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Juniper JN0-364 Practice Test 42

Question 410

A Junos service-provider engineer is reviewing this operational case: An operator sees label157 on one core router and label812 on the next. What specific configuration or diagnostic action BEST implements the intended response? Select ONE best answer.

  1. Verify LDP enablement, link discovery and session transport
  2. Identify outer transport and inner service label positions and the S-bit placement
  3. Configure the loopback interface as passive under the proper area
  4. Map each local incoming label to its corresponding outgoing FEC binding

Explanation

Correct Answer

D:

Map each local incoming label to its corresponding outgoing FEC binding is the best implementation and troubleshooting step for this Junos service-provider case: An operator sees label157 on one core router and label812 on the next. Technical basis: Labels are locally significant and may differ on each hop even when the underlying destination remains the same.

Incorrect Answers

A:

Verify LDP enablement, link discovery and session transport is relevant to the different engineering topic "LDP session discovery", but it is not the most directly supported implementation and troubleshooting step for this precise case: An operator sees label157 on one core router and label812 on the next. the best answer here is: Map each local incoming label to its corresponding outgoing FEC binding.

B:

That option concerns MPLS label-stack header. Labels are locally significant and may differ on each hop even when the underlying destination remains the same.

C:

That option concerns OSPF passive-interface and export policy. Labels are locally significant and may differ on each hop even when the underlying destination remains the same.

Question 411

A Junos service-provider engineer is reviewing this operational case: An operator sees label157 on one core router and label812 on the next. Which observation would MOST RELIABLY verify the intended outcome? Select ONE best answer.

  1. The label swap chain remains consistent despite different numeric labels
  2. The established LSP follows the intended allowed nodes
  3. The fault is isolated to a specific LSP hop or egress context
  4. Eligible peers retain route continuity during the bounded restart

Explanation

Correct Answer

A:

The label swap chain remains consistent despite different numeric labels is the best operational verification evidence for this Junos service-provider case: An operator sees label157 on one core router and label812 on the next. Technical basis: Labels are locally significant and may differ on each hop even when the underlying destination remains the same.

Incorrect Answers

B:

The established LSP follows the intended allowed nodes is relevant to the different engineering topic "RSVP explicit-route constraints", but it is not the most directly supported operational verification evidence for this precise case: An operator sees label157 on one core router and label812 on the next. the best answer here is: The label swap chain remains consistent despite different numeric labels.

C:

That option concerns MPLS end-to-end troubleshooting. Labels are locally significant and may differ on each hop even when the underlying destination remains the same.

D:

That option concerns Graceful restart helper coordination. Labels are locally significant and may differ on each hop even when the underlying destination remains the same.

Question 412

A provider network team identifies this situation: An LSP route cannot install because a next-hop label binding is missing. Which engineering decision BEST fits the stated requirement? Choose ONE best answer.

  1. Use MPLS and RSVP configuration together to create a supported signaled label-switched path
  2. Identify the forwarding equivalence class used to map network traffic to label-switched paths
  3. Use nonstop bridging with its platform-specific GRES dependency when L2 state continuity matters
  4. Verify that a valid label binding exists for the intended FEC before tracing a labeled path

Explanation

Correct Answer

D:

Verify that a valid label binding exists for the intended FEC before tracing a labeled path is the best technical design or decision for this Junos service-provider case: An LSP route cannot install because a next-hop label binding is missing. Technical basis: Labels are locally significant and may differ on each hop even when the underlying destination remains the same.

Incorrect Answers

A:

Use MPLS and RSVP configuration together to create a supported signaled label-switched path is relevant to the different engineering topic "RSVP LSP signaling", but it is not the most directly supported technical design or decision for this precise case: An LSP route cannot install because a next-hop label binding is missing. the best answer here is: Verify that a valid label binding exists for the intended FEC before tracing a labeled path.

B:

That option concerns MPLS forwarding-equivalence classes. Labels are locally significant and may differ on each hop even when the underlying destination remains the same.

C:

That option concerns Nonstop bridging during RE switchover. Labels are locally significant and may differ on each hop even when the underlying destination remains the same.

Question 413

A provider network team identifies this situation: An LSP route cannot install because a next-hop label binding is missing. Which implementation or troubleshooting step is MOST APPROPRIATE here? Choose ONE best answer.

  1. Confirm that SR segment routing need not rely on RSVP per-LSP signaling
  2. Check the transport addresses and route to the neighbor's LDP identifier
  3. Check NDP entries, interface status and address scope
  4. Inspect advertised and received label mappings for the target FEC

Explanation

Correct Answer

D:

Inspect advertised and received label mappings for the target FEC is the best implementation and troubleshooting step for this Junos service-provider case: An LSP route cannot install because a next-hop label binding is missing. Technical basis: Labels are locally significant and may differ on each hop even when the underlying destination remains the same.

Incorrect Answers

A:

Confirm that SR segment routing need not rely on RSVP per-LSP signaling is relevant to the different engineering topic "SR-MPLS shortest-path transport", but it is not the most directly supported implementation and troubleshooting step for this precise case: An LSP route cannot install because a next-hop label binding is missing. the best answer here is: Inspect advertised and received label mappings for the target FEC.

B:

Check the transport addresses and route to the neighbor's LDP identifier is relevant to the different engineering topic "LDP session discovery", but it is not the most directly supported implementation and troubleshooting step for this precise case: An LSP route cannot install because a next-hop label binding is missing. the best answer here is: Inspect advertised and received label mappings for the target FEC.

C:

That option concerns IPv6 neighbor discovery. Labels are locally significant and may differ on each hop even when the underlying destination remains the same.

Question 414

A provider network team identifies this situation: An LSP route cannot install because a next-hop label binding is missing. What verification evidence MOST CLEARLY demonstrates the solution is working? Choose ONE best answer.

  1. The path is validated by IGP SID and label forwarding state
  2. The route becomes eligible after correcting IPv6 reachability
  3. The diagnosed signaling fault is corrected without changing unrelated customer routing
  4. The required downstream binding appears after repair

Explanation

Correct Answer

D:

The required downstream binding appears after repair is the best operational verification evidence for this Junos service-provider case: An LSP route cannot install because a next-hop label binding is missing. Technical basis: Labels are locally significant and may differ on each hop even when the underlying destination remains the same.

Incorrect Answers

A:

The path is validated by IGP SID and label forwarding state is relevant to the different engineering topic "SR-MPLS shortest-path transport", but it is not the most directly supported operational verification evidence for this precise case: An LSP route cannot install because a next-hop label binding is missing. the best answer here is: The required downstream binding appears after repair.

B:

That option concerns IPv6 static route next hop. Labels are locally significant and may differ on each hop even when the underlying destination remains the same.

C:

The diagnosed signaling fault is corrected without changing unrelated customer routing is relevant to the different engineering topic "RSVP LSP signaling", but it is not the most directly supported operational verification evidence for this precise case: An LSP route cannot install because a next-hop label binding is missing. the best answer here is: The required downstream binding appears after repair.

Question 415

A Junos service-provider engineer is reviewing this operational case: A provider prefix is reachable with IP but labeled traffic drops at a transit LSR. Which technical approach MOST DIRECTLY addresses the issue? Select ONE best answer.

  1. Relate a Segment Routing prefix SID to an IGP-advertised prefix and the router's supported label behavior
  2. Use IGP SPF results and segment labels to validate shortest-path SR-MPLS forwarding
  3. Apply BGP's ordered path-selection criteria rather than selecting routes by one attribute in isolation
  4. Distinguish transport routes, MPLS forwarding entries and regular IP routing when troubleshooting

Explanation

Correct Answer

D:

Distinguish transport routes, MPLS forwarding entries and regular IP routing when troubleshooting is the best technical design or decision for this Junos service-provider case: A provider prefix is reachable with IP but labeled traffic drops at a transit LSR. Technical basis: The MPLS label table and forwarding table describe labeled reachability distinct from ordinary inet.0 route existence.

Incorrect Answers

A:

Relate a Segment Routing prefix SID to an IGP-advertised prefix and the router's supported label behavior is relevant to the different engineering topic "Segment-routing MPLS prefix SIDs", but it is not the most directly supported technical design or decision for this precise case: A provider prefix is reachable with IP but labeled traffic drops at a transit LSR. the best answer here is: Distinguish transport routes, MPLS forwarding entries and regular IP routing when troubleshooting.

B:

Use IGP SPF results and segment labels to validate shortest-path SR-MPLS forwarding is relevant to the different engineering topic "SR-MPLS shortest-path transport", but it is not the most directly supported technical design or decision for this precise case: A provider prefix is reachable with IP but labeled traffic drops at a transit LSR. the best answer here is: Distinguish transport routes, MPLS forwarding entries and regular IP routing when troubleshooting.

C:

That option concerns BGP best-path selection order. The MPLS label table and forwarding table describe labeled reachability distinct from ordinary inet.0 route existence.

Question 416

A Junos service-provider engineer is reviewing this operational case: A provider prefix is reachable with IP but labeled traffic drops at a transit LSR. What specific configuration or diagnostic action BEST implements the intended response? Select ONE best answer.

  1. Inspect mpls.0 and relevant forwarding entries for the assigned label
  2. Verify LDP enablement, link discovery and session transport
  3. Inspect how the ingress imposes the outgoing label stack
  4. Set trunk membership to approved VLANs and verify tag handling

Explanation

Correct Answer

A:

Inspect mpls.0 and relevant forwarding entries for the assigned label is the best implementation and troubleshooting step for this Junos service-provider case: A provider prefix is reachable with IP but labeled traffic drops at a transit LSR. Technical basis: The MPLS label table and forwarding table describe labeled reachability distinct from ordinary inet.0 route existence.

Incorrect Answers

B:

That option concerns LDP session discovery. The MPLS label table and forwarding table describe labeled reachability distinct from ordinary inet.0 route existence.

C:

Inspect how the ingress imposes the outgoing label stack is relevant to the different engineering topic "MPLS push swap pop forwarding", but it is not the most directly supported implementation and troubleshooting step for this precise case: A provider prefix is reachable with IP but labeled traffic drops at a transit LSR. the best answer here is: Inspect mpls.0 and relevant forwarding entries for the assigned label.

D:

That option concerns Trunk tagging and VLAN allowlist. The MPLS label table and forwarding table describe labeled reachability distinct from ordinary inet.0 route existence.

Question 417

A Junos service-provider engineer is reviewing this operational case: A provider prefix is reachable with IP but labeled traffic drops at a transit LSR. Which observation would MOST RELIABLY verify the intended outcome? Select ONE best answer.

  1. The failure is localized to RSVP session or path signaling
  2. The fault is isolated to a specific LSP hop or egress context
  3. The incoming label resolves to a valid outgoing action
  4. The core retains root authority and the offending link is protected

Explanation

Correct Answer

C:

The incoming label resolves to a valid outgoing action is the best operational verification evidence for this Junos service-provider case: A provider prefix is reachable with IP but labeled traffic drops at a transit LSR. Technical basis: The MPLS label table and forwarding table describe labeled reachability distinct from ordinary inet.0 route existence.

Incorrect Answers

A:

The failure is localized to RSVP session or path signaling is relevant to the different engineering topic "RSVP session and state troubleshooting", but it is not the most directly supported operational verification evidence for this precise case: A provider prefix is reachable with IP but labeled traffic drops at a transit LSR. the best answer here is: The incoming label resolves to a valid outgoing action.

B:

The fault is isolated to a specific LSP hop or egress context is relevant to the different engineering topic "MPLS end-to-end troubleshooting", but it is not the most directly supported operational verification evidence for this precise case: A provider prefix is reachable with IP but labeled traffic drops at a transit LSR. the best answer here is: The incoming label resolves to a valid outgoing action.

D:

That option concerns Root protection policy. The MPLS label table and forwarding table describe labeled reachability distinct from ordinary inet.0 route existence.

Question 418

A provider network team identifies this situation: An ingress PE selects an LSP but sends ordinary IP traffic instead of labeled packets. Which engineering decision BEST fits the stated requirement? Choose ONE best answer.

  1. Use OSPF neighbor, interface, database and route views to localize control-plane or policy failures
  2. Distinguish transport routes, MPLS forwarding entries and regular IP routing when troubleshooting
  3. Relate a Segment Routing prefix SID to an IGP-advertised prefix and the router's supported label behavior
  4. Use IGP SPF results and segment labels to validate shortest-path SR-MPLS forwarding

Explanation

Correct Answer

B:

Distinguish transport routes, MPLS forwarding entries and regular IP routing when troubleshooting is the best technical design or decision for this Junos service-provider case: An ingress PE selects an LSP but sends ordinary IP traffic instead of labeled packets. Technical basis: The MPLS label table and forwarding table describe labeled reachability distinct from ordinary inet.0 route existence.

Incorrect Answers

A:

That option concerns OSPF operational troubleshooting. The MPLS label table and forwarding table describe labeled reachability distinct from ordinary inet.0 route existence.

C:

Relate a Segment Routing prefix SID to an IGP-advertised prefix and the router's supported label behavior is relevant to the different engineering topic "Segment-routing MPLS prefix SIDs", but it is not the most directly supported technical design or decision for this precise case: An ingress PE selects an LSP but sends ordinary IP traffic instead of labeled packets. the best answer here is: Distinguish transport routes, MPLS forwarding entries and regular IP routing when troubleshooting.

D:

Use IGP SPF results and segment labels to validate shortest-path SR-MPLS forwarding is relevant to the different engineering topic "SR-MPLS shortest-path transport", but it is not the most directly supported technical design or decision for this precise case: An ingress PE selects an LSP but sends ordinary IP traffic instead of labeled packets. the best answer here is: Distinguish transport routes, MPLS forwarding entries and regular IP routing when troubleshooting.

Question 419

A provider network team identifies this situation: An ingress PE selects an LSP but sends ordinary IP traffic instead of labeled packets. Which implementation or troubleshooting step is MOST APPROPRIATE here? Choose ONE best answer.

  1. Clarify the need for separate encryption when confidentiality is required
  2. Compare the observed labels with configured service encapsulation
  3. Review route-to-FEC association and active transport path
  4. Verify route resolution to the intended LSP next hop

Explanation

Correct Answer

D:

Verify route resolution to the intended LSP next hop is the best implementation and troubleshooting step for this Junos service-provider case: An ingress PE selects an LSP but sends ordinary IP traffic instead of labeled packets. Technical basis: The MPLS label table and forwarding table describe labeled reachability distinct from ordinary inet.0 route existence.

Incorrect Answers

A:

That option concerns GRE encapsulation purpose. The MPLS label table and forwarding table describe labeled reachability distinct from ordinary inet.0 route existence.

B:

Compare the observed labels with configured service encapsulation is relevant to the different engineering topic "MPLS label-stack header", but it is not the most directly supported implementation and troubleshooting step for this precise case: An ingress PE selects an LSP but sends ordinary IP traffic instead of labeled packets. the best answer here is: Verify route resolution to the intended LSP next hop.

C:

Review route-to-FEC association and active transport path is relevant to the different engineering topic "MPLS forwarding-equivalence classes", but it is not the most directly supported implementation and troubleshooting step for this precise case: An ingress PE selects an LSP but sends ordinary IP traffic instead of labeled packets. the best answer here is: Verify route resolution to the intended LSP next hop.

Question 420

A provider network team identifies this situation: An ingress PE selects an LSP but sends ordinary IP traffic instead of labeled packets. What verification evidence MOST CLEARLY demonstrates the solution is working? Choose ONE best answer.

  1. The LSP stabilizes after the relevant signaling restriction is corrected
  2. The path is validated by IGP SID and label forwarding state
  3. The forwarding path uses the configured labeled transport route
  4. Selected best paths reflect intended internal exit policy

Explanation

Correct Answer

C:

The forwarding path uses the configured labeled transport route is the best operational verification evidence for this Junos service-provider case: An ingress PE selects an LSP but sends ordinary IP traffic instead of labeled packets. Technical basis: The MPLS label table and forwarding table describe labeled reachability distinct from ordinary inet.0 route existence.

Incorrect Answers

A:

The LSP stabilizes after the relevant signaling restriction is corrected is relevant to the different engineering topic "RSVP session and state troubleshooting", but it is not the most directly supported operational verification evidence for this precise case: An ingress PE selects an LSP but sends ordinary IP traffic instead of labeled packets. the best answer here is: The forwarding path uses the configured labeled transport route.

B:

The path is validated by IGP SID and label forwarding state is relevant to the different engineering topic "SR-MPLS shortest-path transport", but it is not the most directly supported operational verification evidence for this precise case: An ingress PE selects an LSP but sends ordinary IP traffic instead of labeled packets. the best answer here is: The forwarding path uses the configured labeled transport route.

D:

That option concerns BGP local preference selection. The MPLS label table and forwarding table describe labeled reachability distinct from ordinary inet.0 route existence.

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