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Juniper JN0-364 Practice Test 35

Question 340

A provider network team identifies this situation: A one-way fiber failure leaves a redundant bridged topology at risk. Which engineering decision BEST fits the stated requirement? Choose ONE best answer.

  1. Use loop protection on an appropriate STP port to avoid unsafe forwarding when expected BPDUs disappear
  2. Check BPDU exchange and control-plane filtering when spanning-tree connectivity is unstable
  3. Use OSPF neighbor, interface, database and route views to localize control-plane or policy failures
  4. Use BPDU protection at true edge ports to react to unexpected switches

Explanation

Correct Answer

B:

Check BPDU exchange and control-plane filtering when spanning-tree connectivity is unstable is the best technical design or decision for this Junos service-provider case: A one-way fiber failure leaves a redundant bridged topology at risk. Technical basis: BPDUs carry spanning-tree control information and must be exchanged on appropriate enabled links.

Incorrect Answers

A:

Use loop protection on an appropriate STP port to avoid unsafe forwarding when expected BPDUs disappear is relevant to the different engineering topic "Loop protection when BPDUs vanish", but it is not the most directly supported technical design or decision for this precise case: A one-way fiber failure leaves a redundant bridged topology at risk. the best answer here is: Check BPDU exchange and control-plane filtering when spanning-tree connectivity is unstable.

C:

That option concerns OSPF operational troubleshooting. BPDUs carry spanning-tree control information and must be exchanged on appropriate enabled links.

D:

Use BPDU protection at true edge ports to react to unexpected switches is relevant to the different engineering topic "BPDU protection for edge ports", but it is not the most directly supported technical design or decision for this precise case: A one-way fiber failure leaves a redundant bridged topology at risk. the best answer here is: Check BPDU exchange and control-plane filtering when spanning-tree connectivity is unstable.

Question 341

A provider network team identifies this situation: A one-way fiber failure leaves a redundant bridged topology at risk. Which implementation or troubleshooting step is MOST APPROPRIATE here? Choose ONE best answer.

  1. Inspect inherited group settings and peer overrides
  2. Inspect loss of BPDU reception and directionality
  3. Investigate BPDU reception and link failure protection before forcing ports forwarding
  4. Inspect BPDU protection events and remove unintended bridge attachment

Explanation

Correct Answer

C:

Investigate BPDU reception and link failure protection before forcing ports forwarding is the best implementation and troubleshooting step for this Junos service-provider case: A one-way fiber failure leaves a redundant bridged topology at risk. Technical basis: BPDUs carry spanning-tree control information and must be exchanged on appropriate enabled links.

Incorrect Answers

A:

That option concerns BGP peer-group policy inheritance. BPDUs carry spanning-tree control information and must be exchanged on appropriate enabled links.

B:

Inspect loss of BPDU reception and directionality is relevant to the different engineering topic "Loop protection when BPDUs vanish", but it is not the most directly supported implementation and troubleshooting step for this precise case: A one-way fiber failure leaves a redundant bridged topology at risk. the best answer here is: Investigate BPDU reception and link failure protection before forcing ports forwarding.

D:

Inspect BPDU protection events and remove unintended bridge attachment is relevant to the different engineering topic "BPDU protection for edge ports", but it is not the most directly supported implementation and troubleshooting step for this precise case: A one-way fiber failure leaves a redundant bridged topology at risk. the best answer here is: Investigate BPDU reception and link failure protection before forcing ports forwarding.

Question 342

A provider network team identifies this situation: A one-way fiber failure leaves a redundant bridged topology at risk. What verification evidence MOST CLEARLY demonstrates the solution is working? Choose ONE best answer.

  1. The topology remains loop-free after correcting control reception
  2. Only the intended VLAN's root and port roles change
  3. IPv6 overlay packets pass when underlay transport is restored
  4. Endpoint traffic begins rapidly without weakening transit loop protection

Explanation

Correct Answer

A:

The topology remains loop-free after correcting control reception is the best operational verification evidence for this Junos service-provider case: A one-way fiber failure leaves a redundant bridged topology at risk. Technical basis: BPDUs carry spanning-tree control information and must be exchanged on appropriate enabled links.

Incorrect Answers

B:

That option concerns VSTP per-VLAN tree behavior. BPDUs carry spanning-tree control information and must be exchanged on appropriate enabled links.

C:

That option concerns IPv6-over-IPv4 tunnel migration. BPDUs carry spanning-tree control information and must be exchanged on appropriate enabled links.

D:

Endpoint traffic begins rapidly without weakening transit loop protection is relevant to the different engineering topic "Spanning-tree troubleshooting and edge settings", but it is not the most directly supported operational verification evidence for this precise case: A one-way fiber failure leaves a redundant bridged topology at risk. the best answer here is: The topology remains loop-free after correcting control reception.

Question 343

A Junos service-provider engineer is reviewing this operational case: A redundant point-to-point uplink needs faster recovery than classic STP. Which technical approach MOST DIRECTLY addresses the issue? Select ONE best answer.

  1. Use RSTP's rapid convergence mechanisms for supported point-to-point and edge roles
  2. Use BPDU protection at true edge ports to react to unexpected switches
  3. Use BGP groups to share policy and common parameters while retaining correct peer-specific settings
  4. Use VSTP only when per-VLAN spanning-tree operation is actually desired and supported

Explanation

Correct Answer

A:

Use RSTP's rapid convergence mechanisms for supported point-to-point and edge roles is the best technical design or decision for this Junos service-provider case: A redundant point-to-point uplink needs faster recovery than classic STP. Technical basis: RSTP improves convergence using roles and proposal-agreement behavior under appropriate link conditions.

Incorrect Answers

B:

That option concerns BPDU protection for edge ports. RSTP improves convergence using roles and proposal-agreement behavior under appropriate link conditions.

C:

That option concerns BGP peer-group policy inheritance. RSTP improves convergence using roles and proposal-agreement behavior under appropriate link conditions.

D:

Use VSTP only when per-VLAN spanning-tree operation is actually desired and supported is relevant to the different engineering topic "VSTP per-VLAN tree behavior", but it is not the most directly supported technical design or decision for this precise case: A redundant point-to-point uplink needs faster recovery than classic STP. the best answer here is: Use RSTP's rapid convergence mechanisms for supported point-to-point and edge roles.

Question 344

A Junos service-provider engineer is reviewing this operational case: A redundant point-to-point uplink needs faster recovery than classic STP. What specific configuration or diagnostic action BEST implements the intended response? Select ONE best answer.

  1. Enable supported RSTP and verify the correct point-to-point role handling
  2. Configure an allowed RIB group with the intended table ordering and policy
  3. Compare region name, revision and VLAN mapping
  4. Apply supported loop protection at the appropriate role

Explanation

Correct Answer

A:

Enable supported RSTP and verify the correct point-to-point role handling is the best implementation and troubleshooting step for this Junos service-provider case: A redundant point-to-point uplink needs faster recovery than classic STP. Technical basis: RSTP improves convergence using roles and proposal-agreement behavior under appropriate link conditions.

Incorrect Answers

B:

That option concerns RIB-group route sharing. RSTP improves convergence using roles and proposal-agreement behavior under appropriate link conditions.

C:

Compare region name, revision and VLAN mapping is relevant to the different engineering topic "MSTP region consistency", but it is not the most directly supported implementation and troubleshooting step for this precise case: A redundant point-to-point uplink needs faster recovery than classic STP. the best answer here is: Enable supported RSTP and verify the correct point-to-point role handling.

D:

That option concerns Loop protection when BPDUs vanish. RSTP improves convergence using roles and proposal-agreement behavior under appropriate link conditions.

Question 345

A Junos service-provider engineer is reviewing this operational case: A redundant point-to-point uplink needs faster recovery than classic STP. Which observation would MOST RELIABLY verify the intended outcome? Select ONE best answer.

  1. Each VLAN uses the appropriate elected root
  2. The new device participates in the intended region
  3. The alternate path transitions appropriately when the active link fails
  4. The advertised default withdraws when the required valid contribution disappears

Explanation

Correct Answer

C:

The alternate path transitions appropriately when the active link fails is the best operational verification evidence for this Junos service-provider case: A redundant point-to-point uplink needs faster recovery than classic STP. Technical basis: RSTP improves convergence using roles and proposal-agreement behavior under appropriate link conditions.

Incorrect Answers

A:

Each VLAN uses the appropriate elected root is relevant to the different engineering topic "VSTP per-VLAN tree behavior", but it is not the most directly supported operational verification evidence for this precise case: A redundant point-to-point uplink needs faster recovery than classic STP. the best answer here is: The alternate path transitions appropriately when the active link fails.

B:

The new device participates in the intended region is relevant to the different engineering topic "MSTP region consistency", but it is not the most directly supported operational verification evidence for this precise case: A redundant point-to-point uplink needs faster recovery than classic STP. the best answer here is: The alternate path transitions appropriately when the active link fails.

D:

That option concerns Generated-route dependencies. RSTP improves convergence using roles and proposal-agreement behavior under appropriate link conditions.

Question 346

A provider network team identifies this situation: A switch experiences prolonged reconvergence despite RSTP being configured. Which engineering decision BEST fits the stated requirement? Choose ONE best answer.

  1. Identify the forwarding equivalence class used to map network traffic to label-switched paths
  2. Use RSTP's rapid convergence mechanisms for supported point-to-point and edge roles
  3. Check correct edge designation and port roles before overriding an STP blocking decision
  4. Ensure MSTP region name, revision and VLAN-to-instance mapping agree across the intended switches

Explanation

Correct Answer

B:

Use RSTP's rapid convergence mechanisms for supported point-to-point and edge roles is the best technical design or decision for this Junos service-provider case: A switch experiences prolonged reconvergence despite RSTP being configured. Technical basis: RSTP improves convergence using roles and proposal-agreement behavior under appropriate link conditions.

Incorrect Answers

A:

That option concerns MPLS forwarding-equivalence classes. RSTP improves convergence using roles and proposal-agreement behavior under appropriate link conditions.

C:

Check correct edge designation and port roles before overriding an STP blocking decision is relevant to the different engineering topic "Spanning-tree troubleshooting and edge settings", but it is not the most directly supported technical design or decision for this precise case: A switch experiences prolonged reconvergence despite RSTP being configured. the best answer here is: Use RSTP's rapid convergence mechanisms for supported point-to-point and edge roles.

D:

Ensure MSTP region name, revision and VLAN-to-instance mapping agree across the intended switches is relevant to the different engineering topic "MSTP region consistency", but it is not the most directly supported technical design or decision for this precise case: A switch experiences prolonged reconvergence despite RSTP being configured. the best answer here is: Use RSTP's rapid convergence mechanisms for supported point-to-point and edge roles.

Question 347

A provider network team identifies this situation: A switch experiences prolonged reconvergence despite RSTP being configured. Which implementation or troubleshooting step is MOST APPROPRIATE here? Choose ONE best answer.

  1. Validate root priority controls before allowing production topology changes
  2. Check port type, edge settings and neighbor protocol compatibility
  3. Confirm that SR segment routing need not rely on RSVP per-LSP signaling
  4. Investigate BPDU reception and link failure protection before forcing ports forwarding

Explanation

Correct Answer

B:

Check port type, edge settings and neighbor protocol compatibility is the best implementation and troubleshooting step for this Junos service-provider case: A switch experiences prolonged reconvergence despite RSTP being configured. Technical basis: RSTP improves convergence using roles and proposal-agreement behavior under appropriate link conditions.

Incorrect Answers

A:

That option concerns STP root bridge placement. RSTP improves convergence using roles and proposal-agreement behavior under appropriate link conditions.

C:

That option concerns SR-MPLS shortest-path transport. RSTP improves convergence using roles and proposal-agreement behavior under appropriate link conditions.

D:

That option concerns BPDU visibility on trunks. RSTP improves convergence using roles and proposal-agreement behavior under appropriate link conditions.

Question 348

A provider network team identifies this situation: A switch experiences prolonged reconvergence despite RSTP being configured. What verification evidence MOST CLEARLY demonstrates the solution is working? Choose ONE best answer.

  1. Endpoint traffic begins rapidly without weakening transit loop protection
  2. Port roles follow the approved shortest path design
  3. Operational roles permit the intended rapid transition
  4. The corrected context learns only authorized MAC addresses

Explanation

Correct Answer

C:

Operational roles permit the intended rapid transition is the best operational verification evidence for this Junos service-provider case: A switch experiences prolonged reconvergence despite RSTP being configured. Technical basis: RSTP improves convergence using roles and proposal-agreement behavior under appropriate link conditions.

Incorrect Answers

A:

Endpoint traffic begins rapidly without weakening transit loop protection is relevant to the different engineering topic "Spanning-tree troubleshooting and edge settings", but it is not the most directly supported operational verification evidence for this precise case: A switch experiences prolonged reconvergence despite RSTP being configured. the best answer here is: Operational roles permit the intended rapid transition.

B:

That option concerns STP root and designated port roles. RSTP improves convergence using roles and proposal-agreement behavior under appropriate link conditions.

D:

That option concerns Virtual-switch routing instance. RSTP improves convergence using roles and proposal-agreement behavior under appropriate link conditions.

Question 349

A Junos service-provider engineer is reviewing this operational case: An enterprise adds a switch that unexpectedly appears at an MST region boundary. Which technical approach MOST DIRECTLY addresses the issue? Select ONE best answer.

  1. Ensure MSTP region name, revision and VLAN-to-instance mapping agree across the intended switches
  2. Plan iBGP route distribution with ordinary split-horizon constraints and required topology alternatives
  3. Check BPDU exchange and control-plane filtering when spanning-tree connectivity is unstable
  4. Use VSTP only when per-VLAN spanning-tree operation is actually desired and supported

Explanation

Correct Answer

A:

Ensure MSTP region name, revision and VLAN-to-instance mapping agree across the intended switches is the best technical design or decision for this Junos service-provider case: An enterprise adds a switch that unexpectedly appears at an MST region boundary. Technical basis: MSTP maps VLANs to shared spanning-tree instances within a consistent region and digest.

Incorrect Answers

B:

That option concerns IBGP route propagation constraints. MSTP maps VLANs to shared spanning-tree instances within a consistent region and digest.

C:

Check BPDU exchange and control-plane filtering when spanning-tree connectivity is unstable is relevant to the different engineering topic "BPDU visibility on trunks", but it is not the most directly supported technical design or decision for this precise case: An enterprise adds a switch that unexpectedly appears at an MST region boundary. the best answer here is: Ensure MSTP region name, revision and VLAN-to-instance mapping agree across the intended switches.

D:

That option concerns VSTP per-VLAN tree behavior. MSTP maps VLANs to shared spanning-tree instances within a consistent region and digest.

Question 350

A Junos service-provider engineer is reviewing this operational case: An enterprise adds a switch that unexpectedly appears at an MST region boundary. What specific configuration or diagnostic action BEST implements the intended response? Select ONE best answer.

  1. Review acceptable MED policy and path comparison behavior
  2. Inspect BPDU counters and filtering on participating ports
  3. Apply supported loop protection at the appropriate role
  4. Compare region name, revision and VLAN mapping

Explanation

Correct Answer

D:

Compare region name, revision and VLAN mapping is the best implementation and troubleshooting step for this Junos service-provider case: An enterprise adds a switch that unexpectedly appears at an MST region boundary. Technical basis: MSTP maps VLANs to shared spanning-tree instances within a consistent region and digest.

Incorrect Answers

A:

That option concerns BGP MED and peer comparison. MSTP maps VLANs to shared spanning-tree instances within a consistent region and digest.

B:

Inspect BPDU counters and filtering on participating ports is relevant to the different engineering topic "BPDU visibility on trunks", but it is not the most directly supported implementation and troubleshooting step for this precise case: An enterprise adds a switch that unexpectedly appears at an MST region boundary. the best answer here is: Compare region name, revision and VLAN mapping.

C:

Apply supported loop protection at the appropriate role is relevant to the different engineering topic "Loop protection when BPDUs vanish", but it is not the most directly supported implementation and troubleshooting step for this precise case: An enterprise adds a switch that unexpectedly appears at an MST region boundary. the best answer here is: Compare region name, revision and VLAN mapping.

Service Provider Routing and Switching, Specialist (JNCIS-SP) (JN0-364) Practice Tests