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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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"Service Provider Routing and Switching, Professional (JNCIP-SP) Exam", also known as JN0-664 exam, is a Juniper certification exam.

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Juniper JN0-664 Practice Test 12

Question 110

An OSPF customer edge announces a route into an area with multiple ABRs. Observed: Two ABRs forward the same prefix via different areas and traffic becomes asymmetrical. After the correction, which result would most convincingly show that this fault is resolved?

  1. Neighbors reach Full state and exchange the same database summaries.
  2. Customer default is present only under the permitted upstream condition.
  3. IPv6 routes are installed with valid OSPFv3 next hops independent of OSPFv2.
  4. Both directions use stable documented paths without unexpected duplicate interarea reachability.

Explanation

Correct Answer

D:

After remove the unintended interarea leak and verify area summaries and route preferences, inspect whether both directions use stable documented paths without unexpected duplicate interarea reachability. This closes the loop between the reported observation (Two ABRs forward the same prefix via different areas and traffic becomes asymmetrical) and the underlying issue (An interarea route leaking policy introduced competing origin and preference paths).

Incorrect Answers

A:

This result is useful in another case with evidence The adjacency stays in ExStart after a router replacement with a different interface MTU. It does not test recovery from two abrs forward the same prefix via different areas and traffic becomes asymmetrical. Check instead whether both directions use stable documented paths without unexpected duplicate interarea reachability.

B:

That observation would verify a separate fault involving conditional default origination depends on a qualifying default route that is absent. Its symptom is Customer routing devices receive no default after the provider loses upstream connectivity. For this case the actual issue is an interarea route leaking policy introduced competing origin and preference paths, and the relevant success signal is Both directions use stable documented paths without unexpected duplicate interarea reachability.

C:

It confirms an unrelated service correction: OSPFv3 protocol adjacency and IPv6 address-family enablement were not implemented. The present case reports Two ABRs forward the same prefix via different areas and traffic becomes asymmetrical. Its completion test is Both directions use stable documented paths without unexpected duplicate interarea reachability.

Question 111

An OSPF customer edge announces a route into an area with multiple ABRs. Observed: Two ABRs forward the same prefix via different areas and traffic becomes asymmetrical. Which root cause is most consistent with this symptom?

  1. A database-description MTU mismatch prevents OSPF database synchronization.
  2. An interarea route leaking policy introduced competing origin and preference paths.
  3. OSPFv3 protocol adjacency and IPv6 address-family enablement were not implemented.
  4. Conditional default origination depends on a qualifying default route that is absent.

Explanation

Correct Answer

B:

The reported evidence—Two ABRs forward the same prefix via different areas and traffic becomes asymmetrical—supports an interarea route leaking policy introduced competing origin and preference paths. The appropriate intervention is to remove the unintended interarea leak and verify area summaries and route preferences, with confirmation from both directions use stable documented paths without unexpected duplicate interarea reachability. Other causes require actual device-state verification.

Incorrect Answers

A:

That explanation fits another condition: The adjacency stays in ExStart after a router replacement with a different interface MTU. The evidence here is Two ABRs forward the same prefix via different areas and traffic becomes asymmetrical. Its closer root cause is An interarea route leaking policy introduced competing origin and preference paths.

C:

OSPFv3 protocol adjacency and IPv6 address-family enablement were not implemented. would normally be accompanied by ipv6 prefixes never appear in the ospf route table although ipv4 ospf neighbors are healthy. The observed symptom is different: Two ABRs forward the same prefix via different areas and traffic becomes asymmetrical. The likely cause is An interarea route leaking policy introduced competing origin and preference paths.

D:

The stated cause is possible elsewhere but explains customer routing devices receive no default after the provider loses upstream connectivity, not two abrs forward the same prefix via different areas and traffic becomes asymmetrical. This incident is better attributed to an interarea route leaking policy introduced competing origin and preference paths.

Question 112

An OSPF customer edge announces a route into an area with multiple ABRs. Observed: Two ABRs forward the same prefix via different areas and traffic becomes asymmetrical. Which change-acceptance control is most relevant to preventing this exact failure?

  1. For each approved related change, verify that both directions use stable documented paths without unexpected duplicate interarea reachability. Flag recurrence if two ABRs forward the same prefix via different areas and traffic becomes asymmetrical.
  2. For each approved related change, verify that iPv6 routes are installed with valid OSPFv3 next hops independent of OSPFv2. Flag recurrence if iPv6 prefixes never appear in the OSPF route table although IPv4 OSPF neighbors are healthy.
  3. For each approved related change, verify that neighbors reach Full state and exchange the same database summaries. Flag recurrence if the adjacency stays in ExStart after a router replacement with a different interface MTU.
  4. For each approved related change, verify that customer default is present only under the permitted upstream condition. Flag recurrence if customer routing devices receive no default after the provider loses upstream connectivity.

Explanation

Correct Answer

A:

The control is specific to the initial failure. It requires the result Both directions use stable documented paths without unexpected duplicate interarea reachability. and treats Two ABRs forward the same prefix via different areas and traffic becomes asymmetrical. as a failure signal. The causal concern is an interarea route leaking policy introduced competing origin and preference paths.

Incorrect Answers

B:

This gate monitors a different failure, ipv6 prefixes never appear in the ospf route table although ipv4 ospf neighbors are healthy. It would not detect the current problem: Two ABRs forward the same prefix via different areas and traffic becomes asymmetrical. The appropriate check requires both directions use stable documented paths without unexpected duplicate interarea reachability.

C:

It is valid for another service scenario but checks the adjacency stays in exstart after a router replacement with a different interface mtu. This case instead needs a gate for two abrs forward the same prefix via different areas and traffic becomes asymmetrical and evidence that both directions use stable documented paths without unexpected duplicate interarea reachability.

D:

The proposed control is tied to conditional default origination depends on a qualifying default route that is absent, typically observed when customer routing devices receive no default after the provider loses upstream connectivity. Here the target is an interarea route leaking policy introduced competing origin and preference paths; monitor both directions use stable documented paths without unexpected duplicate interarea reachability.

Question 113

An IS-IS Level 1 metro router loses remote backbone reachability. Observed: The device has healthy local adjacencies but does not know any Level 2 exit. What should the routing engineer change first to address this particular symptom?

  1. Apply deliberate per-interface wide metrics based on the approved TE design.
  2. Align the appropriate area addresses or use Level 2 operation for interarea links.
  3. Add the loopback to the intended IS-IS level without requiring a loopback neighbor.
  4. Restore a legitimate L1/L2 border adjacency and verify attached-bit default propagation.

Explanation

Correct Answer

D:

The decisive evidence is that The device has healthy local adjacencies but does not know any Level 2 exit. This follows from no attached level 1/level 2 router is advertising the appropriate default path. The focused remedy is to restore a legitimate L1/L2 border adjacency and verify attached-bit default propagation. Confirm improvement when the L1 router selects a valid nearest Level 2 exit and customer traffic resumes. Validate on an approved lab or change window before touching production.

Incorrect Answers

A:

This remediates default metrics were left unchanged after the capacity upgrade, normally indicated by Both links receive the same metric despite service quality differences. It would leave the observed problem (The device has healthy local adjacencies but does not know any Level 2 exit) unresolved. Address it with restore a legitimate L1/L2 border adjacency and verify attached-bit default propagation.

B:

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 device has healthy local adjacencies but does not know any Level 2 exit. It instead requires restore a legitimate L1/L2 border adjacency and verify attached-bit default propagation.

C:

The option may be useful when the loopback is missing from other routers even though link adjacencies are healthy, but that is not the current evidence. Here, the device has healthy local adjacencies but does not know any Level 2 exit, indicating no attached level 1/level 2 router is advertising the appropriate default path. The targeted action is Restore a legitimate L1/L2 border adjacency and verify attached-bit default propagation.

Question 114

An IS-IS Level 1 metro router loses remote backbone reachability. Observed: The device has healthy local adjacencies but does not know any Level 2 exit. Which acceptance observation best confirms that the proposed change worked?

  1. Other routers install the loopback and local adjacency state remains unchanged.
  2. The L1 router selects a valid nearest Level 2 exit and customer traffic resumes.
  3. The shortest-path result reflects distinct link costs and operational flow validation.
  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 The device has healthy local adjacencies but does not know any Level 2 exit. The correction addresses no attached level 1/level 2 router is advertising the appropriate default path; success requires the L1 router selects a valid nearest Level 2 exit and customer traffic resumes.

Incorrect Answers

A:

That observation would verify a separate fault involving the intended passive loopback prefix was not advertised in is-is. Its symptom is The loopback is missing from other routers even though link adjacencies are healthy. For this case the actual issue is no attached level 1/level 2 router is advertising the appropriate default path, and the relevant success signal is The L1 router selects a valid nearest Level 2 exit and customer traffic resumes.

C:

This result is useful in another case with evidence Both links receive the same metric despite service quality differences. It does not test recovery from the device has healthy local adjacencies but does not know any level 2 exit. Check instead whether the L1 router selects a valid nearest Level 2 exit and customer traffic resumes.

D:

It confirms an unrelated service correction: NET area identifiers disagree for intended Level 1 adjacency. The present case reports The device has healthy local adjacencies but does not know any Level 2 exit. Its completion test is The L1 router selects a valid nearest Level 2 exit and customer traffic resumes.

Question 115

An IS-IS Level 1 metro router loses remote backbone reachability. Observed: The device has healthy local adjacencies but does not know any Level 2 exit. What is the most likely source of the observed routing or service failure?

  1. The intended passive loopback prefix was not advertised in IS-IS.
  2. NET area identifiers disagree for intended Level 1 adjacency.
  3. Default metrics were left unchanged after the capacity upgrade.
  4. No attached Level 1/Level 2 router is advertising the appropriate default path.

Explanation

Correct Answer

D:

This explanation is the closest match to the observed symptom: The device has healthy local adjacencies but does not know any Level 2 exit. The specified root issue is No attached Level 1/Level 2 router is advertising the appropriate default path. Repair it through restore a legitimate L1/L2 border adjacency and verify attached-bit default propagation, then check the L1 router selects a valid nearest Level 2 exit and customer traffic resumes.

Incorrect Answers

A:

The stated cause is possible elsewhere but explains the loopback is missing from other routers even though link adjacencies are healthy, not the device has healthy local adjacencies but does not know any level 2 exit. This incident is better attributed to no attached level 1/level 2 router is advertising the appropriate default path.

B:

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 device has healthy local adjacencies but does not know any Level 2 exit. The likely cause is No attached Level 1/Level 2 router is advertising the appropriate default path.

C:

That explanation fits another condition: Both links receive the same metric despite service quality differences. The evidence here is The device has healthy local adjacencies but does not know any Level 2 exit. Its closer root cause is No attached Level 1/Level 2 router is advertising the appropriate default path.

Question 116

An IS-IS Level 1 metro router loses remote backbone reachability. Observed: The device has healthy local adjacencies but does not know any Level 2 exit. What operational check best guards against this problem returning?

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

Explanation

Correct Answer

C:

This control asks for the same recovery evidence (The L1 router selects a valid nearest Level 2 exit and customer traffic resumes) and flags recurrence of the same failure (The device has healthy local adjacencies but does not know any Level 2 exit). It targets the underlying issue, no attached level 1/level 2 router is advertising the appropriate default path, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

A:

This gate monitors a different failure, neighbors remain down even though interface transport and timers match. It would not detect the current problem: The device has healthy local adjacencies but does not know any Level 2 exit. The appropriate check requires the L1 router selects a valid nearest Level 2 exit and customer traffic resumes.

B:

The proposed control is tied to the intended passive loopback prefix was not advertised in is-is, typically observed when the loopback is missing from other routers even though link adjacencies are healthy. Here the target is no attached level 1/level 2 router is advertising the appropriate default path; monitor the L1 router selects a valid nearest Level 2 exit and customer traffic resumes.

D:

It is valid for another service scenario but checks both links receive the same metric despite service quality differences. This case instead needs a gate for the device has healthy local adjacencies but does not know any level 2 exit and evidence that the L1 router selects a valid nearest Level 2 exit and customer traffic resumes.

Question 117

A new IS-IS site is added to an existing common core. Observed: Neighbors remain Down even though interface transport and timers match. Which targeted remediation is most appropriate for the observed condition?

  1. Apply strict route prefix and origin filters and prevent re-redistribution.
  2. Match intended Level 1 and Level 2 circuit types on both routers.
  3. Align the appropriate area addresses or use Level 2 operation for interarea links.
  4. Set intended per-level IS-IS DIS priorities consistently across segment participants.

Explanation

Correct Answer

C:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—Neighbors remain Down even though interface transport and timers match—is consistent with net area identifiers disagree for intended level 1 adjacency. Use the specified correction, then verify: Neighbor adjacency forms at the intended level and LSDB distribution is correct. Preserve existing policy and tenant isolation.

Incorrect Answers

A:

This change belongs to a different IS-IS issue: The route repeatedly returns to the protocol it came from. That issue involves import and export policy lack route-origin tagging or other feedback suppression. The current symptom is Neighbors remain Down even though interface transport and timers match. It instead requires align the appropriate area addresses or use Level 2 operation for interarea links.

B:

This remediates is-is level enablement differs between interface configurations, normally indicated by One neighbor reports only a Level 2 adjacency despite the access level being required. It would leave the observed problem (Neighbors remain Down even though interface transport and timers match) unresolved. Address it with align the appropriate area addresses or use Level 2 operation for interarea links.

D:

The option may be useful when a maintenance router unexpectedly controls pseudonode LSP generation, but that is not the current evidence. Here, neighbors remain Down even though interface transport and timers match, indicating net area identifiers disagree for intended level 1 adjacency. The targeted action is Align the appropriate area addresses or use Level 2 operation for interarea links.

Question 118

A new IS-IS site is added to an existing common core. Observed: Neighbors remain Down even though interface transport and timers match. What evidence would validate recovery from this precise failure mode?

  1. Route origin stays stable across peers and protocol feedback ceases.
  2. Neighbor adjacency forms at the intended level and LSDB distribution is correct.
  3. Pseudonode LSP ownership stabilizes on the approved designated router.
  4. The configured level adjacencies become operational and level-specific databases are populated.

Explanation

Correct Answer

B:

The intended result is Neighbor adjacency forms at the intended level and LSDB distribution is correct. It specifically verifies recovery from net area identifiers disagree for intended level 1 adjacency, which produced the original symptom: Neighbors remain Down even though interface transport and timers match. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

It confirms an unrelated service correction: Import and export policy lack route-origin tagging or other feedback suppression. The present case reports Neighbors remain Down even though interface transport and timers match. Its completion test is Neighbor adjacency forms at the intended level and LSDB distribution is correct.

C:

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 net area identifiers disagree for intended level 1 adjacency, and the relevant success signal is Neighbor adjacency forms at the intended level and LSDB distribution is correct.

D:

This result is useful in another case with evidence One neighbor reports only a Level 2 adjacency despite the access level being required. It does not test recovery from neighbors remain down even though interface transport and timers match. Check instead whether neighbor adjacency forms at the intended level and LSDB distribution is correct.

Question 119

A new IS-IS site is added to an existing common core. Observed: Neighbors remain Down even though interface transport and timers match. What underlying protocol or service configuration problem best explains the evidence?

  1. NET area identifiers disagree for intended Level 1 adjacency.
  2. Import and export policy lack route-origin tagging or other feedback suppression.
  3. IS-IS level enablement differs between interface configurations.
  4. DIS priority and tie-break criteria were not considered in interface design.

Explanation

Correct Answer

A:

Because neighbors remain Down even though interface transport and timers match, the likely cause is net area identifiers disagree for intended level 1 adjacency. It is testable: Align the appropriate area addresses or use Level 2 operation for interarea links. Expected follow-up: Neighbor adjacency forms at the intended level and LSDB distribution is correct.

Incorrect Answers

B:

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

C:

That explanation fits another condition: One neighbor reports only a Level 2 adjacency despite the access level being required. The evidence here is Neighbors remain Down even though interface transport and timers match. Its closer root cause is NET area identifiers disagree for intended Level 1 adjacency.

D:

The stated cause is possible elsewhere but explains a maintenance router unexpectedly controls pseudonode lsp generation, not neighbors remain down even though interface transport and timers match. This incident is better attributed to net area identifiers disagree for intended level 1 adjacency.

Question 120

A new IS-IS site is added to an existing common core. Observed: Neighbors remain Down even though interface transport and timers match. Which ongoing validation gate would best detect a recurrence of this problem?

  1. 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.
  2. 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.
  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 pseudonode LSP ownership stabilizes on the approved designated router. Flag recurrence if a maintenance router unexpectedly controls pseudonode LSP generation.

Explanation

Correct Answer

A:

A useful regression gate tests whether neighbor adjacency forms at the intended level and LSDB distribution is correct and alerts when neighbors remain Down even though interface transport and timers match. This directly checks the technical weakness: NET area identifiers disagree for intended Level 1 adjacency. 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 one neighbor reports only a level 2 adjacency despite the access level being required. This case instead needs a gate for neighbors remain down even though interface transport and timers match and evidence that neighbor adjacency forms at the intended level and LSDB distribution is correct.

C:

This gate monitors a different failure, the route repeatedly returns to the protocol it came from. It would not detect the current problem: Neighbors remain Down even though interface transport and timers match. The appropriate check requires neighbor adjacency forms at the intended level and LSDB distribution is correct.

D:

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 net area identifiers disagree for intended level 1 adjacency; monitor neighbor adjacency forms at the intended level and LSDB distribution is correct.

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