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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 10

Question 90

Two areas run OSPF with an ABR that applies area-range suppression. Observed: One exception prefix within a summarized block disappears after consolidation. Which acceptance observation best confirms that the proposed change worked?

  1. The partner external prefix is represented with a valid translated LSA in the backbone.
  2. SPF event frequency falls and legitimate topology changes still converge.
  3. Forwarding follows the installed shortest path without repeated loops.
  4. The exception installs independently while the intended aggregate is retained.

Explanation

Correct Answer

D:

This acceptance criterion tests the actual fault. The source evidence was One exception prefix within a summarized block disappears after consolidation. The correction addresses an area range was configured to suppress individual destinations too broadly; success requires the exception installs independently while the intended aggregate is retained.

Incorrect Answers

A:

That observation would verify a separate fault involving type-7 to type-5 translation has not been established by an eligible nssa border router. Its symptom is External routes learned by the NSSA ASBR never appear in area 0. For this case the actual issue is an area range was configured to suppress individual destinations too broadly, and the relevant success signal is The exception installs independently while the intended aggregate is retained.

B:

This result is useful in another case with evidence SPF CPU spikes following frequent flaps in a low-value access segment. It does not test recovery from one exception prefix within a summarized block disappears after consolidation. Check instead whether the exception installs independently while the intended aggregate is retained.

C:

It confirms an unrelated service correction: A forwarding inconsistency persists after the OSPF topology converged. The present case reports One exception prefix within a summarized block disappears after consolidation. Its completion test is The exception installs independently while the intended aggregate is retained.

Question 91

Two areas run OSPF with an ABR that applies area-range suppression. Observed: One exception prefix within a summarized block disappears after consolidation. What is the most likely source of the observed routing or service failure?

  1. An area range was configured to suppress individual destinations too broadly.
  2. Unstable access LSAs cause repeated area-wide SPF recalculation.
  3. A forwarding inconsistency persists after the OSPF topology converged.
  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: One exception prefix within a summarized block disappears after consolidation. The specified root issue is An area range was configured to suppress individual destinations too broadly. Repair it through refine the area range and ensure the exceptional prefix remains explicitly reachable, then check the exception installs independently while the intended aggregate is retained.

Incorrect Answers

B:

That explanation fits another condition: SPF CPU spikes following frequent flaps in a low-value access segment. The evidence here is One exception prefix within a summarized block disappears after consolidation. Its closer root cause is An area range was configured to suppress individual destinations too broadly.

C:

A forwarding inconsistency persists after the OSPF topology converged. would normally be accompanied by the rib points at a reachable next hop but the fib sends traffic into a loop. The observed symptom is different: One exception prefix within a summarized block disappears after consolidation. The likely cause is An area range was configured to suppress individual destinations too broadly.

D:

The stated cause is possible elsewhere but explains external routes learned by the nssa asbr never appear in area 0, not one exception prefix within a summarized block disappears after consolidation. This incident is better attributed to an area range was configured to suppress individual destinations too broadly.

Question 92

Two areas run OSPF with an ABR that applies area-range suppression. Observed: One exception prefix within a summarized block disappears after consolidation. What operational check best guards against this problem returning?

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

Explanation

Correct Answer

C:

This control asks for the same recovery evidence (The exception installs independently while the intended aggregate is retained) and flags recurrence of the same failure (One exception prefix within a summarized block disappears after consolidation). It targets the underlying issue, an area range was configured to suppress individual destinations too broadly, 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 spf cpu spikes following frequent flaps in a low-value access segment. This case instead needs a gate for one exception prefix within a summarized block disappears after consolidation and evidence that the exception installs independently while the intended aggregate is retained.

B:

This gate monitors a different failure, the rib points at a reachable next hop but the fib sends traffic into a loop. It would not detect the current problem: One exception prefix within a summarized block disappears after consolidation. The appropriate check requires the exception installs independently while the intended aggregate is retained.

D:

The proposed control is tied to type-7 to type-5 translation has not been established by an eligible nssa border router, typically observed when external routes learned by the NSSA ASBR never appear in area 0. Here the target is an area range was configured to suppress individual destinations too broadly; monitor the exception installs independently while the intended aggregate is retained.

Question 93

An OSPF PE advertises a route over a parallel backbone topology. Observed: The RIB points at a reachable next hop but the FIB sends traffic into a loop. Which targeted remediation is most appropriate for the observed condition?

  1. Check actual OSPF path cost and supported ECMP configuration before enabling both.
  2. Restore a legitimate backbone connection or a supported temporary virtual link through a valid transit area.
  3. Compare RIB, FIB and adjacency state and clear the identified stale forwarding entry safely.
  4. Assign distinct stable router IDs and restart adjacencies in a controlled order.

Explanation

Correct Answer

C:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—The RIB points at a reachable next hop but the FIB sends traffic into a loop—is consistent with a forwarding inconsistency persists after the ospf topology converged. Use the specified correction, then verify: Forwarding follows the installed shortest path without repeated loops. Preserve existing policy and tenant isolation.

Incorrect Answers

A:

The option may be useful when only one of two intended equal-cost paths is used after topology changes, but that is not the current evidence. Here, the RIB points at a reachable next hop but the FIB sends traffic into a loop, indicating a forwarding inconsistency persists after the ospf topology converged. The targeted action is Compare RIB, FIB and adjacency state and clear the identified stale forwarding entry safely.

B:

This remediates the area no longer has a continuous logical attachment to area 0, normally indicated by One nonbackbone area becomes unreachable although all its local neighbors remain Full. It would leave the observed problem (The RIB points at a reachable next hop but the FIB sends traffic into a loop) unresolved. Address it with compare RIB, FIB and adjacency state and clear the identified stale forwarding entry safely.

D:

This change belongs to a different OSPF issue: Two nodes advertise the same router ID and neighbor behavior becomes unstable. That issue involves duplicate ospf router ids prevent unambiguous lsa ownership. The current symptom is The RIB points at a reachable next hop but the FIB sends traffic into a loop. It instead requires compare RIB, FIB and adjacency state and clear the identified stale forwarding entry safely.

Question 94

An OSPF PE advertises a route over a parallel backbone topology. Observed: The RIB points at a reachable next hop but the FIB sends traffic into a loop. What evidence would validate recovery from this precise failure mode?

  1. Interarea destinations return without introducing disconnected backbone islands.
  2. The route table lists both intended equal-cost next hops and traffic distribution behaves as designed.
  3. Forwarding follows the installed shortest path without repeated loops.
  4. LSDB router LSA identities are unique and all intended neighbors become Full.

Explanation

Correct Answer

C:

The intended result is Forwarding follows the installed shortest path without repeated loops. It specifically verifies recovery from a forwarding inconsistency persists after the ospf topology converged, which produced the original symptom: The RIB points at a reachable next hop but the FIB sends traffic into a loop. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

This result is useful in another case with evidence One nonbackbone area becomes unreachable although all its local neighbors remain Full. It does not test recovery from the rib points at a reachable next hop but the fib sends traffic into a loop. Check instead whether forwarding follows the installed shortest path without repeated loops.

B:

That observation would verify a separate fault involving the route metrics are unequal or forwarding ecmp limits do not allow the second path. Its symptom is Only one of two intended equal-cost paths is used after topology changes. For this case the actual issue is a forwarding inconsistency persists after the ospf topology converged, and the relevant success signal is Forwarding follows the installed shortest path without repeated loops.

D:

It confirms an unrelated service correction: Duplicate OSPF router IDs prevent unambiguous LSA ownership. The present case reports The RIB points at a reachable next hop but the FIB sends traffic into a loop. Its completion test is Forwarding follows the installed shortest path without repeated loops.

Question 95

An OSPF PE advertises a route over a parallel backbone topology. Observed: The RIB points at a reachable next hop but the FIB sends traffic into a loop. What underlying protocol or service configuration problem best explains the evidence?

  1. Duplicate OSPF router IDs prevent unambiguous LSA ownership.
  2. The route metrics are unequal or forwarding ECMP limits do not allow the second path.
  3. The area no longer has a continuous logical attachment to area 0.
  4. A forwarding inconsistency persists after the OSPF topology converged.

Explanation

Correct Answer

D:

Because the RIB points at a reachable next hop but the FIB sends traffic into a loop, the likely cause is a forwarding inconsistency persists after the ospf topology converged. It is testable: Compare RIB, FIB and adjacency state and clear the identified stale forwarding entry safely. Expected follow-up: Forwarding follows the installed shortest path without repeated loops.

Incorrect Answers

A:

Duplicate OSPF router IDs prevent unambiguous LSA ownership. would normally be accompanied by two nodes advertise the same router id and neighbor behavior becomes unstable. The observed symptom is different: The RIB points at a reachable next hop but the FIB sends traffic into a loop. The likely cause is A forwarding inconsistency persists after the OSPF topology converged.

B:

The stated cause is possible elsewhere but explains only one of two intended equal-cost paths is used after topology changes, not the rib points at a reachable next hop but the fib sends traffic into a loop. This incident is better attributed to a forwarding inconsistency persists after the ospf topology converged.

C:

That explanation fits another condition: One nonbackbone area becomes unreachable although all its local neighbors remain Full. The evidence here is The RIB points at a reachable next hop but the FIB sends traffic into a loop. Its closer root cause is A forwarding inconsistency persists after the OSPF topology converged.

Question 96

An OSPF PE advertises a route over a parallel backbone topology. Observed: The RIB points at a reachable next hop but the FIB sends traffic into a loop. Which ongoing validation gate would best detect a recurrence of this problem?

  1. 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.
  2. For each approved related change, verify that the route table lists both intended equal-cost next hops and traffic distribution behaves as designed. Flag recurrence if only one of two intended equal-cost paths is used after topology changes.
  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 interarea destinations return without introducing disconnected backbone islands. Flag recurrence if one nonbackbone area becomes unreachable although all its local neighbors remain Full.

Explanation

Correct Answer

A:

A useful regression gate tests whether forwarding follows the installed shortest path without repeated loops and alerts when the RIB points at a reachable next hop but the FIB sends traffic into a loop. This directly checks the technical weakness: A forwarding inconsistency persists after the OSPF topology converged. The gate is derived from the fictional incident and is not an independent Juniper engineer signoff.

Incorrect Answers

B:

The proposed control is tied to the route metrics are unequal or forwarding ecmp limits do not allow the second path, typically observed when only one of two intended equal-cost paths is used after topology changes. Here the target is a forwarding inconsistency persists after the ospf topology converged; monitor forwarding follows the installed shortest path without repeated loops.

C:

This gate monitors a different failure, two nodes advertise the same router id and neighbor behavior becomes unstable. It would not detect the current problem: The RIB points at a reachable next hop but the FIB sends traffic into a loop. The appropriate check requires forwarding follows the installed shortest path without repeated loops.

D:

It is valid for another service scenario but checks one nonbackbone area becomes unreachable although all its local neighbors remain full. This case instead needs a gate for the rib points at a reachable next hop but the fib sends traffic into a loop and evidence that forwarding follows the installed shortest path without repeated loops.

Question 97

A remote service chain relies on equal-cost OSPF exits. Observed: Only one of two intended equal-cost paths is used after topology changes. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Reconcile link-state database state using supported neighbor reset and source-of-LSA checks.
  2. Align the actual hello/dead intervals and inspect received Hello parameter fields.
  3. Adjust interface OSPF costs consistently on both transit paths and review resulting shortest paths.
  4. Check actual OSPF path cost and supported ECMP configuration before enabling both.

Explanation

Correct Answer

D:

The observed condition is Only one of two intended equal-cost paths is used after topology changes. That indicates the route metrics are unequal or forwarding ecmp limits do not allow the second path. Applying the proposed remedy directly changes that condition. A concrete completion check is: The route table lists both intended equal-cost next hops and traffic distribution behaves as designed.

Incorrect Answers

A:

This remediates a stale lsdb instance and lsa sequence interaction are preventing clean convergence, normally indicated by Several neighbors repeatedly exchange database descriptions without completing synchronization. It would leave the observed problem (Only one of two intended equal-cost paths is used after topology changes) unresolved. Address it with check actual OSPF path cost and supported ECMP configuration before enabling both.

B:

The option may be useful when one neighbor never forms adjacency although ping and VLAN connectivity work, but that is not the current evidence. Here, only one of two intended equal-cost paths is used after topology changes, indicating the route metrics are unequal or forwarding ecmp limits do not allow the second path. The targeted action is Check actual OSPF path cost and supported ECMP configuration before enabling both.

C:

This change belongs to a different OSPF issue: Traffic keeps using a longer-delay path after a higher-speed circuit is installed. That issue involves interface costs still reflect old capacity assumptions instead of the operator's intended metric model. The current symptom is Only one of two intended equal-cost paths is used after topology changes. It instead requires check actual OSPF path cost and supported ECMP configuration before enabling both.

Question 98

A remote service chain relies on equal-cost OSPF exits. Observed: Only one of two intended equal-cost paths is used after topology changes. After the correction, which result would most convincingly show that this fault is resolved?

  1. The chosen route and forwarding next hop match the documented cost comparison.
  2. The LSDB converges to matching current LSA instances and neighbors remain Full.
  3. Adjacencies form normally without relying on reduced safety checks.
  4. The route table lists both intended equal-cost next hops and traffic distribution behaves as designed.

Explanation

Correct Answer

D:

After check actual OSPF path cost and supported ECMP configuration before enabling both, inspect whether the route table lists both intended equal-cost next hops and traffic distribution behaves as designed. This closes the loop between the reported observation (Only one of two intended equal-cost paths is used after topology changes) and the underlying issue (The route metrics are unequal or forwarding ECMP limits do not allow the second path).

Incorrect Answers

A:

It confirms an unrelated service correction: Interface costs still reflect old capacity assumptions instead of the operator's intended metric model. The present case reports Only one of two intended equal-cost paths is used after topology changes. Its completion test is The route table lists both intended equal-cost next hops and traffic distribution behaves as designed.

B:

This result is useful in another case with evidence Several neighbors repeatedly exchange database descriptions without completing synchronization. It does not test recovery from only one of two intended equal-cost paths is used after topology changes. Check instead whether the route table lists both intended equal-cost next hops and traffic distribution behaves as designed.

C:

That observation would verify a separate fault involving hello and dead timer settings differ across the candidate neighbors. Its symptom is One neighbor never forms adjacency although ping and VLAN connectivity work. For this case the actual issue is the route metrics are unequal or forwarding ecmp limits do not allow the second path, and the relevant success signal is The route table lists both intended equal-cost next hops and traffic distribution behaves as designed.

Question 99

A remote service chain relies on equal-cost OSPF exits. Observed: Only one of two intended equal-cost paths is used after topology changes. Which root cause is most consistent with this symptom?

  1. A stale LSDB instance and LSA sequence interaction are preventing clean convergence.
  2. Interface costs still reflect old capacity assumptions instead of the operator's intended metric model.
  3. The route metrics are unequal or forwarding ECMP limits do not allow the second path.
  4. Hello and dead timer settings differ across the candidate neighbors.

Explanation

Correct Answer

C:

The reported evidence—Only one of two intended equal-cost paths is used after topology changes—supports the route metrics are unequal or forwarding ecmp limits do not allow the second path. The appropriate intervention is to check actual OSPF path cost and supported ECMP configuration before enabling both, with confirmation from the route table lists both intended equal-cost next hops and traffic distribution behaves as designed. Other causes require actual device-state verification.

Incorrect Answers

A:

That explanation fits another condition: Several neighbors repeatedly exchange database descriptions without completing synchronization. The evidence here is Only one of two intended equal-cost paths is used after topology changes. Its closer root cause is The route metrics are unequal or forwarding ECMP limits do not allow the second path.

B:

Interface costs still reflect old capacity assumptions instead of the operator's intended metric model. would normally be accompanied by traffic keeps using a longer-delay path after a higher-speed circuit is installed. The observed symptom is different: Only one of two intended equal-cost paths is used after topology changes. The likely cause is The route metrics are unequal or forwarding ECMP limits do not allow the second path.

D:

The stated cause is possible elsewhere but explains one neighbor never forms adjacency although ping and vlan connectivity work, not only one of two intended equal-cost paths is used after topology changes. This incident is better attributed to the route metrics are unequal or forwarding ecmp limits do not allow the second path.

Question 100

A remote service chain relies on equal-cost OSPF exits. Observed: Only one of two intended equal-cost paths is used after topology changes. Which change-acceptance control is most relevant to preventing this exact failure?

  1. For each approved related change, verify that the route table lists both intended equal-cost next hops and traffic distribution behaves as designed. Flag recurrence if only one of two intended equal-cost paths is used after topology changes.
  2. For each approved related change, verify that the chosen route and forwarding next hop match the documented cost comparison. Flag recurrence if traffic keeps using a longer-delay path after a higher-speed circuit is installed.
  3. 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.
  4. 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.

Explanation

Correct Answer

A:

The control is specific to the initial failure. It requires the result The route table lists both intended equal-cost next hops and traffic distribution behaves as designed. and treats Only one of two intended equal-cost paths is used after topology changes. as a failure signal. The causal concern is the route metrics are unequal or forwarding ecmp limits do not allow the second path.

Incorrect Answers

B:

This gate monitors a different failure, traffic keeps using a longer-delay path after a higher-speed circuit is installed. It would not detect the current problem: Only one of two intended equal-cost paths is used after topology changes. The appropriate check requires the route table lists both intended equal-cost next hops and traffic distribution behaves as designed.

C:

The proposed control is tied to hello and dead timer settings differ across the candidate neighbors, typically observed when one neighbor never forms adjacency although ping and VLAN connectivity work. Here the target is the route metrics are unequal or forwarding ecmp limits do not allow the second path; monitor the route table lists both intended equal-cost next hops and traffic distribution behaves as designed.

D:

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 only one of two intended equal-cost paths is used after topology changes and evidence that the route table lists both intended equal-cost next hops and traffic distribution behaves as designed.

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