McAfee-Secured Website

Exam Code: JN0-664

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

Certification Provider: Juniper

Corresponding Certification: JNCIP-SP

100% Juniper JN0-664 Guaranteed Success With Testking Training Materials

Get Real JN0-664 Exam Questions & Expert Verified Answers as Experienced on the Real Exam!

96 Questions & Answers with Testing Engine

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

Pass your tests with the always up-to-date JN0-664 Exam Engine. Your JN0-664 training materials keep you at the head of the pack!

Satisfaction Guaranteed

Money Back Guarantee

Testking provides hassle-free money back guarantee with our products. That is because we have 100% trust in the abilities of our professional and experience product team, and our record is a proof of that.

99.6% PASS RATE
Was: $137.49
Now: $124.99

Juniper JN0-664 Practice Test 6

Question 50

A multi-area OSPF service-provider network carries hundreds of branch subnets. Observed: SPF CPU spikes following frequent flaps in a low-value access segment. After the correction, which result would most convincingly show that this fault is resolved?

  1. Affected prefixes have stable origin and route reimport loops stop.
  2. SPF event frequency falls and legitimate topology changes still converge.
  3. LSDB router LSA identities are unique and all intended neighbors become Full.
  4. Branch LSDBs contain the expected default route without unrelated interarea prefixes.

Explanation

Correct Answer

B:

After repair the flapping link and tune supported convergence controls without masking real failures, inspect whether sPF event frequency falls and legitimate topology changes still converge. This closes the loop between the reported observation (SPF CPU spikes following frequent flaps in a low-value access segment) and the underlying issue (Unstable access LSAs cause repeated area-wide SPF recalculation).

Incorrect Answers

A:

It confirms an unrelated service correction: Redistribution tags and loop-prevention controls were omitted. The present case reports SPF CPU spikes following frequent flaps in a low-value access segment. Its completion test is SPF event frequency falls and legitimate topology changes still converge.

C:

This result is useful in another case with evidence Two nodes advertise the same router ID and neighbor behavior becomes unstable. It does not test recovery from spf cpu spikes following frequent flaps in a low-value access segment. Check instead whether sPF event frequency falls and legitimate topology changes still converge.

D:

That observation would verify a separate fault involving the totally stubby default-route and interarea advertisement policy is not consistently applied. Its symptom is Branch routers still receive numerous interarea type-3 advertisements after migration. For this case the actual issue is unstable access lsas cause repeated area-wide spf recalculation, and the relevant success signal is SPF event frequency falls and legitimate topology changes still converge.

Question 51

A multi-area OSPF service-provider network carries hundreds of branch subnets. Observed: SPF CPU spikes following frequent flaps in a low-value access segment. Which root cause is most consistent with this symptom?

  1. The totally stubby default-route and interarea advertisement policy is not consistently applied.
  2. Duplicate OSPF router IDs prevent unambiguous LSA ownership.
  3. Redistribution tags and loop-prevention controls were omitted.
  4. Unstable access LSAs cause repeated area-wide SPF recalculation.

Explanation

Correct Answer

D:

The reported evidence—SPF CPU spikes following frequent flaps in a low-value access segment—supports unstable access lsas cause repeated area-wide spf recalculation. The appropriate intervention is to repair the flapping link and tune supported convergence controls without masking real failures, with confirmation from sPF event frequency falls and legitimate topology changes still converge. Other causes require actual device-state verification.

Incorrect Answers

A:

The stated cause is possible elsewhere but explains branch routers still receive numerous interarea type-3 advertisements after migration, not spf cpu spikes following frequent flaps in a low-value access segment. This incident is better attributed to unstable access lsas cause repeated area-wide spf recalculation.

B:

That explanation fits another condition: Two nodes advertise the same router ID and neighbor behavior becomes unstable. The evidence here is SPF CPU spikes following frequent flaps in a low-value access segment. Its closer root cause is Unstable access LSAs cause repeated area-wide SPF recalculation.

C:

Redistribution tags and loop-prevention controls were omitted. would normally be accompanied by remote nodes see overlapping routes that oscillate after the import policy changes. The observed symptom is different: SPF CPU spikes following frequent flaps in a low-value access segment. The likely cause is Unstable access LSAs cause repeated area-wide SPF recalculation.

Question 52

A multi-area OSPF service-provider network carries hundreds of branch subnets. Observed: SPF CPU spikes following frequent flaps in a low-value access segment. Which change-acceptance control is most relevant to preventing this exact failure?

  1. For each approved related change, verify that lSDB router LSA identities are unique and all intended neighbors become Full. Flag recurrence if two nodes advertise the same router ID and neighbor behavior becomes unstable.
  2. For each approved related change, verify that branch LSDBs contain the expected default route without unrelated interarea prefixes. Flag recurrence if branch routers still receive numerous interarea type-3 advertisements after migration.
  3. For each approved related change, verify that affected prefixes have stable origin and route reimport loops stop. Flag recurrence if remote nodes see overlapping routes that oscillate after the import policy changes.
  4. For each approved related change, verify that sPF event frequency falls and legitimate topology changes still converge. Flag recurrence if sPF CPU spikes following frequent flaps in a low-value access segment.

Explanation

Correct Answer

D:

The control is specific to the initial failure. It requires the result SPF event frequency falls and legitimate topology changes still converge. and treats SPF CPU spikes following frequent flaps in a low-value access segment. as a failure signal. The causal concern is unstable access lsas cause repeated area-wide spf recalculation.

Incorrect Answers

A:

It is valid for another service scenario but checks two nodes advertise the same router id and neighbor behavior becomes unstable. This case instead needs a gate for spf cpu spikes following frequent flaps in a low-value access segment and evidence that sPF event frequency falls and legitimate topology changes still converge.

B:

The proposed control is tied to the totally stubby default-route and interarea advertisement policy is not consistently applied, typically observed when branch routers still receive numerous interarea type-3 advertisements after migration. Here the target is unstable access lsas cause repeated area-wide spf recalculation; monitor sPF event frequency falls and legitimate topology changes still converge.

C:

This gate monitors a different failure, remote nodes see overlapping routes that oscillate after the import policy changes. It would not detect the current problem: SPF CPU spikes following frequent flaps in a low-value access segment. The appropriate check requires sPF event frequency falls and legitimate topology changes still converge.

Question 53

An OSPF area border changes router IDs during an upgrade. Observed: Two nodes advertise the same router ID and neighbor behavior becomes unstable. What should the routing engineer change first to address this particular symptom?

  1. Inspect NSSA ABR translator selection and enable the supported external translation behavior.
  2. Assign distinct stable router IDs and restart adjacencies in a controlled order.
  3. Align the actual hello/dead intervals and inspect received Hello parameter fields.
  4. Refine the area range and ensure the exceptional prefix remains explicitly reachable.

Explanation

Correct Answer

B:

The decisive evidence is that Two nodes advertise the same router ID and neighbor behavior becomes unstable. This follows from duplicate ospf router ids prevent unambiguous lsa ownership. The focused remedy is to assign distinct stable router IDs and restart adjacencies in a controlled order. Confirm improvement when lSDB router LSA identities are unique and all intended neighbors become Full. Validate on an approved lab or change window before touching production.

Incorrect Answers

A:

This remediates type-7 to type-5 translation has not been established by an eligible nssa border router, normally indicated by External routes learned by the NSSA ASBR never appear in area 0. It would leave the observed problem (Two nodes advertise the same router ID and neighbor behavior becomes unstable) unresolved. Address it with assign distinct stable router IDs and restart adjacencies in a controlled order.

C:

This change belongs to a different OSPF issue: One neighbor never forms adjacency although ping and VLAN connectivity work. That issue involves hello and dead timer settings differ across the candidate neighbors. The current symptom is Two nodes advertise the same router ID and neighbor behavior becomes unstable. It instead requires assign distinct stable router IDs and restart adjacencies in a controlled order.

D:

The option may be useful when one exception prefix within a summarized block disappears after consolidation, but that is not the current evidence. Here, two nodes advertise the same router ID and neighbor behavior becomes unstable, indicating duplicate ospf router ids prevent unambiguous lsa ownership. The targeted action is Assign distinct stable router IDs and restart adjacencies in a controlled order.

Question 54

An OSPF area border changes router IDs during an upgrade. Observed: Two nodes advertise the same router ID and neighbor behavior becomes unstable. Which acceptance observation best confirms that the proposed change worked?

  1. Adjacencies form normally without relying on reduced safety checks.
  2. The partner external prefix is represented with a valid translated LSA in the backbone.
  3. LSDB router LSA identities are unique and all intended neighbors become Full.
  4. The exception installs independently while the intended aggregate is retained.

Explanation

Correct Answer

C:

This acceptance criterion tests the actual fault. The source evidence was Two nodes advertise the same router ID and neighbor behavior becomes unstable. The correction addresses duplicate ospf router ids prevent unambiguous lsa ownership; success requires lSDB router LSA identities are unique and all intended neighbors become Full.

Incorrect Answers

A:

It confirms an unrelated service correction: Hello and dead timer settings differ across the candidate neighbors. The present case reports Two nodes advertise the same router ID and neighbor behavior becomes unstable. Its completion test is LSDB router LSA identities are unique and all intended neighbors become Full.

B:

This result is useful in another case with evidence External routes learned by the NSSA ASBR never appear in area 0. It does not test recovery from two nodes advertise the same router id and neighbor behavior becomes unstable. Check instead whether lSDB router LSA identities are unique and all intended neighbors become Full.

D:

That observation would verify a separate fault involving an area range was configured to suppress individual destinations too broadly. Its symptom is One exception prefix within a summarized block disappears after consolidation. For this case the actual issue is duplicate ospf router ids prevent unambiguous lsa ownership, and the relevant success signal is LSDB router LSA identities are unique and all intended neighbors become Full.

Question 55

An OSPF area border changes router IDs during an upgrade. Observed: Two nodes advertise the same router ID and neighbor behavior becomes unstable. What is the most likely source of the observed routing or service failure?

  1. Duplicate OSPF router IDs prevent unambiguous LSA ownership.
  2. An area range was configured to suppress individual destinations too broadly.
  3. Hello and dead timer settings differ across the candidate neighbors.
  4. Type-7 to type-5 translation has not been established by an eligible NSSA border router.

Explanation

Correct Answer

A:

This explanation is the closest match to the observed symptom: Two nodes advertise the same router ID and neighbor behavior becomes unstable. The specified root issue is Duplicate OSPF router IDs prevent unambiguous LSA ownership. Repair it through assign distinct stable router IDs and restart adjacencies in a controlled order, then check lSDB router LSA identities are unique and all intended neighbors become Full.

Incorrect Answers

B:

The stated cause is possible elsewhere but explains one exception prefix within a summarized block disappears after consolidation, not two nodes advertise the same router id and neighbor behavior becomes unstable. This incident is better attributed to duplicate ospf router ids prevent unambiguous lsa ownership.

C:

Hello and dead timer settings differ across the candidate neighbors. would normally be accompanied by one neighbor never forms adjacency although ping and vlan connectivity work. The observed symptom is different: Two nodes advertise the same router ID and neighbor behavior becomes unstable. The likely cause is Duplicate OSPF router IDs prevent unambiguous LSA ownership.

D:

That explanation fits another condition: External routes learned by the NSSA ASBR never appear in area 0. The evidence here is Two nodes advertise the same router ID and neighbor behavior becomes unstable. Its closer root cause is Duplicate OSPF router IDs prevent unambiguous LSA ownership.

Question 56

An OSPF area border changes router IDs during an upgrade. Observed: Two nodes advertise the same router ID and neighbor behavior becomes unstable. What operational check best guards against this problem returning?

  1. For each approved related change, verify that the partner external prefix is represented with a valid translated LSA in the backbone. Flag recurrence if external routes learned by the NSSA ASBR never appear in area 0.
  2. For each approved related change, verify that adjacencies form normally without relying on reduced safety checks. Flag recurrence if one neighbor never forms adjacency although ping and VLAN connectivity work.
  3. For each approved related change, verify that lSDB router LSA identities are unique and all intended neighbors become Full. Flag recurrence if two nodes advertise the same router ID and neighbor behavior becomes unstable.
  4. For each approved related change, verify that the exception installs independently while the intended aggregate is retained. Flag recurrence if one exception prefix within a summarized block disappears after consolidation.

Explanation

Correct Answer

C:

This control asks for the same recovery evidence (LSDB router LSA identities are unique and all intended neighbors become Full) and flags recurrence of the same failure (Two nodes advertise the same router ID and neighbor behavior becomes unstable). It targets the underlying issue, duplicate ospf router ids prevent unambiguous lsa ownership, 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 external routes learned by the nssa asbr never appear in area 0. This case instead needs a gate for two nodes advertise the same router id and neighbor behavior becomes unstable and evidence that lSDB router LSA identities are unique and all intended neighbors become Full.

B:

This gate monitors a different failure, one neighbor never forms adjacency although ping and vlan connectivity work. It would not detect the current problem: Two nodes advertise the same router ID and neighbor behavior becomes unstable. The appropriate check requires lSDB router LSA identities are unique and all intended neighbors become Full.

D:

The proposed control is tied to an area range was configured to suppress individual destinations too broadly, typically observed when one exception prefix within a summarized block disappears after consolidation. Here the target is duplicate ospf router ids prevent unambiguous lsa ownership; monitor lSDB router LSA identities are unique and all intended neighbors become Full.

Question 57

A shared Ethernet OSPF segment contains three routers at different software releases. Observed: One neighbor never forms adjacency although ping and VLAN connectivity work. Which targeted remediation is most appropriate for the observed condition?

  1. Align the actual hello/dead intervals and inspect received Hello parameter fields.
  2. Configure the customer-facing interface as passive while retaining its connected-prefix advertisement.
  3. Restore a legitimate backbone connection or a supported temporary virtual link through a valid transit area.
  4. Compare RIB, FIB and adjacency state and clear the identified stale forwarding entry safely.

Explanation

Correct Answer

A:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—One neighbor never forms adjacency although ping and VLAN connectivity work—is consistent with hello and dead timer settings differ across the candidate neighbors. Use the specified correction, then verify: Adjacencies form normally without relying on reduced safety checks. Preserve existing policy and tenant isolation.

Incorrect Answers

B:

The option may be useful when a multicast Hello is sent into the customer VLAN during onboarding, but that is not the current evidence. Here, one neighbor never forms adjacency although ping and VLAN connectivity work, indicating hello and dead timer settings differ across the candidate neighbors. The targeted action is Align the actual hello/dead intervals and inspect received Hello parameter fields.

C:

This change belongs to a different OSPF issue: One nonbackbone area becomes unreachable although all its local neighbors remain Full. That issue involves the area no longer has a continuous logical attachment to area 0. The current symptom is One neighbor never forms adjacency although ping and VLAN connectivity work. It instead requires align the actual hello/dead intervals and inspect received Hello parameter fields.

D:

This remediates a forwarding inconsistency persists after the ospf topology converged, normally indicated by The RIB points at a reachable next hop but the FIB sends traffic into a loop. It would leave the observed problem (One neighbor never forms adjacency although ping and VLAN connectivity work) unresolved. Address it with align the actual hello/dead intervals and inspect received Hello parameter fields.

Question 58

A shared Ethernet OSPF segment contains three routers at different software releases. Observed: One neighbor never forms adjacency although ping and VLAN connectivity work. What evidence would validate recovery from this precise failure mode?

  1. Forwarding follows the installed shortest path without repeated loops.
  2. Interarea destinations return without introducing disconnected backbone islands.
  3. Adjacencies form normally without relying on reduced safety checks.
  4. No OSPF Hellos leave the interface and permitted internal routes remain advertised.

Explanation

Correct Answer

C:

The intended result is Adjacencies form normally without relying on reduced safety checks. It specifically verifies recovery from hello and dead timer settings differ across the candidate neighbors, which produced the original symptom: One neighbor never forms adjacency although ping and VLAN connectivity work. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

This result is useful in another case with evidence The RIB points at a reachable next hop but the FIB sends traffic into a loop. It does not test recovery from one neighbor never forms adjacency although ping and vlan connectivity work. Check instead whether adjacencies form normally without relying on reduced safety checks.

B:

It confirms an unrelated service correction: The area no longer has a continuous logical attachment to area 0. The present case reports One neighbor never forms adjacency although ping and VLAN connectivity work. Its completion test is Adjacencies form normally without relying on reduced safety checks.

D:

That observation would verify a separate fault involving ospf was enabled for route advertisement but the interface was not made passive. Its symptom is A multicast Hello is sent into the customer VLAN during onboarding. For this case the actual issue is hello and dead timer settings differ across the candidate neighbors, and the relevant success signal is Adjacencies form normally without relying on reduced safety checks.

Question 59

A shared Ethernet OSPF segment contains three routers at different software releases. Observed: One neighbor never forms adjacency although ping and VLAN connectivity work. What underlying protocol or service configuration problem best explains the evidence?

  1. Hello and dead timer settings differ across the candidate neighbors.
  2. OSPF was enabled for route advertisement but the interface was not made passive.
  3. A forwarding inconsistency persists after the OSPF topology converged.
  4. The area no longer has a continuous logical attachment to area 0.

Explanation

Correct Answer

A:

Because one neighbor never forms adjacency although ping and VLAN connectivity work, the likely cause is hello and dead timer settings differ across the candidate neighbors. It is testable: Align the actual hello/dead intervals and inspect received Hello parameter fields. Expected follow-up: Adjacencies form normally without relying on reduced safety checks.

Incorrect Answers

B:

The stated cause is possible elsewhere but explains a multicast hello is sent into the customer vlan during onboarding, not one neighbor never forms adjacency although ping and vlan connectivity work. This incident is better attributed to hello and dead timer settings differ across the candidate neighbors.

C:

That explanation fits another condition: The RIB points at a reachable next hop but the FIB sends traffic into a loop. The evidence here is One neighbor never forms adjacency although ping and VLAN connectivity work. Its closer root cause is Hello and dead timer settings differ across the candidate neighbors.

D:

The area no longer has a continuous logical attachment to area 0. would normally be accompanied by one nonbackbone area becomes unreachable although all its local neighbors remain full. The observed symptom is different: One neighbor never forms adjacency although ping and VLAN connectivity work. The likely cause is Hello and dead timer settings differ across the candidate neighbors.

Question 60

A shared Ethernet OSPF segment contains three routers at different software releases. Observed: One neighbor never forms adjacency although ping and VLAN connectivity work. Which ongoing validation gate would best detect a recurrence of this problem?

  1. For each approved related change, verify that adjacencies form normally without relying on reduced safety checks. Flag recurrence if one neighbor never forms adjacency although ping and VLAN connectivity work.
  2. For each approved related change, verify that interarea destinations return without introducing disconnected backbone islands. Flag recurrence if one nonbackbone area becomes unreachable although all its local neighbors remain Full.
  3. For each approved related change, verify that no OSPF Hellos leave the interface and permitted internal routes remain advertised. Flag recurrence if a multicast Hello is sent into the customer VLAN during onboarding.
  4. For each approved related change, verify that forwarding follows the installed shortest path without repeated loops. Flag recurrence if the RIB points at a reachable next hop but the FIB sends traffic into a loop.

Explanation

Correct Answer

A:

A useful regression gate tests whether adjacencies form normally without relying on reduced safety checks and alerts when one neighbor never forms adjacency although ping and VLAN connectivity work. This directly checks the technical weakness: Hello and dead timer settings differ across the candidate neighbors. The gate is derived from the fictional incident and is not an independent Juniper engineer signoff.

Incorrect Answers

B:

This gate monitors a different failure, one nonbackbone area becomes unreachable although all its local neighbors remain full. It would not detect the current problem: One neighbor never forms adjacency although ping and VLAN connectivity work. The appropriate check requires adjacencies form normally without relying on reduced safety checks.

C:

The proposed control is tied to ospf was enabled for route advertisement but the interface was not made passive, typically observed when a multicast Hello is sent into the customer VLAN during onboarding. Here the target is hello and dead timer settings differ across the candidate neighbors; monitor adjacencies form normally without relying on reduced safety checks.

D:

It is valid for another service scenario but checks the rib points at a reachable next hop but the fib sends traffic into a loop. This case instead needs a gate for one neighbor never forms adjacency although ping and vlan connectivity work and evidence that adjacencies form normally without relying on reduced safety checks.

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