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Exam Code: JN0-650

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

Certification Provider: Juniper

Corresponding Certification: JNCIP-ENT

Questions & Answers

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Juniper JN0-650 Practice Test 49

Question 480

An enterprise network designer recommends: Rely on MSTP alternate or discarding port roles to block the redundant active path. Which situation most clearly calls for this action?

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

Explanation

Correct Answer

B:

This case requires the MSTP alternate port action. The network retains redundancy while avoiding a persistent Layer 2 loop.

Incorrect Answers

A:

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 Allow MSTP reconvergence to transition the eligible alternate path according to its state machine. The switched network can restore Layer 2 connectivity on a loop-free replacement path.

Question 481

VLAN 100 should use a different spanning-tree forwarding topology than VLAN 200, but both map to one MST instance. Which Junos networking action or protocol decision best addresses this requirement?

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

Explanation

Correct Answer

C:

This action addresses MSTP instance VLAN map. Different VLAN groups can follow independently optimized instance trees.

Incorrect Answers

A:

That action targets MSTP path cost: Spanning-tree can favor the intended lower-cost root path. It does not directly resolve the stated MSTP instance VLAN map requirement.

B:

That action targets MSTP region consistency: The devices can recognize matching MSTP configuration identifiers and join the same region. It does not directly resolve the stated MSTP instance VLAN map requirement.

D:

That action targets MSTP monitoring: The engineer can determine which port is root, designated, or alternate for the instance. It does not directly resolve the stated MSTP instance VLAN map requirement.

Question 482

A Junos network engineer takes this step: Map the VLANs to appropriate separate MST instances in the common region configuration. Which outcome most directly follows?

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

Explanation

Correct Answer

D:

This is the direct result of the MSTP instance VLAN map decision: Different VLAN groups can follow independently optimized instance trees.

Incorrect Answers

A:

This outcome is associated with MSTP monitoring (Inspect MSTP instance root, interface roles, path costs and port states.), not the specified action.

B:

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.

C:

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.

Question 483

VLAN 100 should use a different spanning-tree forwarding topology than VLAN 200, but both map to one MST instance. A colleague instead suggests: Inspect MSTP instance root, interface roles, path costs and port states. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

A:

This corrective choice addresses MSTP instance VLAN map. Different VLAN groups can follow independently optimized instance trees.

Incorrect Answers

B:

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

C:

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

D:

That alternative applies to MSTP monitoring instead. The engineer can determine which port is root, designated, or alternate for the instance.

Question 484

An enterprise network designer recommends: Map the VLANs to appropriate separate MST instances in the common region configuration. 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

B:

This case requires the MSTP instance VLAN map action. Different VLAN groups can follow independently optimized instance trees.

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.

C:

This other case would be better matched to Inspect MSTP instance root, interface roles, path costs and port states. The engineer can determine which port is root, designated, or alternate for the instance.

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 485

A newly connected switch has an MSTP region digest mismatch and cannot participate as an internal member of the planned region. Which Junos networking action or protocol decision best addresses this requirement?

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

Explanation

Correct Answer

D:

This action addresses MSTP boundary mismatch. The inconsistent device can be identified and corrected rather than treated as an internal peer.

Incorrect Answers

A:

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

B:

That action targets MSTP topology change: The switched network can restore Layer 2 connectivity on a loop-free replacement path. It does not directly resolve the stated MSTP boundary mismatch requirement.

C:

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 boundary mismatch requirement.

Question 486

A Junos network engineer takes this step: Compare the VLAN-to-instance map and region attributes for exact consistency. Which outcome most directly follows?

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

Explanation

Correct Answer

A:

This is the direct result of the MSTP boundary mismatch decision: The inconsistent device can be identified and corrected rather than treated as an internal peer.

Incorrect Answers

B:

This outcome is associated with MSTP topology change (Allow MSTP reconvergence to transition the eligible alternate path according to its state machine.), not the specified action.

C:

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.

D:

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.

Question 487

A newly connected switch has an MSTP region digest mismatch and cannot participate as an internal member of the planned region. A colleague instead suggests: Allow MSTP reconvergence to transition the eligible alternate path according to its state machine. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

B:

This corrective choice addresses MSTP boundary mismatch. The inconsistent device can be identified and corrected rather than treated as an internal peer.

Incorrect Answers

A:

That alternative applies to MSTP topology change instead. The switched network can restore Layer 2 connectivity on a loop-free replacement path.

C:

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

D:

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

Question 488

An enterprise network designer recommends: Compare the VLAN-to-instance map and region attributes for exact consistency. 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. The wrong distribution switch becomes the spanning-tree root for a critical MST instance after a topology expansion.
  3. A newly connected switch has an MSTP region digest mismatch and cannot participate as an internal member of the planned region.
  4. A triangle of Layer 2 links would create a forwarding loop unless one redundant interface stops forwarding user traffic.

Explanation

Correct Answer

C:

This case requires the MSTP boundary mismatch action. The inconsistent device can be identified and corrected rather than treated as an internal peer.

Incorrect Answers

A:

This other case would be better matched to Allow MSTP reconvergence to transition the eligible alternate path according to its state machine. The switched network can restore Layer 2 connectivity on a loop-free replacement path.

B:

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 489

A redundant uplink is discarding frames and network operations must know whether the state is normal spanning-tree behavior. Which Junos networking action or protocol decision best addresses this requirement?

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

Explanation

Correct Answer

D:

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

Incorrect Answers

A:

That action targets MSTP region consistency: The devices can recognize matching MSTP configuration identifiers and join the same region. It does not directly resolve the stated MSTP monitoring requirement.

B:

That action targets MSTP path cost: Spanning-tree can favor the intended lower-cost root path. It does not directly resolve the stated MSTP monitoring requirement.

C:

That action targets MSTP instance VLAN map: Different VLAN groups can follow independently optimized instance trees. It does not directly resolve the stated MSTP monitoring requirement.

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.

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