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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 48

Question 470

A Junos network engineer takes this step: Assign an appropriate lower bridge priority to the intended root for that instance. 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. The network retains redundancy while avoiding a persistent Layer 2 loop.
  4. MSTP root bridge election can select the designated distribution switch.

Explanation

Correct Answer

D:

This is the direct result of the MSTP root election decision: MSTP root bridge election can select the designated distribution switch.

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

Question 471

The wrong distribution switch becomes the spanning-tree root for a critical MST instance after a topology expansion. A colleague instead suggests: Rely on MSTP alternate or discarding port roles to block the redundant active path. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

A:

This corrective choice addresses MSTP root election. MSTP root bridge election can select the designated distribution switch.

Incorrect Answers

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 boundary mismatch instead. The inconsistent device can be identified and corrected rather than treated as an internal peer.

D:

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

Question 472

An enterprise network designer recommends: Assign an appropriate lower bridge priority to the intended root for that instance. 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 triangle of Layer 2 links would create a forwarding loop unless one redundant interface stops forwarding user traffic.
  4. A newly connected switch has an MSTP region digest mismatch and cannot participate as an internal member of the planned region.

Explanation

Correct Answer

B:

This case requires the MSTP root election action. MSTP root bridge election can select the designated distribution switch.

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.

C:

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.

D:

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.

Question 473

A blocked redundant path is unexpectedly chosen as the preferred forwarding link because its spanning-tree cost is too low. 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. Inspect MSTP instance root, interface roles, path costs and port states.
  4. Map the VLANs to appropriate separate MST instances in the common region configuration.

Explanation

Correct Answer

A:

This action addresses MSTP path cost. Spanning-tree can favor the intended lower-cost root path.

Incorrect Answers

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 path cost requirement.

C:

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 path cost requirement.

D:

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

Question 474

A Junos network engineer takes this step: Tune the appropriate MSTP port cost to represent the desired physical path preference. Which outcome most directly follows?

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

Explanation

Correct Answer

B:

This is the direct result of the MSTP path cost decision: Spanning-tree can favor the intended lower-cost root path.

Incorrect Answers

A:

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.

C:

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

D:

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.

Question 475

A blocked redundant path is unexpectedly chosen as the preferred forwarding link because its spanning-tree cost is too low. A colleague instead suggests: Map the VLANs to appropriate separate MST instances in the common region configuration. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

C:

This corrective choice addresses MSTP path cost. Spanning-tree can favor the intended lower-cost root path.

Incorrect Answers

A:

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

B:

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 instance VLAN map instead. Different VLAN groups can follow independently optimized instance trees.

Question 476

An enterprise network designer recommends: Tune the appropriate MSTP port cost to represent the desired physical path preference. Which situation most clearly calls for this action?

  1. Three switches are intended to form one MSTP region but one switch uses a different region revision and behaves as a boundary.
  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. A blocked redundant path is unexpectedly chosen as the preferred forwarding link because its spanning-tree cost is too low.

Explanation

Correct Answer

D:

This case requires the MSTP path cost action. Spanning-tree can favor the intended lower-cost root path.

Incorrect Answers

A:

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.

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.

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.

Question 477

A triangle of Layer 2 links would create a forwarding loop unless one redundant interface stops forwarding user traffic. Which Junos networking action or protocol decision best addresses this requirement?

  1. Allow MSTP reconvergence to transition the eligible alternate path according to its state machine.
  2. Assign an appropriate lower bridge priority to the intended root for that instance.
  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

C:

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

Incorrect Answers

A:

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 alternate port requirement.

B:

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

D:

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 alternate port requirement.

Question 478

A Junos network engineer takes this step: Rely on MSTP alternate or discarding port roles to block the redundant active path. Which outcome most directly follows?

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

Explanation

Correct Answer

D:

This is the direct result of the MSTP alternate port decision: The network retains redundancy while avoiding a persistent Layer 2 loop.

Incorrect Answers

A:

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.

B:

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

C:

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.

Question 479

A triangle of Layer 2 links would create a forwarding loop unless one redundant interface stops forwarding user traffic. A colleague instead suggests: Compare the VLAN-to-instance map and region attributes for exact consistency. Which corrective approach most directly addresses the original issue?

  1. Rely on MSTP alternate or discarding port roles to block the redundant active path.
  2. Compare the VLAN-to-instance map and region attributes for exact consistency.
  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

A:

This corrective choice addresses MSTP alternate port. The network retains redundancy while avoiding a persistent Layer 2 loop.

Incorrect Answers

B:

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

C:

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

D:

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

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.

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