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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 39

Question 380

A provider delivers a business VPN with negotiated expedited traffic. Observed: Packets leave the WAN interface with DSCP zero despite correct internal classification. What operational check best guards against this problem returning?

  1. For each approved related change, verify that premium queue loss stays bounded while low-priority bursts are controlled. Flag recurrence if the premium application suffers sustained loss before any low-priority flow is dropped.
  2. For each approved related change, verify that captured outgoing frames retain the contracted DSCP markings. Flag recurrence if packets leave the WAN interface with DSCP zero despite correct internal classification.
  3. For each approved related change, verify that measured per-customer service rates match the individual contracts under shared load. Flag recurrence if a new customer receives the same bandwidth guarantee as the largest existing customer.
  4. 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.

Explanation

Correct Answer

B:

This control asks for the same recovery evidence (Captured outgoing frames retain the contracted DSCP markings) and flags recurrence of the same failure (Packets leave the WAN interface with DSCP zero despite correct internal classification). It targets the underlying issue, the egress rewrite rule does not map forwarding class and loss priority to the agreed codepoint, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

A:

This gate monitors a different failure, the premium application suffers sustained loss before any low-priority flow is dropped. It would not detect the current problem: Packets leave the WAN interface with DSCP zero despite correct internal classification. The appropriate check requires captured outgoing frames retain the contracted DSCP markings.

C:

It is valid for another service scenario but checks a new customer receives the same bandwidth guarantee as the largest existing customer. This case instead needs a gate for packets leave the wan interface with dscp zero despite correct internal classification and evidence that captured outgoing frames retain the contracted DSCP markings.

D:

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 egress rewrite rule does not map forwarding class and loss priority to the agreed codepoint; monitor captured outgoing frames retain the contracted DSCP markings.

Question 381

A core uplink experiences bursts from multiple low-priority tenants. Observed: The premium application suffers sustained loss before any low-priority flow is dropped. Which targeted remediation is most appropriate for the observed condition?

  1. Correct the firewall filter policer association and verify units and burst allowance.
  2. Align class preservation and rewrite behavior at the MPLS/IP boundary.
  3. Assign priority and bandwidth guarantees aligned with measured class demand and loss objectives.
  4. Validate the shaping rate and supported overhead accounting against the contracted service.

Explanation

Correct Answer

C:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—The premium application suffers sustained loss before any low-priority flow is dropped—is consistent with egress queue weights and scheduler priorities conflict with the sla. Use the specified correction, then verify: Premium queue loss stays bounded while low-priority bursts are controlled. Preserve existing policy and tenant isolation.

Incorrect Answers

A:

The option may be useful when business telemetry is discarded even when its contracted rate is not exceeded, but that is not the current evidence. Here, the premium application suffers sustained loss before any low-priority flow is dropped, indicating egress queue weights and scheduler priorities conflict with the sla. The targeted action is Assign priority and bandwidth guarantees aligned with measured class demand and loss objectives.

B:

This change belongs to a different Class of Service (CoS) issue: DSCP-based priority is lost after penultimate-hop processing. That issue involves mpls-to-ip class mapping at label pop or egress pe is inconsistent. The current symptom is The premium application suffers sustained loss before any low-priority flow is dropped. It instead requires assign priority and bandwidth guarantees aligned with measured class demand and loss objectives.

D:

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 (The premium application suffers sustained loss before any low-priority flow is dropped) unresolved. Address it with assign priority and bandwidth guarantees aligned with measured class demand and loss objectives.

Question 382

A core uplink experiences bursts from multiple low-priority tenants. Observed: The premium application suffers sustained loss before any low-priority flow is dropped. What evidence would validate recovery from this precise failure mode?

  1. Premium queue loss stays bounded while low-priority bursts are controlled.
  2. Measured wire-rate remains inside the agreed SLA under saturated load.
  3. The service retains agreed CoS marks and priority from ingress to customer-facing egress.
  4. In-profile traffic passes and only true excess traffic is policed.

Explanation

Correct Answer

A:

The intended result is Premium queue loss stays bounded while low-priority bursts are controlled. It specifically verifies recovery from egress queue weights and scheduler priorities conflict with the sla, which produced the original symptom: The premium application suffers sustained loss before any low-priority flow is dropped. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

B:

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 the premium application suffers sustained loss before any low-priority flow is dropped. Check instead whether premium queue loss stays bounded while low-priority bursts are controlled.

C:

It confirms an unrelated service correction: MPLS-to-IP class mapping at label pop or egress PE is inconsistent. The present case reports The premium application suffers sustained loss before any low-priority flow is dropped. Its completion test is Premium queue loss stays bounded while low-priority bursts are controlled.

D:

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 egress queue weights and scheduler priorities conflict with the sla, and the relevant success signal is Premium queue loss stays bounded while low-priority bursts are controlled.

Question 383

A core uplink experiences bursts from multiple low-priority tenants. Observed: The premium application suffers sustained loss before any low-priority flow is dropped. What underlying protocol or service configuration problem best explains the evidence?

  1. Egress queue weights and scheduler priorities conflict with the SLA.
  2. The shaping policy ignores link framing and encapsulation overhead assumptions.
  3. The policer match or bandwidth unit differs from the intended traffic contract.
  4. MPLS-to-IP class mapping at label pop or egress PE is inconsistent.

Explanation

Correct Answer

A:

Because the premium application suffers sustained loss before any low-priority flow is dropped, the likely cause is egress queue weights and scheduler priorities conflict with the sla. It is testable: Assign priority and bandwidth guarantees aligned with measured class demand and loss objectives. Expected follow-up: Premium queue loss stays bounded while low-priority bursts are controlled.

Incorrect Answers

B:

That explanation fits another condition: Egress utilization consistently exceeds the expected data rate when frame overhead is included. The evidence here is The premium application suffers sustained loss before any low-priority flow is dropped. Its closer root cause is Egress queue weights and scheduler priorities conflict with the SLA.

C:

The stated cause is possible elsewhere but explains business telemetry is discarded even when its contracted rate is not exceeded, not the premium application suffers sustained loss before any low-priority flow is dropped. This incident is better attributed to egress queue weights and scheduler priorities conflict with the sla.

D:

MPLS-to-IP class mapping at label pop or egress PE is inconsistent. would normally be accompanied by dscp-based priority is lost after penultimate-hop processing. The observed symptom is different: The premium application suffers sustained loss before any low-priority flow is dropped. The likely cause is Egress queue weights and scheduler priorities conflict with the SLA.

Question 384

A core uplink experiences bursts from multiple low-priority tenants. Observed: The premium application suffers sustained loss before any low-priority flow is dropped. Which ongoing validation gate would best detect a recurrence of this problem?

  1. For each approved related change, verify that measured wire-rate remains inside the agreed SLA under saturated load. Flag recurrence if egress utilization consistently exceeds the expected data rate when frame overhead is included.
  2. 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.
  3. For each approved related change, verify that premium queue loss stays bounded while low-priority bursts are controlled. Flag recurrence if the premium application suffers sustained loss before any low-priority flow is dropped.
  4. For each approved related change, verify that the service retains agreed CoS marks and priority from ingress to customer-facing egress. Flag recurrence if dSCP-based priority is lost after penultimate-hop processing.

Explanation

Correct Answer

C:

A useful regression gate tests whether premium queue loss stays bounded while low-priority bursts are controlled and alerts when the premium application suffers sustained loss before any low-priority flow is dropped. This directly checks the technical weakness: Egress queue weights and scheduler priorities conflict with the SLA. 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 egress utilization consistently exceeds the expected data rate when frame overhead is included. This case instead needs a gate for the premium application suffers sustained loss before any low-priority flow is dropped and evidence that premium queue loss stays bounded while low-priority bursts are controlled.

B:

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 egress queue weights and scheduler priorities conflict with the sla; monitor premium queue loss stays bounded while low-priority bursts are controlled.

D:

This gate monitors a different failure, dscp-based priority is lost after penultimate-hop processing. It would not detect the current problem: The premium application suffers sustained loss before any low-priority flow is dropped. The appropriate check requires premium queue loss stays bounded while low-priority bursts are controlled.

Question 385

An interface has a limited-capacity policer attached to the wrong class. Observed: Business telemetry is discarded even when its contracted rate is not exceeded. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Establish supported hierarchical scheduler and parent shaping policy.
  2. Correct the firewall filter policer association and verify units and burst allowance.
  3. Implement scoped control-plane protection and scheduler allocation without unbounded starvation.
  4. Align ingress classification with the active VPN traffic identifier and scheduler map.

Explanation

Correct Answer

B:

The observed condition is Business telemetry is discarded even when its contracted rate is not exceeded. That indicates the policer match or bandwidth unit differs from the intended traffic contract. Applying the proposed remedy directly changes that condition. A concrete completion check is: In-profile traffic passes and only true excess traffic is policed.

Incorrect Answers

A:

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 (Business telemetry is discarded even when its contracted rate is not exceeded) unresolved. Address it with correct the firewall filter policer association and verify units and burst allowance.

C:

The option may be useful when bGP keepalives are delayed under volumetric guest transit load, but that is not the current evidence. Here, business telemetry is discarded even when its contracted rate is not exceeded, indicating the policer match or bandwidth unit differs from the intended traffic contract. The targeted action is Correct the firewall filter policer association and verify units and burst allowance.

D:

This change belongs to a different Class of Service (CoS) issue: VPN queue counters show no packets despite known VPN load. That issue involves classifier and forwarding-class mappings do not match the chosen vpn traffic selector. The current symptom is Business telemetry is discarded even when its contracted rate is not exceeded. It instead requires correct the firewall filter policer association and verify units and burst allowance.

Question 386

An interface has a limited-capacity policer attached to the wrong class. Observed: Business telemetry is discarded even when its contracted rate is not exceeded. After the correction, which result would most convincingly show that this fault is resolved?

  1. Aggregate egress stays within the contracted parent rate and class priorities remain intact.
  2. VPN packets increment the intended queue counters and receive the agreed service.
  3. In-profile traffic passes and only true excess traffic is policed.
  4. Routing sessions remain healthy while excess guest traffic is rate-limited.

Explanation

Correct Answer

C:

After correct the firewall filter policer association and verify units and burst allowance, inspect whether in-profile traffic passes and only true excess traffic is policed. This closes the loop between the reported observation (Business telemetry is discarded even when its contracted rate is not exceeded) and the underlying issue (The policer match or bandwidth unit differs from the intended traffic contract).

Incorrect Answers

A:

This result is useful in another case with evidence Subinterfaces together exceed the parent shaping budget during congestion. It does not test recovery from business telemetry is discarded even when its contracted rate is not exceeded. Check instead whether in-profile traffic passes and only true excess traffic is policed.

B:

It confirms an unrelated service correction: Classifier and forwarding-class mappings do not match the chosen VPN traffic selector. The present case reports Business telemetry is discarded even when its contracted rate is not exceeded. Its completion test is In-profile traffic passes and only true excess traffic is policed.

D:

That observation would verify a separate fault involving control-plane class lacks rate and priority protection in the congestion policy. Its symptom is BGP keepalives are delayed under volumetric guest transit load. For this case the actual issue is the policer match or bandwidth unit differs from the intended traffic contract, and the relevant success signal is In-profile traffic passes and only true excess traffic is policed.

Question 387

An interface has a limited-capacity policer attached to the wrong class. Observed: Business telemetry is discarded even when its contracted rate is not exceeded. Which root cause is most consistent with this symptom?

  1. Per-customer shapers are configured without enforcing a proper aggregate parent limit.
  2. Control-plane class lacks rate and priority protection in the congestion policy.
  3. Classifier and forwarding-class mappings do not match the chosen VPN traffic selector.
  4. The policer match or bandwidth unit differs from the intended traffic contract.

Explanation

Correct Answer

D:

The reported evidence—Business telemetry is discarded even when its contracted rate is not exceeded—supports the policer match or bandwidth unit differs from the intended traffic contract. The appropriate intervention is to correct the firewall filter policer association and verify units and burst allowance, with confirmation from in-profile traffic passes and only true excess traffic is policed. Other causes require actual device-state verification.

Incorrect Answers

A:

That explanation fits another condition: Subinterfaces together exceed the parent shaping budget during congestion. The evidence here is Business telemetry is discarded even when its contracted rate is not exceeded. Its closer root cause is The policer match or bandwidth unit differs from the intended traffic contract.

B:

The stated cause is possible elsewhere but explains bgp keepalives are delayed under volumetric guest transit load, not business telemetry is discarded even when its contracted rate is not exceeded. This incident is better attributed to the policer match or bandwidth unit differs from the intended traffic contract.

C:

Classifier and forwarding-class mappings do not match the chosen VPN traffic selector. would normally be accompanied by vpn queue counters show no packets despite known vpn load. The observed symptom is different: Business telemetry is discarded even when its contracted rate is not exceeded. The likely cause is The policer match or bandwidth unit differs from the intended traffic contract.

Question 388

An interface has a limited-capacity policer attached to the wrong class. Observed: Business telemetry is discarded even when its contracted rate is not exceeded. Which change-acceptance control is most relevant to preventing this exact failure?

  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 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.
  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

B:

The control is specific to the initial failure. It requires the result In-profile traffic passes and only true excess traffic is policed. and treats Business telemetry is discarded even when its contracted rate is not exceeded. as a failure signal. The causal concern is the policer match or bandwidth unit differs from the intended traffic contract.

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 business telemetry is discarded even when its contracted rate is not exceeded and evidence that in-profile traffic passes and only true excess traffic is policed.

C:

The proposed control is tied to control-plane class lacks rate and priority protection in the congestion policy, typically observed when bGP keepalives are delayed under volumetric guest transit load. Here the target is the policer match or bandwidth unit differs from the intended traffic contract; monitor in-profile traffic passes and only true excess traffic is policed.

D:

This gate monitors a different failure, vpn queue counters show no packets despite known vpn load. It would not detect the current problem: Business telemetry is discarded even when its contracted rate is not exceeded. The appropriate check requires in-profile traffic passes and only true excess traffic is policed.

Question 389

A service provider configures hierarchical scheduling for customer traffic. Observed: Subinterfaces together exceed the parent shaping budget during congestion. What should the routing engineer change first to address this particular symptom?

  1. Review average queue depth thresholds and attach the intended drop profile to the proper scheduler.
  2. Separate packet-loss priority and apply compatible weighted random early drop profiles.
  3. Establish supported hierarchical scheduler and parent shaping policy.
  4. Inspect per-queue offered rate and adjust guarantees and drop settings to actual demand.

Explanation

Correct Answer

C:

The decisive evidence is that Subinterfaces together exceed the parent shaping budget during congestion. This follows from per-customer shapers are configured without enforcing a proper aggregate parent limit. The focused remedy is to establish supported hierarchical scheduler and parent shaping policy. Confirm improvement when aggregate egress stays within the contracted parent rate and class priorities remain intact. Validate on an approved lab or change window before touching production.

Incorrect Answers

A:

The option may be useful when tail drops occur abruptly rather than the expected early-drop progression, but that is not the current evidence. Here, subinterfaces together exceed the parent shaping budget during congestion, indicating per-customer shapers are configured without enforcing a proper aggregate parent limit. The targeted action is Establish supported hierarchical scheduler and parent shaping policy.

B:

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 Subinterfaces together exceed the parent shaping budget during congestion. It instead requires establish supported hierarchical scheduler and parent shaping policy.

D:

This remediates queue-specific congestion and scheduler weights hide localized buffer exhaustion, normally indicated by Application packet loss remains high even with low measured total interface utilization. It would leave the observed problem (Subinterfaces together exceed the parent shaping budget during congestion) unresolved. Address it with establish supported hierarchical scheduler and parent shaping policy.

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.

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