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Exam Code: JN0-664

Exam Name: Service Provider Routing and Switching, Professional (JNCIP-SP)

Certification Provider: Juniper

Corresponding Certification: JNCIP-SP

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Juniper JN0-664 Practice Test 16

Question 150

A core uses multiple IS-IS levels on a shared interface. Observed: One neighbor reports only a Level 2 adjacency despite the access level being required. Which acceptance observation best confirms that the proposed change worked?

  1. SPF again selects the primary path and falls back when its link fails.
  2. The configured level adjacencies become operational and level-specific databases are populated.
  3. Route origin stays stable across peers and protocol feedback ceases.
  4. Neighbor adjacency forms at the intended level and LSDB distribution is correct.

Explanation

Correct Answer

B:

This acceptance criterion tests the actual fault. The source evidence was One neighbor reports only a Level 2 adjacency despite the access level being required. The correction addresses is-is level enablement differs between interface configurations; success requires the configured level adjacencies become operational and level-specific databases are populated.

Incorrect Answers

A:

It confirms an unrelated service correction: The remaining interface metric on the repaired circuit is artificially high. The present case reports One neighbor reports only a Level 2 adjacency despite the access level being required. Its completion test is The configured level adjacencies become operational and level-specific databases are populated.

C:

That observation would verify a separate fault involving import and export policy lack route-origin tagging or other feedback suppression. Its symptom is The route repeatedly returns to the protocol it came from. For this case the actual issue is is-is level enablement differs between interface configurations, and the relevant success signal is The configured level adjacencies become operational and level-specific databases are populated.

D:

This result is useful in another case with evidence Neighbors remain Down even though interface transport and timers match. It does not test recovery from one neighbor reports only a level 2 adjacency despite the access level being required. Check instead whether the configured level adjacencies become operational and level-specific databases are populated.

Question 151

A core uses multiple IS-IS levels on a shared interface. Observed: One neighbor reports only a Level 2 adjacency despite the access level being required. What is the most likely source of the observed routing or service failure?

  1. IS-IS level enablement differs between interface configurations.
  2. The remaining interface metric on the repaired circuit is artificially high.
  3. Import and export policy lack route-origin tagging or other feedback suppression.
  4. NET area identifiers disagree for intended Level 1 adjacency.

Explanation

Correct Answer

A:

This explanation is the closest match to the observed symptom: One neighbor reports only a Level 2 adjacency despite the access level being required. The specified root issue is IS-IS level enablement differs between interface configurations. Repair it through match intended Level 1 and Level 2 circuit types on both routers, then check the configured level adjacencies become operational and level-specific databases are populated.

Incorrect Answers

B:

The remaining interface metric on the repaired circuit is artificially high. would normally be accompanied by a high-cost path is selected after a fiber repair. The observed symptom is different: One neighbor reports only a Level 2 adjacency despite the access level being required. The likely cause is IS-IS level enablement differs between interface configurations.

C:

The stated cause is possible elsewhere but explains the route repeatedly returns to the protocol it came from, not one neighbor reports only a level 2 adjacency despite the access level being required. This incident is better attributed to is-is level enablement differs between interface configurations.

D:

That explanation fits another condition: Neighbors remain Down even though interface transport and timers match. The evidence here is One neighbor reports only a Level 2 adjacency despite the access level being required. Its closer root cause is IS-IS level enablement differs between interface configurations.

Question 152

A core uses multiple IS-IS levels on a shared interface. Observed: One neighbor reports only a Level 2 adjacency despite the access level being required. What operational check best guards against this problem returning?

  1. For each approved related change, verify that the configured level adjacencies become operational and level-specific databases are populated. Flag recurrence if one neighbor reports only a Level 2 adjacency despite the access level being required.
  2. For each approved related change, verify that neighbor adjacency forms at the intended level and LSDB distribution is correct. Flag recurrence if neighbors remain Down even though interface transport and timers match.
  3. For each approved related change, verify that sPF again selects the primary path and falls back when its link fails. Flag recurrence if a high-cost path is selected after a fiber repair.
  4. For each approved related change, verify that route origin stays stable across peers and protocol feedback ceases. Flag recurrence if the route repeatedly returns to the protocol it came from.

Explanation

Correct Answer

A:

This control asks for the same recovery evidence (The configured level adjacencies become operational and level-specific databases are populated) and flags recurrence of the same failure (One neighbor reports only a Level 2 adjacency despite the access level being required). It targets the underlying issue, is-is level enablement differs between interface configurations, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

B:

It is valid for another service scenario but checks neighbors remain down even though interface transport and timers match. This case instead needs a gate for one neighbor reports only a level 2 adjacency despite the access level being required and evidence that the configured level adjacencies become operational and level-specific databases are populated.

C:

This gate monitors a different failure, a high-cost path is selected after a fiber repair. It would not detect the current problem: One neighbor reports only a Level 2 adjacency despite the access level being required. The appropriate check requires the configured level adjacencies become operational and level-specific databases are populated.

D:

The proposed control is tied to import and export policy lack route-origin tagging or other feedback suppression, typically observed when the route repeatedly returns to the protocol it came from. Here the target is is-is level enablement differs between interface configurations; monitor the configured level adjacencies become operational and level-specific databases are populated.

Question 153

An IS-IS link connects P routers through a redundant ring. Observed: A high-cost path is selected after a fiber repair. Which targeted remediation is most appropriate for the observed condition?

  1. Align repaired link metrics with the approved capacity and latency engineering policy.
  2. Set intended per-level IS-IS DIS priorities consistently across segment participants.
  3. Resolve optical instability and use supported SPF and LSP throttling appropriate to the domain.
  4. Reassess DIS election behavior and set compatible supported priorities and topology.

Explanation

Correct Answer

A:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—A high-cost path is selected after a fiber repair—is consistent with the remaining interface metric on the repaired circuit is artificially high. Use the specified correction, then verify: SPF again selects the primary path and falls back when its link fails. Preserve existing policy and tenant isolation.

Incorrect Answers

B:

This change belongs to a different IS-IS issue: A maintenance router unexpectedly controls pseudonode LSP generation. That issue involves dis priority and tie-break criteria were not considered in interface design. The current symptom is A high-cost path is selected after a fiber repair. It instead requires align repaired link metrics with the approved capacity and latency engineering policy.

C:

The option may be useful when repeated LSP floods overload route processors across the metro, but that is not the current evidence. Here, a high-cost path is selected after a fiber repair, indicating the remaining interface metric on the repaired circuit is artificially high. The targeted action is Align repaired link metrics with the approved capacity and latency engineering policy.

D:

This remediates is-is dis elections do not use ospf-style zero-priority ineligibility semantics, normally indicated by Pseudonode LSPs show a DIS that was administratively expected to be ineligible. It would leave the observed problem (A high-cost path is selected after a fiber repair) unresolved. Address it with align repaired link metrics with the approved capacity and latency engineering policy.

Question 154

An IS-IS link connects P routers through a redundant ring. Observed: A high-cost path is selected after a fiber repair. What evidence would validate recovery from this precise failure mode?

  1. LSP churn declines while a legitimate failover still converges promptly.
  2. Pseudonode LSP ownership stabilizes on the approved designated router.
  3. SPF again selects the primary path and falls back when its link fails.
  4. The selected DIS matches supported election rules and operational requirements.

Explanation

Correct Answer

C:

The intended result is SPF again selects the primary path and falls back when its link fails. It specifically verifies recovery from the remaining interface metric on the repaired circuit is artificially high, which produced the original symptom: A high-cost path is selected after a fiber repair. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

That observation would verify a separate fault involving an unstable interface causes repeated topology regenerations and spf scheduling. Its symptom is Repeated LSP floods overload route processors across the metro. For this case the actual issue is the remaining interface metric on the repaired circuit is artificially high, and the relevant success signal is SPF again selects the primary path and falls back when its link fails.

B:

It confirms an unrelated service correction: DIS priority and tie-break criteria were not considered in interface design. The present case reports A high-cost path is selected after a fiber repair. Its completion test is SPF again selects the primary path and falls back when its link fails.

D:

This result is useful in another case with evidence Pseudonode LSPs show a DIS that was administratively expected to be ineligible. It does not test recovery from a high-cost path is selected after a fiber repair. Check instead whether sPF again selects the primary path and falls back when its link fails.

Question 155

An IS-IS link connects P routers through a redundant ring. Observed: A high-cost path is selected after a fiber repair. What underlying protocol or service configuration problem best explains the evidence?

  1. The remaining interface metric on the repaired circuit is artificially high.
  2. DIS priority and tie-break criteria were not considered in interface design.
  3. IS-IS DIS elections do not use OSPF-style zero-priority ineligibility semantics.
  4. An unstable interface causes repeated topology regenerations and SPF scheduling.

Explanation

Correct Answer

A:

Because a high-cost path is selected after a fiber repair, the likely cause is the remaining interface metric on the repaired circuit is artificially high. It is testable: Align repaired link metrics with the approved capacity and latency engineering policy. Expected follow-up: SPF again selects the primary path and falls back when its link fails.

Incorrect Answers

B:

DIS priority and tie-break criteria were not considered in interface design. would normally be accompanied by a maintenance router unexpectedly controls pseudonode lsp generation. The observed symptom is different: A high-cost path is selected after a fiber repair. The likely cause is The remaining interface metric on the repaired circuit is artificially high.

C:

That explanation fits another condition: Pseudonode LSPs show a DIS that was administratively expected to be ineligible. The evidence here is A high-cost path is selected after a fiber repair. Its closer root cause is The remaining interface metric on the repaired circuit is artificially high.

D:

The stated cause is possible elsewhere but explains repeated lsp floods overload route processors across the metro, not a high-cost path is selected after a fiber repair. This incident is better attributed to the remaining interface metric on the repaired circuit is artificially high.

Question 156

An IS-IS link connects P routers through a redundant ring. Observed: A high-cost path is selected after a fiber repair. Which ongoing validation gate would best detect a recurrence of this problem?

  1. For each approved related change, verify that pseudonode LSP ownership stabilizes on the approved designated router. Flag recurrence if a maintenance router unexpectedly controls pseudonode LSP generation.
  2. For each approved related change, verify that lSP churn declines while a legitimate failover still converges promptly. Flag recurrence if repeated LSP floods overload route processors across the metro.
  3. For each approved related change, verify that sPF again selects the primary path and falls back when its link fails. Flag recurrence if a high-cost path is selected after a fiber repair.
  4. For each approved related change, verify that the selected DIS matches supported election rules and operational requirements. Flag recurrence if pseudonode LSPs show a DIS that was administratively expected to be ineligible.

Explanation

Correct Answer

C:

A useful regression gate tests whether sPF again selects the primary path and falls back when its link fails and alerts when a high-cost path is selected after a fiber repair. This directly checks the technical weakness: The remaining interface metric on the repaired circuit is artificially high. The gate is derived from the fictional incident and is not an independent Juniper engineer signoff.

Incorrect Answers

A:

This gate monitors a different failure, a maintenance router unexpectedly controls pseudonode lsp generation. It would not detect the current problem: A high-cost path is selected after a fiber repair. The appropriate check requires sPF again selects the primary path and falls back when its link fails.

B:

The proposed control is tied to an unstable interface causes repeated topology regenerations and spf scheduling, typically observed when repeated LSP floods overload route processors across the metro. Here the target is the remaining interface metric on the repaired circuit is artificially high; monitor sPF again selects the primary path and falls back when its link fails.

D:

It is valid for another service scenario but checks pseudonode lsps show a dis that was administratively expected to be ineligible. This case instead needs a gate for a high-cost path is selected after a fiber repair and evidence that sPF again selects the primary path and falls back when its link fails.

Question 157

A large IS-IS domain undergoes maintenance with rapidly flapping optical links. Observed: Repeated LSP floods overload route processors across the metro. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Assign unique NET system IDs and restart affected adjacencies safely.
  2. Inspect protocol database freshness and forwarding state; perform scoped recovery.
  3. Resolve optical instability and use supported SPF and LSP throttling appropriate to the domain.
  4. Agree on wide metric support across the topology before applying planned link metrics.

Explanation

Correct Answer

C:

The observed condition is Repeated LSP floods overload route processors across the metro. That indicates an unstable interface causes repeated topology regenerations and spf scheduling. Applying the proposed remedy directly changes that condition. A concrete completion check is: LSP churn declines while a legitimate failover still converges promptly.

Incorrect Answers

A:

This remediates duplicate is-is system ids cause lsp origin ambiguity, normally indicated by The LSDB shows a second device's LSP under an existing system ID. It would leave the observed problem (Repeated LSP floods overload route processors across the metro) unresolved. Address it with resolve optical instability and use supported SPF and LSP throttling appropriate to the domain.

B:

This change belongs to a different IS-IS issue: Neighbors show Up but a route is transiently absent on one PE. That issue involves spf and forwarding updates have not reconciled with a fresh lsdb after recovery. The current symptom is Repeated LSP floods overload route processors across the metro. It instead requires resolve optical instability and use supported SPF and LSP throttling appropriate to the domain.

D:

The option may be useful when paths appear with maximum legacy metric rather than engineering cost, but that is not the current evidence. Here, repeated LSP floods overload route processors across the metro, indicating an unstable interface causes repeated topology regenerations and spf scheduling. The targeted action is Resolve optical instability and use supported SPF and LSP throttling appropriate to the domain.

Question 158

A large IS-IS domain undergoes maintenance with rapidly flapping optical links. Observed: Repeated LSP floods overload route processors across the metro. After the correction, which result would most convincingly show that this fault is resolved?

  1. LSP churn declines while a legitimate failover still converges promptly.
  2. All devices agree on the LSP sequence and routing destinations become reachable.
  3. All transit routes use the intended wide metric values with stable SPF outcomes.
  4. LSP IDs are unique and topology information becomes stable.

Explanation

Correct Answer

A:

After resolve optical instability and use supported SPF and LSP throttling appropriate to the domain, inspect whether lSP churn declines while a legitimate failover still converges promptly. This closes the loop between the reported observation (Repeated LSP floods overload route processors across the metro) and the underlying issue (An unstable interface causes repeated topology regenerations and SPF scheduling).

Incorrect Answers

B:

It confirms an unrelated service correction: SPF and forwarding updates have not reconciled with a fresh LSDB after recovery. The present case reports Repeated LSP floods overload route processors across the metro. Its completion test is LSP churn declines while a legitimate failover still converges promptly.

C:

That observation would verify a separate fault involving one or more devices retain incompatible metric-style processing. Its symptom is Paths appear with maximum legacy metric rather than engineering cost. For this case the actual issue is an unstable interface causes repeated topology regenerations and spf scheduling, and the relevant success signal is LSP churn declines while a legitimate failover still converges promptly.

D:

This result is useful in another case with evidence The LSDB shows a second device's LSP under an existing system ID. It does not test recovery from repeated lsp floods overload route processors across the metro. Check instead whether lSP churn declines while a legitimate failover still converges promptly.

Question 159

A large IS-IS domain undergoes maintenance with rapidly flapping optical links. Observed: Repeated LSP floods overload route processors across the metro. Which root cause is most consistent with this symptom?

  1. An unstable interface causes repeated topology regenerations and SPF scheduling.
  2. One or more devices retain incompatible metric-style processing.
  3. SPF and forwarding updates have not reconciled with a fresh LSDB after recovery.
  4. Duplicate IS-IS system IDs cause LSP origin ambiguity.

Explanation

Correct Answer

A:

The reported evidence—Repeated LSP floods overload route processors across the metro—supports an unstable interface causes repeated topology regenerations and spf scheduling. The appropriate intervention is to resolve optical instability and use supported SPF and LSP throttling appropriate to the domain, with confirmation from lSP churn declines while a legitimate failover still converges promptly. Other causes require actual device-state verification.

Incorrect Answers

B:

The stated cause is possible elsewhere but explains paths appear with maximum legacy metric rather than engineering cost, not repeated lsp floods overload route processors across the metro. This incident is better attributed to an unstable interface causes repeated topology regenerations and spf scheduling.

C:

SPF and forwarding updates have not reconciled with a fresh LSDB after recovery. would normally be accompanied by neighbors show up but a route is transiently absent on one pe. The observed symptom is different: Repeated LSP floods overload route processors across the metro. The likely cause is An unstable interface causes repeated topology regenerations and SPF scheduling.

D:

That explanation fits another condition: The LSDB shows a second device's LSP under an existing system ID. The evidence here is Repeated LSP floods overload route processors across the metro. Its closer root cause is An unstable interface causes repeated topology regenerations and SPF scheduling.

Question 160

A large IS-IS domain undergoes maintenance with rapidly flapping optical links. Observed: Repeated LSP floods overload route processors across the metro. Which change-acceptance control is most relevant to preventing this exact failure?

  1. For each approved related change, verify that lSP IDs are unique and topology information becomes stable. Flag recurrence if the LSDB shows a second device's LSP under an existing system ID.
  2. For each approved related change, verify that all devices agree on the LSP sequence and routing destinations become reachable. Flag recurrence if neighbors show Up but a route is transiently absent on one PE.
  3. For each approved related change, verify that all transit routes use the intended wide metric values with stable SPF outcomes. Flag recurrence if paths appear with maximum legacy metric rather than engineering cost.
  4. For each approved related change, verify that lSP churn declines while a legitimate failover still converges promptly. Flag recurrence if repeated LSP floods overload route processors across the metro.

Explanation

Correct Answer

D:

The control is specific to the initial failure. It requires the result LSP churn declines while a legitimate failover still converges promptly. and treats Repeated LSP floods overload route processors across the metro. as a failure signal. The causal concern is an unstable interface causes repeated topology regenerations and spf scheduling.

Incorrect Answers

A:

It is valid for another service scenario but checks the lsdb shows a second device's lsp under an existing system id. This case instead needs a gate for repeated lsp floods overload route processors across the metro and evidence that lSP churn declines while a legitimate failover still converges promptly.

B:

This gate monitors a different failure, neighbors show up but a route is transiently absent on one pe. It would not detect the current problem: Repeated LSP floods overload route processors across the metro. The appropriate check requires lSP churn declines while a legitimate failover still converges promptly.

C:

The proposed control is tied to one or more devices retain incompatible metric-style processing, typically observed when paths appear with maximum legacy metric rather than engineering cost. Here the target is an unstable interface causes repeated topology regenerations and spf scheduling; monitor lSP churn declines while a legitimate failover still converges promptly.

Service Provider Routing and Switching, Professional (JNCIP-SP) (JN0-664) Practice Tests