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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 40

Question 390

A service provider configures hierarchical scheduling for customer traffic. Observed: Subinterfaces together exceed the parent shaping budget during congestion. Which acceptance observation best confirms that the proposed change worked?

  1. Congestion counters show preferential dropping of disposable packets.
  2. Video queue occupancy and packet loss improve under equivalent traffic replay.
  3. Queue telemetry shows configured early-drop behavior before hard buffer exhaustion.
  4. Aggregate egress stays within the contracted parent rate and class priorities remain intact.

Explanation

Correct Answer

D:

This acceptance criterion tests the actual fault. The source evidence was Subinterfaces together exceed the parent shaping budget during congestion. The correction addresses per-customer shapers are configured without enforcing a proper aggregate parent limit; success requires aggregate egress stays within the contracted parent rate and class priorities remain intact.

Incorrect Answers

A:

It confirms an unrelated service correction: Classification does not assign distinct packet-loss priorities for drop behavior. The present case reports Subinterfaces together exceed the parent shaping budget during congestion. Its completion test is Aggregate egress stays within the contracted parent rate and class priorities remain intact.

B:

This result is useful in another case with evidence Application packet loss remains high even with low measured total interface utilization. It does not test recovery from subinterfaces together exceed the parent shaping budget during congestion. Check instead whether aggregate egress stays within the contracted parent rate and class priorities remain intact.

C:

That observation would verify a separate fault involving the wred drop-profile threshold curve or attachment is incorrect. Its symptom is Tail drops occur abruptly rather than the expected early-drop progression. For this case the actual issue is per-customer shapers are configured without enforcing a proper aggregate parent limit, and the relevant success signal is Aggregate egress stays within the contracted parent rate and class priorities remain intact.

Question 391

A service provider configures hierarchical scheduling for customer traffic. Observed: Subinterfaces together exceed the parent shaping budget during congestion. What is the most likely source of the observed routing or service failure?

  1. Queue-specific congestion and scheduler weights hide localized buffer exhaustion.
  2. The WRED drop-profile threshold curve or attachment is incorrect.
  3. Per-customer shapers are configured without enforcing a proper aggregate parent limit.
  4. Classification does not assign distinct packet-loss priorities for drop behavior.

Explanation

Correct Answer

C:

This explanation is the closest match to the observed symptom: Subinterfaces together exceed the parent shaping budget during congestion. The specified root issue is Per-customer shapers are configured without enforcing a proper aggregate parent limit. Repair it through establish supported hierarchical scheduler and parent shaping policy, then check aggregate egress stays within the contracted parent rate and class priorities remain intact.

Incorrect Answers

A:

That explanation fits another condition: Application packet loss remains high even with low measured total interface utilization. The evidence here is Subinterfaces together exceed the parent shaping budget during congestion. Its closer root cause is Per-customer shapers are configured without enforcing a proper aggregate parent limit.

B:

The stated cause is possible elsewhere but explains tail drops occur abruptly rather than the expected early-drop progression, not subinterfaces together exceed the parent shaping budget during congestion. This incident is better attributed to per-customer shapers are configured without enforcing a proper aggregate parent limit.

D:

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: Subinterfaces together exceed the parent shaping budget during congestion. The likely cause is Per-customer shapers are configured without enforcing a proper aggregate parent limit.

Question 392

A service provider configures hierarchical scheduling for customer traffic. Observed: Subinterfaces together exceed the parent shaping budget during congestion. What operational check best guards against this problem returning?

  1. 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.
  2. 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.
  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 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.

Explanation

Correct Answer

D:

This control asks for the same recovery evidence (Aggregate egress stays within the contracted parent rate and class priorities remain intact) and flags recurrence of the same failure (Subinterfaces together exceed the parent shaping budget during congestion). It targets the underlying issue, per-customer shapers are configured without enforcing a proper aggregate parent limit, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

A:

This gate monitors a different failure, both important and disposable video packets are dropped equally in congestion. It would not detect the current problem: Subinterfaces together exceed the parent shaping budget during congestion. The appropriate check requires aggregate egress stays within the contracted parent rate and class priorities remain intact.

B:

The proposed control is tied to the wred drop-profile threshold curve or attachment is incorrect, typically observed when tail drops occur abruptly rather than the expected early-drop progression. Here the target is per-customer shapers are configured without enforcing a proper aggregate parent limit; monitor aggregate egress stays within the contracted parent rate and class priorities remain intact.

C:

It is valid for another service scenario but checks application packet loss remains high even with low measured total interface utilization. This case instead needs a gate for subinterfaces together exceed the parent shaping budget during congestion and evidence that aggregate egress stays within the contracted parent rate and class priorities remain intact.

Question 393

A video CDN uses two levels of packet loss priority. Observed: Both important and disposable video packets are dropped equally in congestion. Which targeted remediation is most appropriate for the observed condition?

  1. Separate packet-loss priority and apply compatible weighted random early drop profiles.
  2. Create supported low-latency treatment with suitable class classification and queue scheduling.
  3. Restore the intended multicast classification entry and corresponding scheduler.
  4. Restrict the matching filter term to the authorized customer or logical interface.

Explanation

Correct Answer

A:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—Both important and disposable video packets are dropped equally in congestion—is consistent with classification does not assign distinct packet-loss priorities for drop behavior. Use the specified correction, then verify: Congestion counters show preferential dropping of disposable packets. Preserve existing policy and tenant isolation.

Incorrect Answers

B:

This remediates no separate class queue protects delay-sensitive packets from serialization backlog, normally indicated by A single FIFO queue holds both low-latency and bulk data traffic. It would leave the observed problem (Both important and disposable video packets are dropped equally in congestion) unresolved. Address it with separate packet-loss priority and apply compatible weighted random early drop profiles.

C:

This change belongs to a different Class of Service (CoS) issue: Multicast video packets are assigned to the lowest-priority class after a classifier update. That issue involves the updated dscp-to-forwarding-class table misses the multicast source marking. The current symptom is Both important and disposable video packets are dropped equally in congestion. It instead requires separate packet-loss priority and apply compatible weighted random early drop profiles.

D:

The option may be useful when a broad policer reduces throughput for other tenants on the same interface, but that is not the current evidence. Here, both important and disposable video packets are dropped equally in congestion, indicating classification does not assign distinct packet-loss priorities for drop behavior. The targeted action is Separate packet-loss priority and apply compatible weighted random early drop profiles.

Question 394

A video CDN uses two levels of packet loss priority. Observed: Both important and disposable video packets are dropped equally in congestion. What evidence would validate recovery from this precise failure mode?

  1. Multicast packets land in the approved class and video impairment disappears.
  2. Congestion counters show preferential dropping of disposable packets.
  3. Only the target guest class is capped while unrelated tenants keep their service rate.
  4. Voice packets experience controlled latency while bulk traffic retains available capacity.

Explanation

Correct Answer

B:

The intended result is Congestion counters show preferential dropping of disposable packets. It specifically verifies recovery from classification does not assign distinct packet-loss priorities for drop behavior, which produced the original symptom: Both important and disposable video packets are dropped equally in congestion. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

It confirms an unrelated service correction: The updated DSCP-to-forwarding-class table misses the multicast source marking. The present case reports Both important and disposable video packets are dropped equally in congestion. Its completion test is Congestion counters show preferential dropping of disposable packets.

C:

That observation would verify a separate fault involving the policer was attached to a shared filter term rather than the customer's scoped traffic. Its symptom is A broad policer reduces throughput for other tenants on the same interface. For this case the actual issue is classification does not assign distinct packet-loss priorities for drop behavior, and the relevant success signal is Congestion counters show preferential dropping of disposable packets.

D:

This result is useful in another case with evidence A single FIFO queue holds both low-latency and bulk data traffic. It does not test recovery from both important and disposable video packets are dropped equally in congestion. Check instead whether congestion counters show preferential dropping of disposable packets.

Question 395

A video CDN uses two levels of packet loss priority. Observed: Both important and disposable video packets are dropped equally in congestion. What underlying protocol or service configuration problem best explains the evidence?

  1. Classification does not assign distinct packet-loss priorities for drop behavior.
  2. No separate class queue protects delay-sensitive packets from serialization backlog.
  3. The policer was attached to a shared filter term rather than the customer's scoped traffic.
  4. The updated DSCP-to-forwarding-class table misses the multicast source marking.

Explanation

Correct Answer

A:

Because both important and disposable video packets are dropped equally in congestion, the likely cause is classification does not assign distinct packet-loss priorities for drop behavior. It is testable: Separate packet-loss priority and apply compatible weighted random early drop profiles. Expected follow-up: Congestion counters show preferential dropping of disposable packets.

Incorrect Answers

B:

That explanation fits another condition: A single FIFO queue holds both low-latency and bulk data traffic. The evidence here is Both important and disposable video packets are dropped equally in congestion. Its closer root cause is Classification does not assign distinct packet-loss priorities for drop behavior.

C:

The stated cause is possible elsewhere but explains a broad policer reduces throughput for other tenants on the same interface, not both important and disposable video packets are dropped equally in congestion. This incident is better attributed to classification does not assign distinct packet-loss priorities for drop behavior.

D:

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

Question 396

A video CDN uses two levels of packet loss priority. Observed: Both important and disposable video packets are dropped equally in congestion. Which ongoing validation gate would best detect a recurrence of this problem?

  1. For each approved related change, verify that only the target guest class is capped while unrelated tenants keep their service rate. Flag recurrence if a broad policer reduces throughput for other tenants on the same interface.
  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

C:

A useful regression gate tests whether congestion counters show preferential dropping of disposable packets and alerts when both important and disposable video packets are dropped equally in congestion. This directly checks the technical weakness: Classification does not assign distinct packet-loss priorities for drop behavior. 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 the policer was attached to a shared filter term rather than the customer's scoped traffic, typically observed when a broad policer reduces throughput for other tenants on the same interface. Here the target is classification does not assign distinct packet-loss priorities for drop behavior; monitor congestion counters show preferential dropping of disposable packets.

B:

It is valid for another service scenario but checks a single fifo queue holds both low-latency and bulk data traffic. This case instead needs a gate for both important and disposable video packets are dropped equally in congestion and evidence that congestion counters show preferential dropping of disposable packets.

D:

This gate monitors a different failure, multicast video packets are assigned to the lowest-priority class after a classifier update. It would not detect the current problem: Both important and disposable video packets are dropped equally in congestion. The appropriate check requires congestion counters show preferential dropping of disposable packets.

Question 397

A provider intends to rate-limit one customer's guest Internet traffic. Observed: A broad policer reduces throughput for other tenants on the same interface. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Attach a coherent 802.1p rewrite policy for supported tagged egress frames.
  2. Move the rewrite policy to the actual egress logical interface with scoped review.
  3. Map ingress forwarding class to the intended MPLS traffic-class marking consistently.
  4. Restrict the matching filter term to the authorized customer or logical interface.

Explanation

Correct Answer

D:

The observed condition is A broad policer reduces throughput for other tenants on the same interface. That indicates the policer was attached to a shared filter term rather than the customer's scoped traffic. Applying the proposed remedy directly changes that condition. A concrete completion check is: Only the target guest class is capped while unrelated tenants keep their service rate.

Incorrect Answers

A:

This change belongs to a different Class of Service (CoS) issue: The 802.1p priority observed downstream no longer matches the agreed enterprise service class. That issue involves an egress ieee 802.1p rewrite map is absent or maps the wrong forwarding class. The current symptom is A broad policer reduces throughput for other tenants on the same interface. It instead requires restrict the matching filter term to the authorized customer or logical interface.

B:

The option may be useful when downstream peers see markings unchanged while reverse traffic is altered unexpectedly, but that is not the current evidence. Here, a broad policer reduces throughput for other tenants on the same interface, indicating the policer was attached to a shared filter term rather than the customer's scoped traffic. The targeted action is Restrict the matching filter term to the authorized customer or logical interface.

C:

This remediates ip classification was configured but mpls exp or traffic-class encoding was omitted, normally indicated by The core no longer preserves premium treatment across label-switched paths. It would leave the observed problem (A broad policer reduces throughput for other tenants on the same interface) unresolved. Address it with restrict the matching filter term to the authorized customer or logical interface.

Question 398

A provider intends to rate-limit one customer's guest Internet traffic. Observed: A broad policer reduces throughput for other tenants on the same interface. After the correction, which result would most convincingly show that this fault is resolved?

  1. Downstream tag captures show the intended priority codepoint values.
  2. Only the target guest class is capped while unrelated tenants keep their service rate.
  3. Test packets on intended egress show correct markings and reverse traffic remains unchanged.
  4. Core label captures and queue counters show the intended premium treatment.

Explanation

Correct Answer

B:

After restrict the matching filter term to the authorized customer or logical interface, inspect whether only the target guest class is capped while unrelated tenants keep their service rate. This closes the loop between the reported observation (A broad policer reduces throughput for other tenants on the same interface) and the underlying issue (The policer was attached to a shared filter term rather than the customer's scoped traffic).

Incorrect Answers

A:

It confirms an unrelated service correction: An egress IEEE 802.1p rewrite map is absent or maps the wrong forwarding class. The present case reports A broad policer reduces throughput for other tenants on the same interface. Its completion test is Only the target guest class is capped while unrelated tenants keep their service rate.

C:

That observation would verify a separate fault involving the rewrite rule was bound to an interface with the wrong outbound direction. Its symptom is Downstream peers see markings unchanged while reverse traffic is altered unexpectedly. For this case the actual issue is the policer was attached to a shared filter term rather than the customer's scoped traffic, and the relevant success signal is Only the target guest class is capped while unrelated tenants keep their service rate.

D:

This result is useful in another case with evidence The core no longer preserves premium treatment across label-switched paths. It does not test recovery from a broad policer reduces throughput for other tenants on the same interface. Check instead whether only the target guest class is capped while unrelated tenants keep their service rate.

Question 399

A provider intends to rate-limit one customer's guest Internet traffic. Observed: A broad policer reduces throughput for other tenants on the same interface. Which root cause is most consistent with this symptom?

  1. IP classification was configured but MPLS EXP or traffic-class encoding was omitted.
  2. An egress IEEE 802.1p rewrite map is absent or maps the wrong forwarding class.
  3. The policer was attached to a shared filter term rather than the customer's scoped traffic.
  4. The rewrite rule was bound to an interface with the wrong outbound direction.

Explanation

Correct Answer

C:

The reported evidence—A broad policer reduces throughput for other tenants on the same interface—supports the policer was attached to a shared filter term rather than the customer's scoped traffic. The appropriate intervention is to restrict the matching filter term to the authorized customer or logical interface, with confirmation from only the target guest class is capped while unrelated tenants keep their service rate. Other causes require actual device-state verification.

Incorrect Answers

A:

That explanation fits another condition: The core no longer preserves premium treatment across label-switched paths. The evidence here is A broad policer reduces throughput for other tenants on the same interface. Its closer root cause is The policer was attached to a shared filter term rather than the customer's scoped traffic.

B:

An egress IEEE 802.1p rewrite map is absent or maps the wrong forwarding class. would normally be accompanied by the 802.1p priority observed downstream no longer matches the agreed enterprise service class. The observed symptom is different: A broad policer reduces throughput for other tenants on the same interface. The likely cause is The policer was attached to a shared filter term rather than the customer's scoped traffic.

D:

The stated cause is possible elsewhere but explains downstream peers see markings unchanged while reverse traffic is altered unexpectedly, not a broad policer reduces throughput for other tenants on the same interface. This incident is better attributed to the policer was attached to a shared filter term rather than the customer's scoped traffic.

Question 400

A provider intends to rate-limit one customer's guest Internet traffic. Observed: A broad policer reduces throughput for other tenants on the same interface. 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 core label captures and queue counters show the intended premium treatment. Flag recurrence if the core no longer preserves premium treatment across label-switched paths.
  3. For each approved related change, verify that downstream tag captures show the intended priority codepoint values. Flag recurrence if the 802.1p priority observed downstream no longer matches the agreed enterprise service class.
  4. For each approved related change, verify that only the target guest class is capped while unrelated tenants keep their service rate. Flag recurrence if a broad policer reduces throughput for other tenants on the same interface.

Explanation

Correct Answer

D:

The control is specific to the initial failure. It requires the result Only the target guest class is capped while unrelated tenants keep their service rate. and treats A broad policer reduces throughput for other tenants on the same interface. as a failure signal. The causal concern is the policer was attached to a shared filter term rather than the customer's scoped traffic.

Incorrect Answers

A:

The proposed control is tied to the rewrite rule was bound to an interface with the wrong outbound direction, typically observed when downstream peers see markings unchanged while reverse traffic is altered unexpectedly. Here the target is the policer was attached to a shared filter term rather than the customer's scoped traffic; monitor only the target guest class is capped while unrelated tenants keep their service rate.

B:

It is valid for another service scenario but checks the core no longer preserves premium treatment across label-switched paths. This case instead needs a gate for a broad policer reduces throughput for other tenants on the same interface and evidence that only the target guest class is capped while unrelated tenants keep their service rate.

C:

This gate monitors a different failure, the 802.1p priority observed downstream no longer matches the agreed enterprise service class. It would not detect the current problem: A broad policer reduces throughput for other tenants on the same interface. The appropriate check requires only the target guest class is capped while unrelated tenants keep their service rate.

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