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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 4

Question 30

An ASBR redistributes static test networks into OSPF. Observed: A remote router prefers an external route over the expected alternative only after a cost change. Which acceptance observation best confirms that the proposed change worked?

  1. The LSDB converges to matching current LSA instances and neighbors remain Full.
  2. IPv6 routes are installed with valid OSPFv3 next hops independent of OSPFv2.
  3. Summaries appear with consistent area origin and the transit maintains Full neighbor state.
  4. Remote best-path selection changes according to the documented E1 or E2 metric behavior.

Explanation

Correct Answer

D:

This acceptance criterion tests the actual fault. The source evidence was A remote router prefers an external route over the expected alternative only after a cost change. The correction addresses type-1 and type-2 external metric semantics were treated as interchangeable; success requires remote best-path selection changes according to the documented E1 or E2 metric behavior.

Incorrect Answers

A:

This result is useful in another case with evidence Several neighbors repeatedly exchange database descriptions without completing synchronization. It does not test recovery from a remote router prefers an external route over the expected alternative only after a cost change. Check instead whether remote best-path selection changes according to the documented E1 or E2 metric behavior.

B:

It confirms an unrelated service correction: OSPFv3 protocol adjacency and IPv6 address-family enablement were not implemented. The present case reports A remote router prefers an external route over the expected alternative only after a cost change. Its completion test is Remote best-path selection changes according to the documented E1 or E2 metric behavior.

C:

That observation would verify a separate fault involving the device is not a valid abr with an area 0 logical path. Its symptom is Summaries from area 2 fail to propagate even though the transit neighbor is operational. For this case the actual issue is type-1 and type-2 external metric semantics were treated as interchangeable, and the relevant success signal is Remote best-path selection changes according to the documented E1 or E2 metric behavior.

Question 31

An ASBR redistributes static test networks into OSPF. Observed: A remote router prefers an external route over the expected alternative only after a cost change. What is the most likely source of the observed routing or service failure?

  1. Type-1 and type-2 external metric semantics were treated as interchangeable.
  2. OSPFv3 protocol adjacency and IPv6 address-family enablement were not implemented.
  3. A stale LSDB instance and LSA sequence interaction are preventing clean convergence.
  4. The device is not a valid ABR with an area 0 logical path.

Explanation

Correct Answer

A:

This explanation is the closest match to the observed symptom: A remote router prefers an external route over the expected alternative only after a cost change. The specified root issue is Type-1 and type-2 external metric semantics were treated as interchangeable. Repair it through use the intended external metric type and verify the internal cost contribution to selection, then check remote best-path selection changes according to the documented E1 or E2 metric behavior.

Incorrect Answers

B:

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: A remote router prefers an external route over the expected alternative only after a cost change. The likely cause is Type-1 and type-2 external metric semantics were treated as interchangeable.

C:

That explanation fits another condition: Several neighbors repeatedly exchange database descriptions without completing synchronization. The evidence here is A remote router prefers an external route over the expected alternative only after a cost change. Its closer root cause is Type-1 and type-2 external metric semantics were treated as interchangeable.

D:

The stated cause is possible elsewhere but explains summaries from area 2 fail to propagate even though the transit neighbor is operational, not a remote router prefers an external route over the expected alternative only after a cost change. This incident is better attributed to type-1 and type-2 external metric semantics were treated as interchangeable.

Question 32

An ASBR redistributes static test networks into OSPF. Observed: A remote router prefers an external route over the expected alternative only after a cost change. What operational check best guards against this problem returning?

  1. For each approved related change, verify that the LSDB converges to matching current LSA instances and neighbors remain Full. Flag recurrence if several neighbors repeatedly exchange database descriptions without completing synchronization.
  2. For each approved related change, verify that summaries appear with consistent area origin and the transit maintains Full neighbor state. Flag recurrence if summaries from area 2 fail to propagate even though the transit neighbor is operational.
  3. For each approved related change, verify that remote best-path selection changes according to the documented E1 or E2 metric behavior. Flag recurrence if a remote router prefers an external route over the expected alternative only after a cost change.
  4. 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.

Explanation

Correct Answer

C:

This control asks for the same recovery evidence (Remote best-path selection changes according to the documented E1 or E2 metric behavior) and flags recurrence of the same failure (A remote router prefers an external route over the expected alternative only after a cost change). It targets the underlying issue, type-1 and type-2 external metric semantics were treated as interchangeable, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

A:

It is valid for another service scenario but checks several neighbors repeatedly exchange database descriptions without completing synchronization. This case instead needs a gate for a remote router prefers an external route over the expected alternative only after a cost change and evidence that remote best-path selection changes according to the documented E1 or E2 metric behavior.

B:

The proposed control is tied to the device is not a valid abr with an area 0 logical path, typically observed when summaries from area 2 fail to propagate even though the transit neighbor is operational. Here the target is type-1 and type-2 external metric semantics were treated as interchangeable; monitor remote best-path selection changes according to the documented E1 or E2 metric behavior.

D:

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: A remote router prefers an external route over the expected alternative only after a cost change. The appropriate check requires remote best-path selection changes according to the documented E1 or E2 metric behavior.

Question 33

A remote POP is migrating OSPFv2 to IPv6 routing. Observed: IPv6 prefixes never appear in the OSPF route table although IPv4 OSPF neighbors are healthy. Which targeted remediation is most appropriate for the observed condition?

  1. Establish OSPFv3 neighbor formation and advertise intended IPv6 prefixes on supported interfaces.
  2. Restore valid upstream default reachability or explicitly define approved conditional origination.
  3. Verify matching OSPF interface network types and the proper neighbor-formation requirements.
  4. Restore intentional primary and backup OSPF path costs and verify both directions.

Explanation

Correct Answer

A:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—IPv6 prefixes never appear in the OSPF route table although IPv4 OSPF neighbors are healthy—is consistent with ospfv3 protocol adjacency and ipv6 address-family enablement were not implemented. Use the specified correction, then verify: IPv6 routes are installed with valid OSPFv3 next hops independent of OSPFv2. Preserve existing policy and tenant isolation.

Incorrect Answers

B:

This remediates conditional default origination depends on a qualifying default route that is absent, normally indicated by Customer routing devices receive no default after the provider loses upstream connectivity. It would leave the observed problem (IPv6 prefixes never appear in the OSPF route table although IPv4 OSPF neighbors are healthy) unresolved. Address it with establish OSPFv3 neighbor formation and advertise intended IPv6 prefixes on supported interfaces.

C:

The option may be useful when the interface stays in 2-Way state although the operator expects a Full relationship, but that is not the current evidence. Here, iPv6 prefixes never appear in the OSPF route table although IPv4 OSPF neighbors are healthy, indicating ospfv3 protocol adjacency and ipv6 address-family enablement were not implemented. The targeted action is Establish OSPFv3 neighbor formation and advertise intended IPv6 prefixes on supported interfaces.

D:

This change belongs to a different OSPF issue: Backup traffic activates before the primary fiber has failed. That issue involves the backup interface cost was inadvertently made lower during a maintenance template change. The current symptom is IPv6 prefixes never appear in the OSPF route table although IPv4 OSPF neighbors are healthy. It instead requires establish OSPFv3 neighbor formation and advertise intended IPv6 prefixes on supported interfaces.

Question 34

A remote POP is migrating OSPFv2 to IPv6 routing. Observed: IPv6 prefixes never appear in the OSPF route table although IPv4 OSPF neighbors are healthy. What evidence would validate recovery from this precise failure mode?

  1. Adjacency reaches the state appropriate for the installed point-to-point design.
  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. Normal traffic favors the primary and failover selects backup only when intended.

Explanation

Correct Answer

C:

The intended result is IPv6 routes are installed with valid OSPFv3 next hops independent of OSPFv2. It specifically verifies recovery from ospfv3 protocol adjacency and ipv6 address-family enablement were not implemented, which produced the original symptom: IPv6 prefixes never appear in the OSPF route table although IPv4 OSPF neighbors are healthy. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

That observation would verify a separate fault involving link network type and adjacency expectations do not match the actual segment design. Its symptom is The interface stays in 2-Way state although the operator expects a Full relationship. For this case the actual issue is ospfv3 protocol adjacency and ipv6 address-family enablement were not implemented, and the relevant success signal is IPv6 routes are installed with valid OSPFv3 next hops independent of OSPFv2.

B:

This result is useful in another case with evidence Customer routing devices receive no default after the provider loses upstream connectivity. It does not test recovery from ipv6 prefixes never appear in the ospf route table although ipv4 ospf neighbors are healthy. Check instead whether iPv6 routes are installed with valid OSPFv3 next hops independent of OSPFv2.

D:

It confirms an unrelated service correction: The backup interface cost was inadvertently made lower during a maintenance template change. The present case reports IPv6 prefixes never appear in the OSPF route table although IPv4 OSPF neighbors are healthy. Its completion test is IPv6 routes are installed with valid OSPFv3 next hops independent of OSPFv2.

Question 35

A remote POP is migrating OSPFv2 to IPv6 routing. Observed: IPv6 prefixes never appear in the OSPF route table although IPv4 OSPF neighbors are healthy. What underlying protocol or service configuration problem best explains the evidence?

  1. The backup interface cost was inadvertently made lower during a maintenance template change.
  2. Link network type and adjacency expectations do not match the actual segment design.
  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

C:

Because iPv6 prefixes never appear in the OSPF route table although IPv4 OSPF neighbors are healthy, the likely cause is ospfv3 protocol adjacency and ipv6 address-family enablement were not implemented. It is testable: Establish OSPFv3 neighbor formation and advertise intended IPv6 prefixes on supported interfaces. Expected follow-up: IPv6 routes are installed with valid OSPFv3 next hops independent of OSPFv2.

Incorrect Answers

A:

The backup interface cost was inadvertently made lower during a maintenance template change. would normally be accompanied by backup traffic activates before the primary fiber has failed. The observed symptom is different: IPv6 prefixes never appear in the OSPF route table although IPv4 OSPF neighbors are healthy. The likely cause is OSPFv3 protocol adjacency and IPv6 address-family enablement were not implemented.

B:

The stated cause is possible elsewhere but explains the interface stays in 2-way state although the operator expects a full relationship, not ipv6 prefixes never appear in the ospf route table although ipv4 ospf neighbors are healthy. This incident is better attributed to ospfv3 protocol adjacency and ipv6 address-family enablement were not implemented.

D:

That explanation fits another condition: Customer routing devices receive no default after the provider loses upstream connectivity. The evidence here is IPv6 prefixes never appear in the OSPF route table although IPv4 OSPF neighbors are healthy. Its closer root cause is OSPFv3 protocol adjacency and IPv6 address-family enablement were not implemented.

Question 36

A remote POP is migrating OSPFv2 to IPv6 routing. Observed: IPv6 prefixes never appear in the OSPF route table although IPv4 OSPF neighbors are healthy. Which ongoing validation gate would best detect a recurrence of this problem?

  1. For each approved related change, verify that adjacency reaches the state appropriate for the installed point-to-point design. Flag recurrence if the interface stays in 2-Way state although the operator expects a Full relationship.
  2. For each approved related change, verify that normal traffic favors the primary and failover selects backup only when intended. Flag recurrence if backup traffic activates before the primary fiber has failed.
  3. 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.
  4. 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.

Explanation

Correct Answer

D:

A useful regression gate tests whether iPv6 routes are installed with valid OSPFv3 next hops independent of OSPFv2 and alerts when iPv6 prefixes never appear in the OSPF route table although IPv4 OSPF neighbors are healthy. This directly checks the technical weakness: OSPFv3 protocol adjacency and IPv6 address-family enablement were not implemented. The gate is derived from the fictional incident and is not an independent Juniper engineer signoff.

Incorrect Answers

A:

The proposed control is tied to link network type and adjacency expectations do not match the actual segment design, typically observed when the interface stays in 2-Way state although the operator expects a Full relationship. Here the target is ospfv3 protocol adjacency and ipv6 address-family enablement were not implemented; monitor iPv6 routes are installed with valid OSPFv3 next hops independent of OSPFv2.

B:

This gate monitors a different failure, backup traffic activates before the primary fiber has failed. It would not detect the current problem: IPv6 prefixes never appear in the OSPF route table although IPv4 OSPF neighbors are healthy. The appropriate check requires iPv6 routes are installed with valid OSPFv3 next hops independent of OSPFv2.

C:

It is valid for another service scenario but checks customer routing devices receive no default after the provider loses upstream connectivity. This case instead needs a gate for ipv6 prefixes never appear in the ospf route table although ipv4 ospf neighbors are healthy and evidence that iPv6 routes are installed with valid OSPFv3 next hops independent of OSPFv2.

Question 37

Two routers exchange OSPF over a numbered point-to-point link. Observed: The interface stays in 2-Way state although the operator expects a Full relationship. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Stage a matched key transition on both ends with compatible authentication configuration.
  2. Remove the unintended interarea leak and verify area summaries and route preferences.
  3. Apply the consistent stub-area type to all routers in the area during the window.
  4. Verify matching OSPF interface network types and the proper neighbor-formation requirements.

Explanation

Correct Answer

D:

The observed condition is The interface stays in 2-Way state although the operator expects a Full relationship. That indicates link network type and adjacency expectations do not match the actual segment design. Applying the proposed remedy directly changes that condition. A concrete completion check is: Adjacency reaches the state appropriate for the installed point-to-point design.

Incorrect Answers

A:

This remediates the two routers reference incompatible authentication keys or key identifiers, normally indicated by Neighbor packets are received but rejected after routine secret rotation. It would leave the observed problem (The interface stays in 2-Way state although the operator expects a Full relationship) unresolved. Address it with verify matching OSPF interface network types and the proper neighbor-formation requirements.

B:

The option may be useful when two ABRs forward the same prefix via different areas and traffic becomes asymmetrical, but that is not the current evidence. Here, the interface stays in 2-Way state although the operator expects a Full relationship, indicating link network type and adjacency expectations do not match the actual segment design. The targeted action is Verify matching OSPF interface network types and the proper neighbor-formation requirements.

C:

This change belongs to a different OSPF issue: A neighbor goes down directly after changing only the ABR area mode. That issue involves area option bits in hellos do not agree with unchanged internal routers. The current symptom is The interface stays in 2-Way state although the operator expects a Full relationship. It instead requires verify matching OSPF interface network types and the proper neighbor-formation requirements.

Question 38

Two routers exchange OSPF over a numbered point-to-point link. Observed: The interface stays in 2-Way state although the operator expects a Full relationship. After the correction, which result would most convincingly show that this fault is resolved?

  1. Both directions use stable documented paths without unexpected duplicate interarea reachability.
  2. The adjacency remains Full and the authentication rejection counters stop increasing.
  3. All area neighbors form and the reduced external-LSA scope is as designed.
  4. Adjacency reaches the state appropriate for the installed point-to-point design.

Explanation

Correct Answer

D:

After verify matching OSPF interface network types and the proper neighbor-formation requirements, inspect whether adjacency reaches the state appropriate for the installed point-to-point design. This closes the loop between the reported observation (The interface stays in 2-Way state although the operator expects a Full relationship) and the underlying issue (Link network type and adjacency expectations do not match the actual segment design).

Incorrect Answers

A:

That observation would verify a separate fault involving an interarea route leaking policy introduced competing origin and preference paths. Its symptom is Two ABRs forward the same prefix via different areas and traffic becomes asymmetrical. For this case the actual issue is link network type and adjacency expectations do not match the actual segment design, and the relevant success signal is Adjacency reaches the state appropriate for the installed point-to-point design.

B:

This result is useful in another case with evidence Neighbor packets are received but rejected after routine secret rotation. It does not test recovery from the interface stays in 2-way state although the operator expects a full relationship. Check instead whether adjacency reaches the state appropriate for the installed point-to-point design.

C:

It confirms an unrelated service correction: Area option bits in Hellos do not agree with unchanged internal routers. The present case reports The interface stays in 2-Way state although the operator expects a Full relationship. Its completion test is Adjacency reaches the state appropriate for the installed point-to-point design.

Question 39

Two routers exchange OSPF over a numbered point-to-point link. Observed: The interface stays in 2-Way state although the operator expects a Full relationship. Which root cause is most consistent with this symptom?

  1. An interarea route leaking policy introduced competing origin and preference paths.
  2. The two routers reference incompatible authentication keys or key identifiers.
  3. Link network type and adjacency expectations do not match the actual segment design.
  4. Area option bits in Hellos do not agree with unchanged internal routers.

Explanation

Correct Answer

C:

The reported evidence—The interface stays in 2-Way state although the operator expects a Full relationship—supports link network type and adjacency expectations do not match the actual segment design. The appropriate intervention is to verify matching OSPF interface network types and the proper neighbor-formation requirements, with confirmation from adjacency reaches the state appropriate for the installed point-to-point design. Other causes require actual device-state verification.

Incorrect Answers

A:

The stated cause is possible elsewhere but explains two abrs forward the same prefix via different areas and traffic becomes asymmetrical, not the interface stays in 2-way state although the operator expects a full relationship. This incident is better attributed to link network type and adjacency expectations do not match the actual segment design.

B:

That explanation fits another condition: Neighbor packets are received but rejected after routine secret rotation. The evidence here is The interface stays in 2-Way state although the operator expects a Full relationship. Its closer root cause is Link network type and adjacency expectations do not match the actual segment design.

D:

Area option bits in Hellos do not agree with unchanged internal routers. would normally be accompanied by a neighbor goes down directly after changing only the abr area mode. The observed symptom is different: The interface stays in 2-Way state although the operator expects a Full relationship. The likely cause is Link network type and adjacency expectations do not match the actual segment design.

Question 40

Two routers exchange OSPF over a numbered point-to-point link. Observed: The interface stays in 2-Way state although the operator expects a Full relationship. Which change-acceptance control is most relevant to preventing this exact failure?

  1. For each approved related change, verify that all area neighbors form and the reduced external-LSA scope is as designed. Flag recurrence if a neighbor goes down directly after changing only the ABR area mode.
  2. For each approved related change, verify that the adjacency remains Full and the authentication rejection counters stop increasing. Flag recurrence if neighbor packets are received but rejected after routine secret rotation.
  3. 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.
  4. For each approved related change, verify that adjacency reaches the state appropriate for the installed point-to-point design. Flag recurrence if the interface stays in 2-Way state although the operator expects a Full relationship.

Explanation

Correct Answer

D:

The control is specific to the initial failure. It requires the result Adjacency reaches the state appropriate for the installed point-to-point design. and treats The interface stays in 2-Way state although the operator expects a Full relationship. as a failure signal. The causal concern is link network type and adjacency expectations do not match the actual segment design.

Incorrect Answers

A:

This gate monitors a different failure, a neighbor goes down directly after changing only the abr area mode. It would not detect the current problem: The interface stays in 2-Way state although the operator expects a Full relationship. The appropriate check requires adjacency reaches the state appropriate for the installed point-to-point design.

B:

It is valid for another service scenario but checks neighbor packets are received but rejected after routine secret rotation. This case instead needs a gate for the interface stays in 2-way state although the operator expects a full relationship and evidence that adjacency reaches the state appropriate for the installed point-to-point design.

C:

The proposed control is tied to an interarea route leaking policy introduced competing origin and preference paths, typically observed when two ABRs forward the same prefix via different areas and traffic becomes asymmetrical. Here the target is link network type and adjacency expectations do not match the actual segment design; monitor adjacency reaches the state appropriate for the installed point-to-point design.

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