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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 42

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.

Question 411

A service interface uses strict-high priority for a monitoring class. Observed: Other business queues starve whenever monitoring traffic floods. Which root cause is most consistent with this symptom?

  1. The shaping policy ignores link framing and encapsulation overhead assumptions.
  2. Tenant-facing scheduler profiles were copied without evaluating each contracted committed rate.
  3. A strict-priority queue has no effective cap or rate control.
  4. The egress rewrite rule does not map forwarding class and loss priority to the agreed codepoint.

Explanation

Correct Answer

C:

The reported evidence—Other business queues starve whenever monitoring traffic floods—supports a strict-priority queue has no effective cap or rate control. The appropriate intervention is to limit the high-priority offered rate and use appropriate scheduling for the remaining classes, with confirmation from critical monitoring meets latency objectives while business queues retain guaranteed service. Other causes require actual device-state verification.

Incorrect Answers

A:

That explanation fits another condition: Egress utilization consistently exceeds the expected data rate when frame overhead is included. The evidence here is Other business queues starve whenever monitoring traffic floods. Its closer root cause is A strict-priority queue has no effective cap or rate control.

B:

Tenant-facing scheduler profiles were copied without evaluating each contracted committed rate. would normally be accompanied by a new customer receives the same bandwidth guarantee as the largest existing customer. The observed symptom is different: Other business queues starve whenever monitoring traffic floods. The likely cause is A strict-priority queue has no effective cap or rate control.

D:

The stated cause is possible elsewhere but explains packets leave the wan interface with dscp zero despite correct internal classification, not other business queues starve whenever monitoring traffic floods. This incident is better attributed to a strict-priority queue has no effective cap or rate control.

Question 412

A service interface uses strict-high priority for a monitoring class. Observed: Other business queues starve whenever monitoring traffic floods. Which change-acceptance control is most relevant to preventing this exact failure?

  1. 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.
  2. 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.
  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

D:

The control is specific to the initial failure. It requires the result Critical monitoring meets latency objectives while business queues retain guaranteed service. and treats Other business queues starve whenever monitoring traffic floods. as a failure signal. The causal concern is a strict-priority queue has no effective cap or rate control.

Incorrect Answers

A:

The proposed control is tied to the egress rewrite rule does not map forwarding class and loss priority to the agreed codepoint, typically observed when packets leave the WAN interface with DSCP zero despite correct internal classification. Here the target is a strict-priority queue has no effective cap or rate control; monitor critical monitoring meets latency objectives while business queues retain guaranteed service.

B:

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 other business queues starve whenever monitoring traffic floods and evidence that critical monitoring meets latency objectives while business queues retain guaranteed service.

C:

This gate monitors a different failure, a new customer receives the same bandwidth guarantee as the largest existing customer. It would not detect the current problem: Other business queues starve whenever monitoring traffic floods. The appropriate check requires critical monitoring meets latency objectives while business queues retain guaranteed service.

Question 413

A carrier calculates scheduler transmit rates for a shaped Ethernet circuit. Observed: Egress utilization consistently exceeds the expected data rate when frame overhead is included. What should the routing engineer change first to address this particular symptom?

  1. Assign priority and bandwidth guarantees aligned with measured class demand and loss objectives.
  2. Align class preservation and rewrite behavior at the MPLS/IP boundary.
  3. Validate the shaping rate and supported overhead accounting against the contracted service.
  4. Align ingress classification with the active VPN traffic identifier and scheduler map.

Explanation

Correct Answer

C:

The decisive evidence is that Egress utilization consistently exceeds the expected data rate when frame overhead is included. This follows from the shaping policy ignores link framing and encapsulation overhead assumptions. The focused remedy is to validate the shaping rate and supported overhead accounting against the contracted service. Confirm improvement when measured wire-rate remains inside the agreed SLA under saturated load. Validate on an approved lab or change window before touching production.

Incorrect Answers

A:

This remediates egress queue weights and scheduler priorities conflict with the sla, normally indicated by The premium application suffers sustained loss before any low-priority flow is dropped. It would leave the observed problem (Egress utilization consistently exceeds the expected data rate when frame overhead is included) unresolved. Address it with validate the shaping rate and supported overhead accounting against the contracted service.

B:

The option may be useful when dSCP-based priority is lost after penultimate-hop processing, but that is not the current evidence. Here, egress utilization consistently exceeds the expected data rate when frame overhead is included, indicating the shaping policy ignores link framing and encapsulation overhead assumptions. The targeted action is Validate the shaping rate and supported overhead accounting against the contracted service.

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 Egress utilization consistently exceeds the expected data rate when frame overhead is included. It instead requires validate the shaping rate and supported overhead accounting against the contracted service.

Question 414

A carrier calculates scheduler transmit rates for a shaped Ethernet circuit. Observed: Egress utilization consistently exceeds the expected data rate when frame overhead is included. Which acceptance observation best confirms that the proposed change worked?

  1. Premium queue loss stays bounded while low-priority bursts are controlled.
  2. VPN packets increment the intended queue counters and receive the agreed service.
  3. Measured wire-rate remains inside the agreed SLA under saturated load.
  4. The service retains agreed CoS marks and priority from ingress to customer-facing egress.

Explanation

Correct Answer

C:

This acceptance criterion tests the actual fault. The source evidence was Egress utilization consistently exceeds the expected data rate when frame overhead is included. The correction addresses the shaping policy ignores link framing and encapsulation overhead assumptions; success requires measured wire-rate remains inside the agreed SLA under saturated load.

Incorrect Answers

A:

This result is useful in another case with evidence The premium application suffers sustained loss before any low-priority flow is dropped. It does not test recovery from egress utilization consistently exceeds the expected data rate when frame overhead is included. Check instead whether measured wire-rate remains inside the agreed SLA under saturated load.

B:

It confirms an unrelated service correction: Classifier and forwarding-class mappings do not match the chosen VPN traffic selector. The present case reports Egress utilization consistently exceeds the expected data rate when frame overhead is included. Its completion test is Measured wire-rate remains inside the agreed SLA under saturated load.

D:

That observation would verify a separate fault involving mpls-to-ip class mapping at label pop or egress pe is inconsistent. Its symptom is DSCP-based priority is lost after penultimate-hop processing. For this case the actual issue is the shaping policy ignores link framing and encapsulation overhead assumptions, and the relevant success signal is Measured wire-rate remains inside the agreed SLA under saturated load.

Question 415

A carrier calculates scheduler transmit rates for a shaped Ethernet circuit. Observed: Egress utilization consistently exceeds the expected data rate when frame overhead is included. What is the most likely source of the observed routing or service failure?

  1. Egress queue weights and scheduler priorities conflict with the SLA.
  2. Classifier and forwarding-class mappings do not match the chosen VPN traffic selector.
  3. The shaping policy ignores link framing and encapsulation overhead assumptions.
  4. MPLS-to-IP class mapping at label pop or egress PE is inconsistent.

Explanation

Correct Answer

C:

This explanation is the closest match to the observed symptom: Egress utilization consistently exceeds the expected data rate when frame overhead is included. The specified root issue is The shaping policy ignores link framing and encapsulation overhead assumptions. Repair it through validate the shaping rate and supported overhead accounting against the contracted service, then check measured wire-rate remains inside the agreed SLA under saturated load.

Incorrect Answers

A:

That explanation fits another condition: The premium application suffers sustained loss before any low-priority flow is dropped. The evidence here is Egress utilization consistently exceeds the expected data rate when frame overhead is included. Its closer root cause is The shaping policy ignores link framing and encapsulation overhead assumptions.

B:

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: Egress utilization consistently exceeds the expected data rate when frame overhead is included. The likely cause is The shaping policy ignores link framing and encapsulation overhead assumptions.

D:

The stated cause is possible elsewhere but explains dscp-based priority is lost after penultimate-hop processing, not egress utilization consistently exceeds the expected data rate when frame overhead is included. This incident is better attributed to the shaping policy ignores link framing and encapsulation overhead assumptions.

Question 416

A carrier calculates scheduler transmit rates for a shaped Ethernet circuit. Observed: Egress utilization consistently exceeds the expected data rate when frame overhead is included. What operational check best guards against this problem returning?

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

Explanation

Correct Answer

C:

This control asks for the same recovery evidence (Measured wire-rate remains inside the agreed SLA under saturated load) and flags recurrence of the same failure (Egress utilization consistently exceeds the expected data rate when frame overhead is included). It targets the underlying issue, the shaping policy ignores link framing and encapsulation overhead assumptions, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

A:

This gate monitors a different failure, vpn queue counters show no packets despite known vpn load. It would not detect the current problem: Egress utilization consistently exceeds the expected data rate when frame overhead is included. The appropriate check requires measured wire-rate remains inside the agreed SLA under saturated load.

B:

The proposed control is tied to mpls-to-ip class mapping at label pop or egress pe is inconsistent, typically observed when dSCP-based priority is lost after penultimate-hop processing. Here the target is the shaping policy ignores link framing and encapsulation overhead assumptions; monitor measured wire-rate remains inside the agreed SLA under saturated load.

D:

It is valid for another service scenario but checks the premium application suffers sustained loss before any low-priority flow is dropped. This case instead needs a gate for egress utilization consistently exceeds the expected data rate when frame overhead is included and evidence that measured wire-rate remains inside the agreed SLA under saturated load.

Question 417

A metro PE carries internet and private VPN traffic over one 10G interface. Observed: VPN queue counters show no packets despite known VPN load. 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 ingress classification with the active VPN traffic identifier and scheduler map.
  3. Review average queue depth thresholds and attach the intended drop profile to the proper scheduler.
  4. Implement scoped control-plane protection and scheduler allocation without unbounded starvation.

Explanation

Correct Answer

B:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—VPN queue counters show no packets despite known VPN load—is consistent with classifier and forwarding-class mappings do not match the chosen vpn traffic selector. Use the specified correction, then verify: VPN packets increment the intended queue counters and receive the agreed service. Preserve existing policy and tenant isolation.

Incorrect Answers

A:

This change belongs to a different Class of Service (CoS) issue: Business telemetry is discarded even when its contracted rate is not exceeded. That issue involves the policer match or bandwidth unit differs from the intended traffic contract. The current symptom is VPN queue counters show no packets despite known VPN load. It instead requires align ingress classification with the active VPN traffic identifier and scheduler map.

C:

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, vPN queue counters show no packets despite known VPN load, indicating classifier and forwarding-class mappings do not match the chosen vpn traffic selector. The targeted action is Align ingress classification with the active VPN traffic identifier and scheduler map.

D:

This remediates control-plane class lacks rate and priority protection in the congestion policy, normally indicated by BGP keepalives are delayed under volumetric guest transit load. It would leave the observed problem (VPN queue counters show no packets despite known VPN load) unresolved. Address it with align ingress classification with the active VPN traffic identifier and scheduler map.

Question 418

A metro PE carries internet and private VPN traffic over one 10G interface. Observed: VPN queue counters show no packets despite known VPN load. What evidence would validate recovery from this precise failure mode?

  1. Queue telemetry shows configured early-drop behavior before hard buffer exhaustion.
  2. In-profile traffic passes and only true excess traffic is policed.
  3. VPN packets increment the intended queue counters and receive the agreed service.
  4. Routing sessions remain healthy while excess guest traffic is rate-limited.

Explanation

Correct Answer

C:

The intended result is VPN packets increment the intended queue counters and receive the agreed service. It specifically verifies recovery from classifier and forwarding-class mappings do not match the chosen vpn traffic selector, which produced the original symptom: VPN queue counters show no packets despite known VPN load. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

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 classifier and forwarding-class mappings do not match the chosen vpn traffic selector, and the relevant success signal is VPN packets increment the intended queue counters and receive the agreed service.

B:

It confirms an unrelated service correction: The policer match or bandwidth unit differs from the intended traffic contract. The present case reports VPN queue counters show no packets despite known VPN load. Its completion test is VPN packets increment the intended queue counters and receive the agreed service.

D:

This result is useful in another case with evidence BGP keepalives are delayed under volumetric guest transit load. It does not test recovery from vpn queue counters show no packets despite known vpn load. Check instead whether vPN packets increment the intended queue counters and receive the agreed service.

Question 419

A metro PE carries internet and private VPN traffic over one 10G interface. Observed: VPN queue counters show no packets despite known VPN load. What underlying protocol or service configuration problem best explains the evidence?

  1. The WRED drop-profile threshold curve or attachment is incorrect.
  2. The policer match or bandwidth unit differs from the intended traffic contract.
  3. Classifier and forwarding-class mappings do not match the chosen VPN traffic selector.
  4. Control-plane class lacks rate and priority protection in the congestion policy.

Explanation

Correct Answer

C:

Because vPN queue counters show no packets despite known VPN load, the likely cause is classifier and forwarding-class mappings do not match the chosen vpn traffic selector. It is testable: Align ingress classification with the active VPN traffic identifier and scheduler map. Expected follow-up: VPN packets increment the intended queue counters and receive the agreed service.

Incorrect Answers

A:

The stated cause is possible elsewhere but explains tail drops occur abruptly rather than the expected early-drop progression, not vpn queue counters show no packets despite known vpn load. This incident is better attributed to classifier and forwarding-class mappings do not match the chosen vpn traffic selector.

B:

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

D:

That explanation fits another condition: BGP keepalives are delayed under volumetric guest transit load. The evidence here is VPN queue counters show no packets despite known VPN load. Its closer root cause is Classifier and forwarding-class mappings do not match the chosen VPN traffic selector.

Question 420

A metro PE carries internet and private VPN traffic over one 10G interface. Observed: VPN queue counters show no packets despite known VPN load. Which ongoing validation gate would best detect a recurrence of this problem?

  1. 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.
  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 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.
  4. 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.

Explanation

Correct Answer

A:

A useful regression gate tests whether vPN packets increment the intended queue counters and receive the agreed service and alerts when vPN queue counters show no packets despite known VPN load. This directly checks the technical weakness: Classifier and forwarding-class mappings do not match the chosen VPN traffic selector. 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, business telemetry is discarded even when its contracted rate is not exceeded. It would not detect the current problem: VPN queue counters show no packets despite known VPN load. The appropriate check requires vPN packets increment the intended queue counters and receive the agreed service.

C:

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 classifier and forwarding-class mappings do not match the chosen vpn traffic selector; monitor vPN packets increment the intended queue counters and receive the agreed service.

D:

It is valid for another service scenario but checks bgp keepalives are delayed under volumetric guest transit load. This case instead needs a gate for vpn queue counters show no packets despite known vpn load and evidence that vPN packets increment the intended queue counters and receive the agreed service.

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