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

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Juniper JN0-664 Practice Test 41

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.

Question 401

An MPLS core receives traffic with IP DSCP markings at the PE. Observed: The core no longer preserves premium treatment across label-switched paths. What should the routing engineer change first to address this particular symptom?

  1. Apply equivalent scoped classification filters to both intended ingress interfaces.
  2. Define compatible ingress MPLS traffic-class classification for the peer contract.
  3. Map ingress forwarding class to the intended MPLS traffic-class marking consistently.
  4. Classify approved voice flows into a suitable forwarding class and assign a protected scheduler.

Explanation

Correct Answer

C:

The decisive evidence is that The core no longer preserves premium treatment across label-switched paths. This follows from ip classification was configured but mpls exp or traffic-class encoding was omitted. The focused remedy is to map ingress forwarding class to the intended MPLS traffic-class marking consistently. Confirm improvement when core label captures and queue counters show the intended premium treatment. Validate on an approved lab or change window before touching production.

Incorrect Answers

A:

The option may be useful when traffic is classified correctly only on one interface even though both see identical flows, but that is not the current evidence. Here, the core no longer preserves premium treatment across label-switched paths, indicating ip classification was configured but mpls exp or traffic-class encoding was omitted. The targeted action is Map ingress forwarding class to the intended MPLS traffic-class marking consistently.

B:

This change belongs to a different Class of Service (CoS) issue: Premium traffic is delivered as best effort because the incoming label class is not decoded. That issue involves the ingress exp classifier does not map provider labels to local forwarding classes. The current symptom is The core no longer preserves premium treatment across label-switched paths. It instead requires map ingress forwarding class to the intended MPLS traffic-class marking consistently.

D:

This remediates the default forwarding class treats latency-sensitive voice like best-effort traffic, normally indicated by Voice jitter rises during backup bursts although interface errors are zero. It would leave the observed problem (The core no longer preserves premium treatment across label-switched paths) unresolved. Address it with map ingress forwarding class to the intended MPLS traffic-class marking consistently.

Question 402

An MPLS core receives traffic with IP DSCP markings at the PE. Observed: The core no longer preserves premium treatment across label-switched paths. Which acceptance observation best confirms that the proposed change worked?

  1. Premium label values map to the correct internal class and egress scheduler.
  2. Voice delay and jitter stay within the service objective during measured backup load.
  3. Matching application flows receive the same forwarding class regardless of incoming port.
  4. Core label captures and queue counters show the intended premium treatment.

Explanation

Correct Answer

D:

This acceptance criterion tests the actual fault. The source evidence was The core no longer preserves premium treatment across label-switched paths. The correction addresses ip classification was configured but mpls exp or traffic-class encoding was omitted; success requires core label captures and queue counters show the intended premium treatment.

Incorrect Answers

A:

It confirms an unrelated service correction: The ingress EXP classifier does not map provider labels to local forwarding classes. The present case reports The core no longer preserves premium treatment across label-switched paths. Its completion test is Core label captures and queue counters show the intended premium treatment.

B:

This result is useful in another case with evidence Voice jitter rises during backup bursts although interface errors are zero. It does not test recovery from the core no longer preserves premium treatment across label-switched paths. Check instead whether core label captures and queue counters show the intended premium treatment.

C:

That observation would verify a separate fault involving the firewall filter class action is attached on one ingress path but not the other. Its symptom is Traffic is classified correctly only on one interface even though both see identical flows. For this case the actual issue is ip classification was configured but mpls exp or traffic-class encoding was omitted, and the relevant success signal is Core label captures and queue counters show the intended premium treatment.

Question 403

An MPLS core receives traffic with IP DSCP markings at the PE. Observed: The core no longer preserves premium treatment across label-switched paths. What is the most likely source of the observed routing or service failure?

  1. The default forwarding class treats latency-sensitive voice like best-effort traffic.
  2. The ingress EXP classifier does not map provider labels to local forwarding classes.
  3. IP classification was configured but MPLS EXP or traffic-class encoding was omitted.
  4. The firewall filter class action is attached on one ingress path but not the other.

Explanation

Correct Answer

C:

This explanation is the closest match to the observed symptom: The core no longer preserves premium treatment across label-switched paths. The specified root issue is IP classification was configured but MPLS EXP or traffic-class encoding was omitted. Repair it through map ingress forwarding class to the intended MPLS traffic-class marking consistently, then check core label captures and queue counters show the intended premium treatment.

Incorrect Answers

A:

That explanation fits another condition: Voice jitter rises during backup bursts although interface errors are zero. The evidence here is The core no longer preserves premium treatment across label-switched paths. Its closer root cause is IP classification was configured but MPLS EXP or traffic-class encoding was omitted.

B:

The ingress EXP classifier does not map provider labels to local forwarding classes. would normally be accompanied by premium traffic is delivered as best effort because the incoming label class is not decoded. The observed symptom is different: The core no longer preserves premium treatment across label-switched paths. The likely cause is IP classification was configured but MPLS EXP or traffic-class encoding was omitted.

D:

The stated cause is possible elsewhere but explains traffic is classified correctly only on one interface even though both see identical flows, not the core no longer preserves premium treatment across label-switched paths. This incident is better attributed to ip classification was configured but mpls exp or traffic-class encoding was omitted.

Question 404

An MPLS core receives traffic with IP DSCP markings at the PE. Observed: The core no longer preserves premium treatment across label-switched paths. What operational check best guards against this problem returning?

  1. For each approved related change, verify that voice delay and jitter stay within the service objective during measured backup load. Flag recurrence if voice jitter rises during backup bursts although interface errors are zero.
  2. For each approved related change, verify that matching application flows receive the same forwarding class regardless of incoming port. Flag recurrence if traffic is classified correctly only on one interface even though both see identical flows.
  3. For each approved related change, verify that premium label values map to the correct internal class and egress scheduler. Flag recurrence if premium traffic is delivered as best effort because the incoming label class is not decoded.
  4. 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.

Explanation

Correct Answer

D:

This control asks for the same recovery evidence (Core label captures and queue counters show the intended premium treatment) and flags recurrence of the same failure (The core no longer preserves premium treatment across label-switched paths). It targets the underlying issue, ip classification was configured but mpls exp or traffic-class encoding was omitted, 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 voice jitter rises during backup bursts although interface errors are zero. This case instead needs a gate for the core no longer preserves premium treatment across label-switched paths and evidence that core label captures and queue counters show the intended premium treatment.

B:

The proposed control is tied to the firewall filter class action is attached on one ingress path but not the other, typically observed when traffic is classified correctly only on one interface even though both see identical flows. Here the target is ip classification was configured but mpls exp or traffic-class encoding was omitted; monitor core label captures and queue counters show the intended premium treatment.

C:

This gate monitors a different failure, premium traffic is delivered as best effort because the incoming label class is not decoded. It would not detect the current problem: The core no longer preserves premium treatment across label-switched paths. The appropriate check requires core label captures and queue counters show the intended premium treatment.

Question 405

A transit router imports MPLS packets from another provider. Observed: Premium traffic is delivered as best effort because the incoming label class is not decoded. Which targeted remediation is most appropriate for the observed condition?

  1. Apply the correct DSCP classification mapping on the ingress logical interface.
  2. Set the intended loss priority in the classifier or firewall filter actions.
  3. Limit the high-priority offered rate and use appropriate scheduling for the remaining classes.
  4. Define compatible ingress MPLS traffic-class classification for the peer contract.

Explanation

Correct Answer

D:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—Premium traffic is delivered as best effort because the incoming label class is not decoded—is consistent with the ingress exp classifier does not map provider labels to local forwarding classes. Use the specified correction, then verify: Premium label values map to the correct internal class and egress scheduler. Preserve existing policy and tenant isolation.

Incorrect Answers

A:

This change belongs to a different Class of Service (CoS) issue: Traffic with a valid voice DSCP enters the default best-effort queue. That issue involves a dscp classifier is not bound to the ingress traffic interface. The current symptom is Premium traffic is delivered as best effort because the incoming label class is not decoded. It instead requires define compatible ingress MPLS traffic-class classification for the peer contract.

B:

This remediates the policy sets a forwarding class but omits the packet-loss priority action, normally indicated by Policer counters rise but the wrong loss-priority bit is set internally. It would leave the observed problem (Premium traffic is delivered as best effort because the incoming label class is not decoded) unresolved. Address it with define compatible ingress MPLS traffic-class classification for the peer contract.

C:

The option may be useful when other business queues starve whenever monitoring traffic floods, but that is not the current evidence. Here, premium traffic is delivered as best effort because the incoming label class is not decoded, indicating the ingress exp classifier does not map provider labels to local forwarding classes. The targeted action is Define compatible ingress MPLS traffic-class classification for the peer contract.

Question 406

A transit router imports MPLS packets from another provider. Observed: Premium traffic is delivered as best effort because the incoming label class is not decoded. What evidence would validate recovery from this precise failure mode?

  1. Counters show voice packets in the intended forwarding class before egress scheduling.
  2. Critical monitoring meets latency objectives while business queues retain guaranteed service.
  3. Premium label values map to the correct internal class and egress scheduler.
  4. Internal class and loss-priority counters match the policy for each sample flow.

Explanation

Correct Answer

C:

The intended result is Premium label values map to the correct internal class and egress scheduler. It specifically verifies recovery from the ingress exp classifier does not map provider labels to local forwarding classes, which produced the original symptom: Premium traffic is delivered as best effort because the incoming label class is not decoded. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

It confirms an unrelated service correction: A DSCP classifier is not bound to the ingress traffic interface. The present case reports Premium traffic is delivered as best effort because the incoming label class is not decoded. Its completion test is Premium label values map to the correct internal class and egress scheduler.

B:

That observation would verify a separate fault involving a strict-priority queue has no effective cap or rate control. Its symptom is Other business queues starve whenever monitoring traffic floods. For this case the actual issue is the ingress exp classifier does not map provider labels to local forwarding classes, and the relevant success signal is Premium label values map to the correct internal class and egress scheduler.

D:

This result is useful in another case with evidence Policer counters rise but the wrong loss-priority bit is set internally. It does not test recovery from premium traffic is delivered as best effort because the incoming label class is not decoded. Check instead whether premium label values map to the correct internal class and egress scheduler.

Question 407

A transit router imports MPLS packets from another provider. Observed: Premium traffic is delivered as best effort because the incoming label class is not decoded. What underlying protocol or service configuration problem best explains the evidence?

  1. A strict-priority queue has no effective cap or rate control.
  2. The policy sets a forwarding class but omits the packet-loss priority action.
  3. The ingress EXP classifier does not map provider labels to local forwarding classes.
  4. A DSCP classifier is not bound to the ingress traffic interface.

Explanation

Correct Answer

C:

Because premium traffic is delivered as best effort because the incoming label class is not decoded, the likely cause is the ingress exp classifier does not map provider labels to local forwarding classes. It is testable: Define compatible ingress MPLS traffic-class classification for the peer contract. Expected follow-up: Premium label values map to the correct internal class and egress scheduler.

Incorrect Answers

A:

The stated cause is possible elsewhere but explains other business queues starve whenever monitoring traffic floods, not premium traffic is delivered as best effort because the incoming label class is not decoded. This incident is better attributed to the ingress exp classifier does not map provider labels to local forwarding classes.

B:

That explanation fits another condition: Policer counters rise but the wrong loss-priority bit is set internally. The evidence here is Premium traffic is delivered as best effort because the incoming label class is not decoded. Its closer root cause is The ingress EXP classifier does not map provider labels to local forwarding classes.

D:

A DSCP classifier is not bound to the ingress traffic interface. would normally be accompanied by traffic with a valid voice dscp enters the default best-effort queue. The observed symptom is different: Premium traffic is delivered as best effort because the incoming label class is not decoded. The likely cause is The ingress EXP classifier does not map provider labels to local forwarding classes.

Question 408

A transit router imports MPLS packets from another provider. Observed: Premium traffic is delivered as best effort because the incoming label class is not decoded. Which ongoing validation gate would best detect a recurrence of this problem?

  1. For each approved related change, verify that premium label values map to the correct internal class and egress scheduler. Flag recurrence if premium traffic is delivered as best effort because the incoming label class is not decoded.
  2. For each approved related change, verify that counters show voice packets in the intended forwarding class before egress scheduling. Flag recurrence if traffic with a valid voice DSCP enters the default best-effort queue.
  3. For each approved related change, verify that critical monitoring meets latency objectives while business queues retain guaranteed service. Flag recurrence if other business queues starve whenever monitoring traffic floods.
  4. For each approved related change, verify that internal class and loss-priority counters match the policy for each sample flow. Flag recurrence if policer counters rise but the wrong loss-priority bit is set internally.

Explanation

Correct Answer

A:

A useful regression gate tests whether premium label values map to the correct internal class and egress scheduler and alerts when premium traffic is delivered as best effort because the incoming label class is not decoded. This directly checks the technical weakness: The ingress EXP classifier does not map provider labels to local forwarding classes. 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, traffic with a valid voice dscp enters the default best-effort queue. It would not detect the current problem: Premium traffic is delivered as best effort because the incoming label class is not decoded. The appropriate check requires premium label values map to the correct internal class and egress scheduler.

C:

The proposed control is tied to a strict-priority queue has no effective cap or rate control, typically observed when other business queues starve whenever monitoring traffic floods. Here the target is the ingress exp classifier does not map provider labels to local forwarding classes; monitor premium label values map to the correct internal class and egress scheduler.

D:

It is valid for another service scenario but checks policer counters rise but the wrong loss-priority bit is set internally. This case instead needs a gate for premium traffic is delivered as best effort because the incoming label class is not decoded and evidence that premium label values map to the correct internal class and egress scheduler.

Question 409

A service interface uses strict-high priority for a monitoring class. Observed: Other business queues starve whenever monitoring traffic floods. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Limit the high-priority offered rate and use appropriate scheduling for the remaining classes.
  2. Validate the shaping rate and supported overhead accounting against the contracted service.
  3. Assign the correct per-customer scheduler profile and respect parent capacity.
  4. Define and attach an authorized DSCP rewrite rule on the egress side.

Explanation

Correct Answer

A:

The observed condition is Other business queues starve whenever monitoring traffic floods. That indicates a strict-priority queue has no effective cap or rate control. Applying the proposed remedy directly changes that condition. A concrete completion check is: Critical monitoring meets latency objectives while business queues retain guaranteed service.

Incorrect Answers

B:

This remediates the shaping policy ignores link framing and encapsulation overhead assumptions, normally indicated by Egress utilization consistently exceeds the expected data rate when frame overhead is included. It would leave the observed problem (Other business queues starve whenever monitoring traffic floods) unresolved. Address it with limit the high-priority offered rate and use appropriate scheduling for the remaining classes.

C:

This change belongs to a different Class of Service (CoS) issue: A new customer receives the same bandwidth guarantee as the largest existing customer. That issue involves tenant-facing scheduler profiles were copied without evaluating each contracted committed rate. The current symptom is Other business queues starve whenever monitoring traffic floods. It instead requires limit the high-priority offered rate and use appropriate scheduling for the remaining classes.

D:

The option may be useful when packets leave the WAN interface with DSCP zero despite correct internal classification, but that is not the current evidence. Here, other business queues starve whenever monitoring traffic floods, indicating a strict-priority queue has no effective cap or rate control. The targeted action is Limit the high-priority offered rate and use appropriate scheduling for the remaining classes.

Question 410

A service interface uses strict-high priority for a monitoring class. Observed: Other business queues starve whenever monitoring traffic floods. After the correction, which result would most convincingly show that this fault is resolved?

  1. Captured outgoing frames retain the contracted DSCP markings.
  2. Measured per-customer service rates match the individual contracts under shared load.
  3. Critical monitoring meets latency objectives while business queues retain guaranteed service.
  4. Measured wire-rate remains inside the agreed SLA under saturated load.

Explanation

Correct Answer

C:

After limit the high-priority offered rate and use appropriate scheduling for the remaining classes, inspect whether critical monitoring meets latency objectives while business queues retain guaranteed service. This closes the loop between the reported observation (Other business queues starve whenever monitoring traffic floods) and the underlying issue (A strict-priority queue has no effective cap or rate control).

Incorrect Answers

A:

That observation would verify a separate fault involving the egress rewrite rule does not map forwarding class and loss priority to the agreed codepoint. Its symptom is Packets leave the WAN interface with DSCP zero despite correct internal classification. For this case the actual issue is a strict-priority queue has no effective cap or rate control, and the relevant success signal is Critical monitoring meets latency objectives while business queues retain guaranteed service.

B:

It confirms an unrelated service correction: Tenant-facing scheduler profiles were copied without evaluating each contracted committed rate. The present case reports Other business queues starve whenever monitoring traffic floods. Its completion test is Critical monitoring meets latency objectives while business queues retain guaranteed service.

D:

This result is useful in another case with evidence Egress utilization consistently exceeds the expected data rate when frame overhead is included. It does not test recovery from other business queues starve whenever monitoring traffic floods. Check instead whether critical monitoring meets latency objectives while business queues retain guaranteed service.

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