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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 46

Question 450

A core service requires minimum bandwidth for control-plane routing traffic. Observed: BGP keepalives are delayed under volumetric guest transit load. Which acceptance observation best confirms that the proposed change worked?

  1. In-profile traffic passes and only true excess traffic is policed.
  2. VPN packets increment the intended queue counters and receive the agreed service.
  3. Routing sessions remain healthy while excess guest traffic is rate-limited.
  4. Video queue occupancy and packet loss improve under equivalent traffic replay.

Explanation

Correct Answer

C:

This acceptance criterion tests the actual fault. The source evidence was BGP keepalives are delayed under volumetric guest transit load. The correction addresses control-plane class lacks rate and priority protection in the congestion policy; success requires routing sessions remain healthy while excess guest traffic is rate-limited.

Incorrect Answers

A:

That observation would verify a separate fault involving the policer match or bandwidth unit differs from the intended traffic contract. Its symptom is Business telemetry is discarded even when its contracted rate is not exceeded. For this case the actual issue is control-plane class lacks rate and priority protection in the congestion policy, and the relevant success signal is Routing sessions remain healthy while excess guest traffic is rate-limited.

B:

This result is useful in another case with evidence VPN queue counters show no packets despite known VPN load. It does not test recovery from bgp keepalives are delayed under volumetric guest transit load. Check instead whether routing sessions remain healthy while excess guest traffic is rate-limited.

D:

It confirms an unrelated service correction: Queue-specific congestion and scheduler weights hide localized buffer exhaustion. The present case reports BGP keepalives are delayed under volumetric guest transit load. Its completion test is Routing sessions remain healthy while excess guest traffic is rate-limited.

Question 451

A core service requires minimum bandwidth for control-plane routing traffic. Observed: BGP keepalives are delayed under volumetric guest transit load. What is the most likely source of the observed routing or service failure?

  1. Classifier and forwarding-class mappings do not match the chosen VPN traffic selector.
  2. Queue-specific congestion and scheduler weights hide localized buffer exhaustion.
  3. The policer match or bandwidth unit differs from the intended traffic contract.
  4. Control-plane class lacks rate and priority protection in the congestion policy.

Explanation

Correct Answer

D:

This explanation is the closest match to the observed symptom: BGP keepalives are delayed under volumetric guest transit load. The specified root issue is Control-plane class lacks rate and priority protection in the congestion policy. Repair it through implement scoped control-plane protection and scheduler allocation without unbounded starvation, then check routing sessions remain healthy while excess guest traffic is rate-limited.

Incorrect Answers

A:

That explanation fits another condition: VPN queue counters show no packets despite known VPN load. The evidence here is BGP keepalives are delayed under volumetric guest transit load. Its closer root cause is Control-plane class lacks rate and priority protection in the congestion policy.

B:

Queue-specific congestion and scheduler weights hide localized buffer exhaustion. would normally be accompanied by application packet loss remains high even with low measured total interface utilization. The observed symptom is different: BGP keepalives are delayed under volumetric guest transit load. The likely cause is Control-plane class lacks rate and priority protection in the congestion policy.

C:

The stated cause is possible elsewhere but explains business telemetry is discarded even when its contracted rate is not exceeded, not bgp keepalives are delayed under volumetric guest transit load. This incident is better attributed to control-plane class lacks rate and priority protection in the congestion policy.

Question 452

A core service requires minimum bandwidth for control-plane routing traffic. Observed: BGP keepalives are delayed under volumetric guest transit load. What operational check best guards against this problem returning?

  1. For each approved related change, verify that in-profile traffic passes and only true excess traffic is policed. Flag recurrence if business telemetry is discarded even when its contracted rate is not exceeded.
  2. For each approved related change, verify that video queue occupancy and packet loss improve under equivalent traffic replay. Flag recurrence if application packet loss remains high even with low measured total interface utilization.
  3. For each approved related change, verify that routing sessions remain healthy while excess guest traffic is rate-limited. Flag recurrence if bGP keepalives are delayed under volumetric guest transit load.
  4. For each approved related change, verify that vPN packets increment the intended queue counters and receive the agreed service. Flag recurrence if vPN queue counters show no packets despite known VPN load.

Explanation

Correct Answer

C:

This control asks for the same recovery evidence (Routing sessions remain healthy while excess guest traffic is rate-limited) and flags recurrence of the same failure (BGP keepalives are delayed under volumetric guest transit load). It targets the underlying issue, control-plane class lacks rate and priority protection in the congestion policy, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

A:

The proposed control is tied to the policer match or bandwidth unit differs from the intended traffic contract, typically observed when business telemetry is discarded even when its contracted rate is not exceeded. Here the target is control-plane class lacks rate and priority protection in the congestion policy; monitor routing sessions remain healthy while excess guest traffic is rate-limited.

B:

This gate monitors a different failure, application packet loss remains high even with low measured total interface utilization. It would not detect the current problem: BGP keepalives are delayed under volumetric guest transit load. The appropriate check requires routing sessions remain healthy while excess guest traffic is rate-limited.

D:

It is valid for another service scenario but checks vpn queue counters show no packets despite known vpn load. This case instead needs a gate for bgp keepalives are delayed under volumetric guest transit load and evidence that routing sessions remain healthy while excess guest traffic is rate-limited.

Question 453

A provider schedules delay-sensitive video traffic and backup in separate queues. Observed: Application packet loss remains high even with low measured total interface utilization. Which targeted remediation is most appropriate for the observed condition?

  1. Review average queue depth thresholds and attach the intended drop profile to the proper scheduler.
  2. Establish supported hierarchical scheduler and parent shaping policy.
  3. Restore the intended multicast classification entry and corresponding scheduler.
  4. Inspect per-queue offered rate and adjust guarantees and drop settings to actual demand.

Explanation

Correct Answer

D:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—Application packet loss remains high even with low measured total interface utilization—is consistent with queue-specific congestion and scheduler weights hide localized buffer exhaustion. Use the specified correction, then verify: Video queue occupancy and packet loss improve under equivalent traffic replay. Preserve existing policy and tenant isolation.

Incorrect Answers

A:

This change belongs to a different Class of Service (CoS) issue: Tail drops occur abruptly rather than the expected early-drop progression. That issue involves the wred drop-profile threshold curve or attachment is incorrect. The current symptom is Application packet loss remains high even with low measured total interface utilization. It instead requires inspect per-queue offered rate and adjust guarantees and drop settings to actual demand.

B:

This remediates per-customer shapers are configured without enforcing a proper aggregate parent limit, normally indicated by Subinterfaces together exceed the parent shaping budget during congestion. It would leave the observed problem (Application packet loss remains high even with low measured total interface utilization) unresolved. Address it with inspect per-queue offered rate and adjust guarantees and drop settings to actual demand.

C:

The option may be useful when multicast video packets are assigned to the lowest-priority class after a classifier update, but that is not the current evidence. Here, application packet loss remains high even with low measured total interface utilization, indicating queue-specific congestion and scheduler weights hide localized buffer exhaustion. The targeted action is Inspect per-queue offered rate and adjust guarantees and drop settings to actual demand.

Question 454

A provider schedules delay-sensitive video traffic and backup in separate queues. Observed: Application packet loss remains high even with low measured total interface utilization. What evidence would validate recovery from this precise failure mode?

  1. Video queue occupancy and packet loss improve under equivalent traffic replay.
  2. Queue telemetry shows configured early-drop behavior before hard buffer exhaustion.
  3. Multicast packets land in the approved class and video impairment disappears.
  4. Aggregate egress stays within the contracted parent rate and class priorities remain intact.

Explanation

Correct Answer

A:

The intended result is Video queue occupancy and packet loss improve under equivalent traffic replay. It specifically verifies recovery from queue-specific congestion and scheduler weights hide localized buffer exhaustion, which produced the original symptom: Application packet loss remains high even with low measured total interface utilization. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

B:

It confirms an unrelated service correction: The WRED drop-profile threshold curve or attachment is incorrect. The present case reports Application packet loss remains high even with low measured total interface utilization. Its completion test is Video queue occupancy and packet loss improve under equivalent traffic replay.

C:

That observation would verify a separate fault involving the updated dscp-to-forwarding-class table misses the multicast source marking. Its symptom is Multicast video packets are assigned to the lowest-priority class after a classifier update. For this case the actual issue is queue-specific congestion and scheduler weights hide localized buffer exhaustion, and the relevant success signal is Video queue occupancy and packet loss improve under equivalent traffic replay.

D:

This result is useful in another case with evidence Subinterfaces together exceed the parent shaping budget during congestion. It does not test recovery from application packet loss remains high even with low measured total interface utilization. Check instead whether video queue occupancy and packet loss improve under equivalent traffic replay.

Question 455

A provider schedules delay-sensitive video traffic and backup in separate queues. Observed: Application packet loss remains high even with low measured total interface utilization. What underlying protocol or service configuration problem best explains the evidence?

  1. Queue-specific congestion and scheduler weights hide localized buffer exhaustion.
  2. Per-customer shapers are configured without enforcing a proper aggregate parent limit.
  3. The WRED drop-profile threshold curve or attachment is incorrect.
  4. The updated DSCP-to-forwarding-class table misses the multicast source marking.

Explanation

Correct Answer

A:

Because application packet loss remains high even with low measured total interface utilization, the likely cause is queue-specific congestion and scheduler weights hide localized buffer exhaustion. It is testable: Inspect per-queue offered rate and adjust guarantees and drop settings to actual demand. Expected follow-up: Video queue occupancy and packet loss improve under equivalent traffic replay.

Incorrect Answers

B:

That explanation fits another condition: Subinterfaces together exceed the parent shaping budget during congestion. The evidence here is Application packet loss remains high even with low measured total interface utilization. Its closer root cause is Queue-specific congestion and scheduler weights hide localized buffer exhaustion.

C:

The WRED drop-profile threshold curve or attachment is incorrect. would normally be accompanied by tail drops occur abruptly rather than the expected early-drop progression. The observed symptom is different: Application packet loss remains high even with low measured total interface utilization. The likely cause is Queue-specific congestion and scheduler weights hide localized buffer exhaustion.

D:

The stated cause is possible elsewhere but explains multicast video packets are assigned to the lowest-priority class after a classifier update, not application packet loss remains high even with low measured total interface utilization. This incident is better attributed to queue-specific congestion and scheduler weights hide localized buffer exhaustion.

Question 456

A provider schedules delay-sensitive video traffic and backup in separate queues. Observed: Application packet loss remains high even with low measured total interface utilization. Which ongoing validation gate would best detect a recurrence of this problem?

  1. For each approved related change, verify that aggregate egress stays within the contracted parent rate and class priorities remain intact. Flag recurrence if subinterfaces together exceed the parent shaping budget during congestion.
  2. For each approved related change, verify that multicast packets land in the approved class and video impairment disappears. Flag recurrence if multicast video packets are assigned to the lowest-priority class after a classifier update.
  3. For each approved related change, verify that video queue occupancy and packet loss improve under equivalent traffic replay. Flag recurrence if application packet loss remains high even with low measured total interface utilization.
  4. For each approved related change, verify that queue telemetry shows configured early-drop behavior before hard buffer exhaustion. Flag recurrence if tail drops occur abruptly rather than the expected early-drop progression.

Explanation

Correct Answer

C:

A useful regression gate tests whether video queue occupancy and packet loss improve under equivalent traffic replay and alerts when application packet loss remains high even with low measured total interface utilization. This directly checks the technical weakness: Queue-specific congestion and scheduler weights hide localized buffer exhaustion. The gate is derived from the fictional incident and is not an independent Juniper engineer signoff.

Incorrect Answers

A:

It is valid for another service scenario but checks subinterfaces together exceed the parent shaping budget during congestion. This case instead needs a gate for application packet loss remains high even with low measured total interface utilization and evidence that video queue occupancy and packet loss improve under equivalent traffic replay.

B:

The proposed control is tied to the updated dscp-to-forwarding-class table misses the multicast source marking, typically observed when multicast video packets are assigned to the lowest-priority class after a classifier update. Here the target is queue-specific congestion and scheduler weights hide localized buffer exhaustion; monitor video queue occupancy and packet loss improve under equivalent traffic replay.

D:

This gate monitors a different failure, tail drops occur abruptly rather than the expected early-drop progression. It would not detect the current problem: Application packet loss remains high even with low measured total interface utilization. The appropriate check requires video queue occupancy and packet loss improve under equivalent traffic replay.

Question 457

A multicast television service requires priority over nightly snapshots. Observed: Multicast video packets are assigned to the lowest-priority class after a classifier update. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Create supported low-latency treatment with suitable class classification and queue scheduling.
  2. Restore the intended multicast classification entry and corresponding scheduler.
  3. Separate packet-loss priority and apply compatible weighted random early drop profiles.
  4. Move the rewrite policy to the actual egress logical interface with scoped review.

Explanation

Correct Answer

B:

The observed condition is Multicast video packets are assigned to the lowest-priority class after a classifier update. That indicates the updated dscp-to-forwarding-class table misses the multicast source marking. Applying the proposed remedy directly changes that condition. A concrete completion check is: Multicast packets land in the approved class and video impairment disappears.

Incorrect Answers

A:

The option may be useful when a single FIFO queue holds both low-latency and bulk data traffic, but that is not the current evidence. Here, multicast video packets are assigned to the lowest-priority class after a classifier update, indicating the updated dscp-to-forwarding-class table misses the multicast source marking. The targeted action is Restore the intended multicast classification entry and corresponding scheduler.

C:

This change belongs to a different Class of Service (CoS) issue: Both important and disposable video packets are dropped equally in congestion. That issue involves classification does not assign distinct packet-loss priorities for drop behavior. The current symptom is Multicast video packets are assigned to the lowest-priority class after a classifier update. It instead requires restore the intended multicast classification entry and corresponding scheduler.

D:

This remediates the rewrite rule was bound to an interface with the wrong outbound direction, normally indicated by Downstream peers see markings unchanged while reverse traffic is altered unexpectedly. It would leave the observed problem (Multicast video packets are assigned to the lowest-priority class after a classifier update) unresolved. Address it with restore the intended multicast classification entry and corresponding scheduler.

Question 458

A multicast television service requires priority over nightly snapshots. Observed: Multicast video packets are assigned to the lowest-priority class after a classifier update. After the correction, which result would most convincingly show that this fault is resolved?

  1. Congestion counters show preferential dropping of disposable packets.
  2. Voice packets experience controlled latency while bulk traffic retains available capacity.
  3. Test packets on intended egress show correct markings and reverse traffic remains unchanged.
  4. Multicast packets land in the approved class and video impairment disappears.

Explanation

Correct Answer

D:

After restore the intended multicast classification entry and corresponding scheduler, inspect whether multicast packets land in the approved class and video impairment disappears. This closes the loop between the reported observation (Multicast video packets are assigned to the lowest-priority class after a classifier update) and the underlying issue (The updated DSCP-to-forwarding-class table misses the multicast source marking).

Incorrect Answers

A:

It confirms an unrelated service correction: Classification does not assign distinct packet-loss priorities for drop behavior. The present case reports Multicast video packets are assigned to the lowest-priority class after a classifier update. Its completion test is Multicast packets land in the approved class and video impairment disappears.

B:

That observation would verify a separate fault involving no separate class queue protects delay-sensitive packets from serialization backlog. Its symptom is A single FIFO queue holds both low-latency and bulk data traffic. For this case the actual issue is the updated dscp-to-forwarding-class table misses the multicast source marking, and the relevant success signal is Multicast packets land in the approved class and video impairment disappears.

C:

This result is useful in another case with evidence Downstream peers see markings unchanged while reverse traffic is altered unexpectedly. It does not test recovery from multicast video packets are assigned to the lowest-priority class after a classifier update. Check instead whether multicast packets land in the approved class and video impairment disappears.

Question 459

A multicast television service requires priority over nightly snapshots. Observed: Multicast video packets are assigned to the lowest-priority class after a classifier update. Which root cause is most consistent with this symptom?

  1. Classification does not assign distinct packet-loss priorities for drop behavior.
  2. The rewrite rule was bound to an interface with the wrong outbound direction.
  3. No separate class queue protects delay-sensitive packets from serialization backlog.
  4. The updated DSCP-to-forwarding-class table misses the multicast source marking.

Explanation

Correct Answer

D:

The reported evidence—Multicast video packets are assigned to the lowest-priority class after a classifier update—supports the updated dscp-to-forwarding-class table misses the multicast source marking. The appropriate intervention is to restore the intended multicast classification entry and corresponding scheduler, with confirmation from multicast packets land in the approved class and video impairment disappears. Other causes require actual device-state verification.

Incorrect Answers

A:

Classification does not assign distinct packet-loss priorities for drop behavior. would normally be accompanied by both important and disposable video packets are dropped equally in congestion. The observed symptom is different: Multicast video packets are assigned to the lowest-priority class after a classifier update. The likely cause is The updated DSCP-to-forwarding-class table misses the multicast source marking.

B:

That explanation fits another condition: Downstream peers see markings unchanged while reverse traffic is altered unexpectedly. The evidence here is Multicast video packets are assigned to the lowest-priority class after a classifier update. Its closer root cause is The updated DSCP-to-forwarding-class table misses the multicast source marking.

C:

The stated cause is possible elsewhere but explains a single fifo queue holds both low-latency and bulk data traffic, not multicast video packets are assigned to the lowest-priority class after a classifier update. This incident is better attributed to the updated dscp-to-forwarding-class table misses the multicast source marking.

Question 460

A multicast television service requires priority over nightly snapshots. Observed: Multicast video packets are assigned to the lowest-priority class after a classifier update. Which change-acceptance control is most relevant to preventing this exact failure?

  1. For each approved related change, verify that test packets on intended egress show correct markings and reverse traffic remains unchanged. Flag recurrence if downstream peers see markings unchanged while reverse traffic is altered unexpectedly.
  2. For each approved related change, verify that voice packets experience controlled latency while bulk traffic retains available capacity. Flag recurrence if a single FIFO queue holds both low-latency and bulk data traffic.
  3. For each approved related change, verify that congestion counters show preferential dropping of disposable packets. Flag recurrence if both important and disposable video packets are dropped equally in congestion.
  4. For each approved related change, verify that multicast packets land in the approved class and video impairment disappears. Flag recurrence if multicast video packets are assigned to the lowest-priority class after a classifier update.

Explanation

Correct Answer

D:

The control is specific to the initial failure. It requires the result Multicast packets land in the approved class and video impairment disappears. and treats Multicast video packets are assigned to the lowest-priority class after a classifier update. as a failure signal. The causal concern is the updated dscp-to-forwarding-class table misses the multicast source marking.

Incorrect Answers

A:

It is valid for another service scenario but checks downstream peers see markings unchanged while reverse traffic is altered unexpectedly. This case instead needs a gate for multicast video packets are assigned to the lowest-priority class after a classifier update and evidence that multicast packets land in the approved class and video impairment disappears.

B:

The proposed control is tied to no separate class queue protects delay-sensitive packets from serialization backlog, typically observed when a single FIFO queue holds both low-latency and bulk data traffic. Here the target is the updated dscp-to-forwarding-class table misses the multicast source marking; monitor multicast packets land in the approved class and video impairment disappears.

C:

This gate monitors a different failure, both important and disposable video packets are dropped equally in congestion. It would not detect the current problem: Multicast video packets are assigned to the lowest-priority class after a classifier update. The appropriate check requires multicast packets land in the approved class and video impairment disappears.

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