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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 19

Question 180

An IS-IS wide-metric topology has parallel unequal-speed core links. Observed: Both links receive the same metric despite service quality differences. Which ongoing validation gate would best detect a recurrence of this problem?

  1. For each approved related change, verify that the shortest-path result reflects distinct link costs and operational flow validation. Flag recurrence if both links receive the same metric despite service quality differences.
  2. For each approved related change, verify that the L1 router selects a valid nearest Level 2 exit and customer traffic resumes. Flag recurrence if the device has healthy local adjacencies but does not know any Level 2 exit.
  3. 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.
  4. For each approved related change, verify that other routers install the loopback and local adjacency state remains unchanged. Flag recurrence if the loopback is missing from other routers even though link adjacencies are healthy.

Explanation

Correct Answer

A:

A useful regression gate tests whether the shortest-path result reflects distinct link costs and operational flow validation and alerts when both links receive the same metric despite service quality differences. This directly checks the technical weakness: Default metrics were left unchanged after the capacity upgrade. The gate is derived from the fictional incident and is not an independent Juniper engineer signoff.

Incorrect Answers

B:

It is valid for another service scenario but checks the device has healthy local adjacencies but does not know any level 2 exit. This case instead needs a gate for both links receive the same metric despite service quality differences and evidence that the shortest-path result reflects distinct link costs and operational flow validation.

C:

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 default metrics were left unchanged after the capacity upgrade; monitor the shortest-path result reflects distinct link costs and operational flow validation.

D:

This gate monitors a different failure, the loopback is missing from other routers even though link adjacencies are healthy. It would not detect the current problem: Both links receive the same metric despite service quality differences. The appropriate check requires the shortest-path result reflects distinct link costs and operational flow validation.

Question 181

A core route is redistributed from another protocol into IS-IS. Observed: The route repeatedly returns to the protocol it came from. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Apply strict route prefix and origin filters and prevent re-redistribution.
  2. Reassess DIS election behavior and set compatible supported priorities and topology.
  3. Align the appropriate area addresses or use Level 2 operation for interarea links.
  4. Match intended Level 1 and Level 2 circuit types on both routers.

Explanation

Correct Answer

A:

The observed condition is The route repeatedly returns to the protocol it came from. That indicates import and export policy lack route-origin tagging or other feedback suppression. Applying the proposed remedy directly changes that condition. A concrete completion check is: Route origin stays stable across peers and protocol feedback ceases.

Incorrect Answers

B:

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 (The route repeatedly returns to the protocol it came from) unresolved. Address it with apply strict route prefix and origin filters and prevent re-redistribution.

C:

This change belongs to a different IS-IS issue: Neighbors remain Down even though interface transport and timers match. That issue involves net area identifiers disagree for intended level 1 adjacency. The current symptom is The route repeatedly returns to the protocol it came from. It instead requires apply strict route prefix and origin filters and prevent re-redistribution.

D:

The option may be useful when one neighbor reports only a Level 2 adjacency despite the access level being required, but that is not the current evidence. Here, the route repeatedly returns to the protocol it came from, indicating import and export policy lack route-origin tagging or other feedback suppression. The targeted action is Apply strict route prefix and origin filters and prevent re-redistribution.

Question 182

A core route is redistributed from another protocol into IS-IS. Observed: The route repeatedly returns to the protocol it came from. After the correction, which result would most convincingly show that this fault is resolved?

  1. Route origin stays stable across peers and protocol feedback ceases.
  2. The selected DIS matches supported election rules and operational requirements.
  3. The configured level adjacencies become operational and level-specific databases are populated.
  4. Neighbor adjacency forms at the intended level and LSDB distribution is correct.

Explanation

Correct Answer

A:

After apply strict route prefix and origin filters and prevent re-redistribution, inspect whether route origin stays stable across peers and protocol feedback ceases. This closes the loop between the reported observation (The route repeatedly returns to the protocol it came from) and the underlying issue (Import and export policy lack route-origin tagging or other feedback suppression).

Incorrect Answers

B:

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 the route repeatedly returns to the protocol it came from. Check instead whether route origin stays stable across peers and protocol feedback ceases.

C:

That observation would verify a separate fault involving is-is level enablement differs between interface configurations. Its symptom is One neighbor reports only a Level 2 adjacency despite the access level being required. For this case the actual issue is import and export policy lack route-origin tagging or other feedback suppression, and the relevant success signal is Route origin stays stable across peers and protocol feedback ceases.

D:

It confirms an unrelated service correction: NET area identifiers disagree for intended Level 1 adjacency. The present case reports The route repeatedly returns to the protocol it came from. Its completion test is Route origin stays stable across peers and protocol feedback ceases.

Question 183

A core route is redistributed from another protocol into IS-IS. Observed: The route repeatedly returns to the protocol it came from. Which root cause is most consistent with this symptom?

  1. Import and export policy lack route-origin tagging or other feedback suppression.
  2. IS-IS level enablement differs between interface configurations.
  3. IS-IS DIS elections do not use OSPF-style zero-priority ineligibility semantics.
  4. NET area identifiers disagree for intended Level 1 adjacency.

Explanation

Correct Answer

A:

The reported evidence—The route repeatedly returns to the protocol it came from—supports import and export policy lack route-origin tagging or other feedback suppression. The appropriate intervention is to apply strict route prefix and origin filters and prevent re-redistribution, with confirmation from route origin stays stable across peers and protocol feedback ceases. Other causes require actual device-state verification.

Incorrect Answers

B:

The stated cause is possible elsewhere but explains one neighbor reports only a level 2 adjacency despite the access level being required, not the route repeatedly returns to the protocol it came from. This incident is better attributed to import and export policy lack route-origin tagging or other feedback suppression.

C:

That explanation fits another condition: Pseudonode LSPs show a DIS that was administratively expected to be ineligible. The evidence here is The route repeatedly returns to the protocol it came from. Its closer root cause is Import and export policy lack route-origin tagging or other feedback suppression.

D:

NET area identifiers disagree for intended Level 1 adjacency. would normally be accompanied by neighbors remain down even though interface transport and timers match. The observed symptom is different: The route repeatedly returns to the protocol it came from. The likely cause is Import and export policy lack route-origin tagging or other feedback suppression.

Question 184

A core route is redistributed from another protocol into IS-IS. Observed: The route repeatedly returns to the protocol it came from. Which change-acceptance control is most relevant to preventing this exact failure?

  1. 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.
  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 route origin stays stable across peers and protocol feedback ceases. Flag recurrence if the route repeatedly returns to the protocol it came from.
  4. 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.

Explanation

Correct Answer

C:

The control is specific to the initial failure. It requires the result Route origin stays stable across peers and protocol feedback ceases. and treats The route repeatedly returns to the protocol it came from. as a failure signal. The causal concern is import and export policy lack route-origin tagging or other feedback suppression.

Incorrect Answers

A:

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 the route repeatedly returns to the protocol it came from and evidence that route origin stays stable across peers and protocol feedback ceases.

B:

This gate monitors a different failure, neighbors remain down even though interface transport and timers match. It would not detect the current problem: The route repeatedly returns to the protocol it came from. The appropriate check requires route origin stays stable across peers and protocol feedback ceases.

D:

The proposed control is tied to is-is level enablement differs between interface configurations, typically observed when one neighbor reports only a Level 2 adjacency despite the access level being required. Here the target is import and export policy lack route-origin tagging or other feedback suppression; monitor route origin stays stable across peers and protocol feedback ceases.

Question 185

A Level 2 IS-IS router is connected by a broadcast fabric with several candidates. Observed: Pseudonode LSPs show a DIS that was administratively expected to be ineligible. What should the routing engineer change first to address this particular symptom?

  1. Set intended per-level IS-IS DIS priorities consistently across segment participants.
  2. Inspect protocol database freshness and forwarding state; perform scoped recovery.
  3. Reassess DIS election behavior and set compatible supported priorities and topology.
  4. Align repaired link metrics with the approved capacity and latency engineering policy.

Explanation

Correct Answer

C:

The decisive evidence is that Pseudonode LSPs show a DIS that was administratively expected to be ineligible. This follows from is-is dis elections do not use ospf-style zero-priority ineligibility semantics. The focused remedy is to reassess DIS election behavior and set compatible supported priorities and topology. Confirm improvement when the selected DIS matches supported election rules and operational requirements. Validate on an approved lab or change window before touching production.

Incorrect Answers

A:

The option may be useful when a maintenance router unexpectedly controls pseudonode LSP generation, but that is not the current evidence. Here, pseudonode LSPs show a DIS that was administratively expected to be ineligible, indicating is-is dis elections do not use ospf-style zero-priority ineligibility semantics. The targeted action is Reassess DIS election behavior and set compatible supported priorities and topology.

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 Pseudonode LSPs show a DIS that was administratively expected to be ineligible. It instead requires reassess DIS election behavior and set compatible supported priorities and topology.

D:

This remediates the remaining interface metric on the repaired circuit is artificially high, normally indicated by A high-cost path is selected after a fiber repair. It would leave the observed problem (Pseudonode LSPs show a DIS that was administratively expected to be ineligible) unresolved. Address it with reassess DIS election behavior and set compatible supported priorities and topology.

Question 186

A Level 2 IS-IS router is connected by a broadcast fabric with several candidates. Observed: Pseudonode LSPs show a DIS that was administratively expected to be ineligible. 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 selected DIS matches supported election rules and operational requirements.
  3. All devices agree on the LSP sequence and routing destinations become reachable.
  4. Pseudonode LSP ownership stabilizes on the approved designated router.

Explanation

Correct Answer

B:

This acceptance criterion tests the actual fault. The source evidence was Pseudonode LSPs show a DIS that was administratively expected to be ineligible. The correction addresses is-is dis elections do not use ospf-style zero-priority ineligibility semantics; success requires the selected DIS matches supported election rules and operational requirements.

Incorrect Answers

A:

This result is useful in another case with evidence A high-cost path is selected after a fiber repair. It does not test recovery from pseudonode lsps show a dis that was administratively expected to be ineligible. Check instead whether the selected DIS matches supported election rules and operational requirements.

C:

It confirms an unrelated service correction: SPF and forwarding updates have not reconciled with a fresh LSDB after recovery. The present case reports Pseudonode LSPs show a DIS that was administratively expected to be ineligible. Its completion test is The selected DIS matches supported election rules and operational requirements.

D:

That observation would verify a separate fault involving dis priority and tie-break criteria were not considered in interface design. Its symptom is A maintenance router unexpectedly controls pseudonode LSP generation. For this case the actual issue is is-is dis elections do not use ospf-style zero-priority ineligibility semantics, and the relevant success signal is The selected DIS matches supported election rules and operational requirements.

Question 187

A Level 2 IS-IS router is connected by a broadcast fabric with several candidates. Observed: Pseudonode LSPs show a DIS that was administratively expected to be ineligible. What is the most likely source of the observed routing or service failure?

  1. The remaining interface metric on the repaired circuit is artificially high.
  2. IS-IS DIS elections do not use OSPF-style zero-priority ineligibility semantics.
  3. SPF and forwarding updates have not reconciled with a fresh LSDB after recovery.
  4. DIS priority and tie-break criteria were not considered in interface design.

Explanation

Correct Answer

B:

This explanation is the closest match to the observed symptom: Pseudonode LSPs show a DIS that was administratively expected to be ineligible. The specified root issue is IS-IS DIS elections do not use OSPF-style zero-priority ineligibility semantics. Repair it through reassess DIS election behavior and set compatible supported priorities and topology, then check the selected DIS matches supported election rules and operational requirements.

Incorrect Answers

A:

That explanation fits another condition: A high-cost path is selected after a fiber repair. The evidence here is Pseudonode LSPs show a DIS that was administratively expected to be ineligible. Its closer root cause is IS-IS DIS elections do not use OSPF-style zero-priority ineligibility semantics.

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: Pseudonode LSPs show a DIS that was administratively expected to be ineligible. The likely cause is IS-IS DIS elections do not use OSPF-style zero-priority ineligibility semantics.

D:

The stated cause is possible elsewhere but explains a maintenance router unexpectedly controls pseudonode lsp generation, not pseudonode lsps show a dis that was administratively expected to be ineligible. This incident is better attributed to is-is dis elections do not use ospf-style zero-priority ineligibility semantics.

Question 188

A Level 2 IS-IS router is connected by a broadcast fabric with several candidates. Observed: Pseudonode LSPs show a DIS that was administratively expected to be ineligible. What operational check best guards against this problem returning?

  1. 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.
  2. 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.
  3. 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.
  4. 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.

Explanation

Correct Answer

A:

This control asks for the same recovery evidence (The selected DIS matches supported election rules and operational requirements) and flags recurrence of the same failure (Pseudonode LSPs show a DIS that was administratively expected to be ineligible). It targets the underlying issue, is-is dis elections do not use ospf-style zero-priority ineligibility semantics, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

B:

The proposed control is tied to dis priority and tie-break criteria were not considered in interface design, typically observed when a maintenance router unexpectedly controls pseudonode LSP generation. Here the target is is-is dis elections do not use ospf-style zero-priority ineligibility semantics; monitor the selected DIS matches supported election rules and operational requirements.

C:

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: Pseudonode LSPs show a DIS that was administratively expected to be ineligible. The appropriate check requires the selected DIS matches supported election rules and operational requirements.

D:

It is valid for another service scenario but checks a high-cost path is selected after a fiber repair. This case instead needs a gate for pseudonode lsps show a dis that was administratively expected to be ineligible and evidence that the selected DIS matches supported election rules and operational requirements.

Question 189

An IS-IS core swaps a routing engine after unplanned power loss. Observed: Neighbors show Up but a route is transiently absent on one PE. Which targeted remediation is most appropriate for the observed condition?

  1. Inspect protocol database freshness and forwarding state; perform scoped recovery.
  2. Agree on wide metric support across the topology before applying planned link metrics.
  3. Resolve optical instability and use supported SPF and LSP throttling appropriate to the domain.
  4. Stage matched IS-IS authentication keys and supported algorithm configuration.

Explanation

Correct Answer

A:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—Neighbors show Up but a route is transiently absent on one PE—is consistent with spf and forwarding updates have not reconciled with a fresh lsdb after recovery. Use the specified correction, then verify: All devices agree on the LSP sequence and routing destinations become reachable. Preserve existing policy and tenant isolation.

Incorrect Answers

B:

This remediates one or more devices retain incompatible metric-style processing, normally indicated by Paths appear with maximum legacy metric rather than engineering cost. It would leave the observed problem (Neighbors show Up but a route is transiently absent on one PE) unresolved. Address it with inspect protocol database freshness and forwarding state; perform scoped recovery.

C:

This change belongs to a different IS-IS issue: Repeated LSP floods overload route processors across the metro. That issue involves an unstable interface causes repeated topology regenerations and spf scheduling. The current symptom is Neighbors show Up but a route is transiently absent on one PE. It instead requires inspect protocol database freshness and forwarding state; perform scoped recovery.

D:

The option may be useful when adjacencies flap only when authentication is enabled, but that is not the current evidence. Here, neighbors show Up but a route is transiently absent on one PE, indicating spf and forwarding updates have not reconciled with a fresh lsdb after recovery. The targeted action is Inspect protocol database freshness and forwarding state; perform scoped recovery.

Question 190

An IS-IS core swaps a routing engine after unplanned power loss. Observed: Neighbors show Up but a route is transiently absent on one PE. What evidence would validate recovery from this precise failure mode?

  1. LSP churn declines while a legitimate failover still converges promptly.
  2. Neighbors stay up and authentication errors stop in protocol logs.
  3. All devices agree on the LSP sequence and routing destinations become reachable.
  4. All transit routes use the intended wide metric values with stable SPF outcomes.

Explanation

Correct Answer

C:

The intended result is All devices agree on the LSP sequence and routing destinations become reachable. It specifically verifies recovery from spf and forwarding updates have not reconciled with a fresh lsdb after recovery, which produced the original symptom: Neighbors show Up but a route is transiently absent on one PE. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

It confirms an unrelated service correction: An unstable interface causes repeated topology regenerations and SPF scheduling. The present case reports Neighbors show Up but a route is transiently absent on one PE. Its completion test is All devices agree on the LSP sequence and routing destinations become reachable.

B:

That observation would verify a separate fault involving authentication method and key match do not agree between adjacent peers. Its symptom is Adjacencies flap only when authentication is enabled. For this case the actual issue is spf and forwarding updates have not reconciled with a fresh lsdb after recovery, and the relevant success signal is All devices agree on the LSP sequence and routing destinations become reachable.

D:

This result is useful in another case with evidence Paths appear with maximum legacy metric rather than engineering cost. It does not test recovery from neighbors show up but a route is transiently absent on one pe. Check instead whether all devices agree on the LSP sequence and routing destinations become reachable.

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