTP path cost (Tune the appropriate MSTP port cost to represent the desired physical path preference.), not the specified action.

C:

This outcome is associated with MSTP region consistency (Align the MST region name, revision and VLAN-to-instance mapping across the members.), not the specified action.

D:

This outcome is associated with MSTP instance VLAN map (Map the VLANs to appropriate separate MST instances in the common region configuration.), not the specified action.

Question 491

A redundant uplink is discarding frames and network operations must know whether the state is normal spanning-tree behavior. A colleague instead suggests: Align the MST region name, revision and VLAN-to-instance mapping across the members. Which corrective approach most directly addresses the original issue?

  1. Tune the appropriate MSTP port cost to represent the desired physical path preference.
  2. Inspect MSTP instance root, interface roles, path costs and port states.
  3. Map the VLANs to appropriate separate MST instances in the common region configuration.
  4. Align the MST region name, revision and VLAN-to-instance mapping across the members.

Explanation

Correct Answer

B:

This corrective choice addresses MSTP monitoring. The engineer can determine which port is root, designated, or alternate for the instance.

Incorrect Answers

A:

That alternative applies to MSTP path cost instead. Spanning-tree can favor the intended lower-cost root path.

C:

That alternative applies to MSTP instance VLAN map instead. Different VLAN groups can follow independently optimized instance trees.

D:

That alternative applies to MSTP region consistency instead. The devices can recognize matching MSTP configuration identifiers and join the same region.

Question 492

An enterprise network designer recommends: Inspect MSTP instance root, interface roles, path costs and port states. Which situation most clearly calls for this action?

  1. A blocked redundant path is unexpectedly chosen as the preferred forwarding link because its spanning-tree cost is too low.
  2. VLAN 100 should use a different spanning-tree forwarding topology than VLAN 200, but both map to one MST instance.
  3. A redundant uplink is discarding frames and network operations must know whether the state is normal spanning-tree behavior.
  4. Three switches are intended to form one MSTP region but one switch uses a different region revision and behaves as a boundary.

Explanation

Correct Answer

C:

This case requires the MSTP monitoring action. The engineer can determine which port is root, designated, or alternate for the instance.

Incorrect Answers

A:

This other case would be better matched to Tune the appropriate MSTP port cost to represent the desired physical path preference. Spanning-tree can favor the intended lower-cost root path.

B:

This other case would be better matched to Map the VLANs to appropriate separate MST instances in the common region configuration. Different VLAN groups can follow independently optimized instance trees.

D:

This other case would be better matched to Align the MST region name, revision and VLAN-to-instance mapping across the members. The devices can recognize matching MSTP configuration identifiers and join the same region.

Question 493

An active forwarding uplink fails and a previously alternate path must carry traffic without bridging loops. Which Junos networking action or protocol decision best addresses this requirement?

  1. Compare the VLAN-to-instance map and region attributes for exact consistency.
  2. Allow MSTP reconvergence to transition the eligible alternate path according to its state machine.
  3. Assign an appropriate lower bridge priority to the intended root for that instance.
  4. Rely on MSTP alternate or discarding port roles to block the redundant active path.

Explanation

Correct Answer

B:

This action addresses MSTP topology change. The switched network can restore Layer 2 connectivity on a loop-free replacement path.

Incorrect Answers

A:

That action targets MSTP boundary mismatch: The inconsistent device can be identified and corrected rather than treated as an internal peer. It does not directly resolve the stated MSTP topology change requirement.

C:

That action targets MSTP root election: MSTP root bridge election can select the designated distribution switch. It does not directly resolve the stated MSTP topology change requirement.

D:

That action targets MSTP alternate port: The network retains redundancy while avoiding a persistent Layer 2 loop. It does not directly resolve the stated MSTP topology change requirement.

Question 494

A Junos network engineer takes this step: Allow MSTP reconvergence to transition the eligible alternate path according to its state machine. Which outcome most directly follows?

  1. The inconsistent device can be identified and corrected rather than treated as an internal peer.
  2. The network retains redundancy while avoiding a persistent Layer 2 loop.
  3. The switched network can restore Layer 2 connectivity on a loop-free replacement path.
  4. MSTP root bridge election can select the designated distribution switch.

Explanation

Correct Answer

C:

This is the direct result of the MSTP topology change decision: The switched network can restore Layer 2 connectivity on a loop-free replacement path.

Incorrect Answers

A:

This outcome is associated with MSTP boundary mismatch (Compare the VLAN-to-instance map and region attributes for exact consistency.), not the specified action.

B:

This outcome is associated with MSTP alternate port (Rely on MSTP alternate or discarding port roles to block the redundant active path.), not the specified action.

D:

This outcome is associated with MSTP root election (Assign an appropriate lower bridge priority to the intended root for that instance.), not the specified action.

Question 495

An active forwarding uplink fails and a previously alternate path must carry traffic without bridging loops. A colleague instead suggests: Assign an appropriate lower bridge priority to the intended root for that instance. Which corrective approach most directly addresses the original issue?

  1. Compare the VLAN-to-instance map and region attributes for exact consistency.
  2. Rely on MSTP alternate or discarding port roles to block the redundant active path.
  3. Assign an appropriate lower bridge priority to the intended root for that instance.
  4. Allow MSTP reconvergence to transition the eligible alternate path according to its state machine.

Explanation

Correct Answer

D:

This corrective choice addresses MSTP topology change. The switched network can restore Layer 2 connectivity on a loop-free replacement path.

Incorrect Answers

A:

That alternative applies to MSTP boundary mismatch instead. The inconsistent device can be identified and corrected rather than treated as an internal peer.

B:

That alternative applies to MSTP alternate port instead. The network retains redundancy while avoiding a persistent Layer 2 loop.

C:

That alternative applies to MSTP root election instead. MSTP root bridge election can select the designated distribution switch.

Question 496

An enterprise network designer recommends: Allow MSTP reconvergence to transition the eligible alternate path according to its state machine. Which situation most clearly calls for this action?

  1. An active forwarding uplink fails and a previously alternate path must carry traffic without bridging loops.
  2. A newly connected switch has an MSTP region digest mismatch and cannot participate as an internal member of the planned region.
  3. The wrong distribution switch becomes the spanning-tree root for a critical MST instance after a topology expansion.
  4. A triangle of Layer 2 links would create a forwarding loop unless one redundant interface stops forwarding user traffic.

Explanation

Correct Answer

A:

This case requires the MSTP topology change action. The switched network can restore Layer 2 connectivity on a loop-free replacement path.

Incorrect Answers

B:

This other case would be better matched to Compare the VLAN-to-instance map and region attributes for exact consistency. The inconsistent device can be identified and corrected rather than treated as an internal peer.

C:

This other case would be better matched to Assign an appropriate lower bridge priority to the intended root for that instance. MSTP root bridge election can select the designated distribution switch.

D:

This other case would be better matched to Rely on MSTP alternate or discarding port roles to block the redundant active path. The network retains redundancy while avoiding a persistent Layer 2 loop.

Question 497

Two VLANs on the same Junos switching domain need distinct preferred root bridges for traffic engineering. 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. Configure VSTP bridge priorities per VLAN so the intended root differs by VLAN.
  3. Verify that the VLAN is included in the appropriate VSTP configuration on all relevant trunk links.
  4. Restore the planned VSTP bridge priority and root placement for that VLAN.

Explanation

Correct Answer

B:

This action addresses VSTP per-VLAN roots. Each VLAN can elect the specified preferred root and its own forwarding tree.

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 per-VLAN roots 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 per-VLAN roots 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 per-VLAN roots requirement.

Question 498

A Junos network engineer takes this step: Configure VSTP bridge priorities per VLAN so the intended root differs by VLAN. Which outcome most directly follows?

  1. The desired distribution switch can regain control of the VLAN's spanning-tree topology.
  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 team can distinguish deliberate loop prevention from physical failure.

Explanation

Correct Answer

C:

This is the direct result of the VSTP per-VLAN roots decision: Each VLAN can elect the specified preferred root and its own forwarding tree.

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

D:

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 499

Two VLANs on the same Junos switching domain need distinct preferred root bridges for traffic engineering. A colleague instead suggests: Verify that the VLAN is included in the appropriate VSTP configuration on all relevant trunk links. 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. Restore the planned VSTP bridge priority and root placement for that VLAN.
  4. Configure VSTP bridge priorities per VLAN so the intended root differs by VLAN.

Explanation

Correct Answer

D:

This corrective choice addresses VSTP per-VLAN roots. Each VLAN can elect the specified preferred root and its own forwarding tree.

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

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.

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