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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 45

Question 440

A WAN QoS filter counts packets by packet-loss priority. Observed: Policer counters rise but the wrong loss-priority bit is set internally. What operational check best guards against this problem returning?

  1. 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.
  2. 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.
  3. 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.
  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

D:

This control asks for the same recovery evidence (Internal class and loss-priority counters match the policy for each sample flow) and flags recurrence of the same failure (Policer counters rise but the wrong loss-priority bit is set internally). It targets the underlying issue, the policy sets a forwarding class but omits the packet-loss priority action, rather than a different service problem. The exact cadence must be agreed with operations.

Incorrect Answers

A:

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: Policer counters rise but the wrong loss-priority bit is set internally. The appropriate check requires internal class and loss-priority counters match the policy for each sample flow.

B:

It is valid for another service scenario but checks premium traffic is delivered as best effort because the incoming label class is not decoded. This case instead needs a gate for policer counters rise but the wrong loss-priority bit is set internally and evidence that internal class and loss-priority counters match the policy for each sample flow.

C:

The proposed control is tied to a dscp classifier is not bound to the ingress traffic interface, typically observed when traffic with a valid voice DSCP enters the default best-effort queue. Here the target is the policy sets a forwarding class but omits the packet-loss priority action; monitor internal class and loss-priority counters match the policy for each sample flow.

Question 441

A PE aggregates several customers into a shared scheduler map. Observed: A new customer receives the same bandwidth guarantee as the largest existing customer. Which targeted remediation is most appropriate for the observed condition?

  1. Assign the correct per-customer scheduler profile and respect parent capacity.
  2. Align class preservation and rewrite behavior at the MPLS/IP boundary.
  3. Limit the high-priority offered rate and use appropriate scheduling for the remaining classes.
  4. Define and attach an authorized DSCP rewrite rule on the egress side.

Explanation

Correct Answer

A:

This fix addresses the stated cause rather than an unrelated protocol. The reported symptom—A new customer receives the same bandwidth guarantee as the largest existing customer—is consistent with tenant-facing scheduler profiles were copied without evaluating each contracted committed rate. Use the specified correction, then verify: Measured per-customer service rates match the individual contracts under shared load. Preserve existing policy and tenant isolation.

Incorrect Answers

B:

The option may be useful when dSCP-based priority is lost after penultimate-hop processing, but that is not the current evidence. Here, a new customer receives the same bandwidth guarantee as the largest existing customer, indicating tenant-facing scheduler profiles were copied without evaluating each contracted committed rate. The targeted action is Assign the correct per-customer scheduler profile and respect parent capacity.

C:

This change belongs to a different Class of Service (CoS) issue: Other business queues starve whenever monitoring traffic floods. That issue involves a strict-priority queue has no effective cap or rate control. The current symptom is A new customer receives the same bandwidth guarantee as the largest existing customer. It instead requires assign the correct per-customer scheduler profile and respect parent capacity.

D:

This remediates the egress rewrite rule does not map forwarding class and loss priority to the agreed codepoint, normally indicated by Packets leave the WAN interface with DSCP zero despite correct internal classification. It would leave the observed problem (A new customer receives the same bandwidth guarantee as the largest existing customer) unresolved. Address it with assign the correct per-customer scheduler profile and respect parent capacity.

Question 442

A PE aggregates several customers into a shared scheduler map. Observed: A new customer receives the same bandwidth guarantee as the largest existing customer. What evidence would validate recovery from this precise failure mode?

  1. The service retains agreed CoS marks and priority from ingress to customer-facing egress.
  2. Captured outgoing frames retain the contracted DSCP markings.
  3. Critical monitoring meets latency objectives while business queues retain guaranteed service.
  4. Measured per-customer service rates match the individual contracts under shared load.

Explanation

Correct Answer

D:

The intended result is Measured per-customer service rates match the individual contracts under shared load. It specifically verifies recovery from tenant-facing scheduler profiles were copied without evaluating each contracted committed rate, which produced the original symptom: A new customer receives the same bandwidth guarantee as the largest existing customer. It is stronger evidence than a generic interface-up indicator.

Incorrect Answers

A:

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 tenant-facing scheduler profiles were copied without evaluating each contracted committed rate, and the relevant success signal is Measured per-customer service rates match the individual contracts under shared load.

B:

This result is useful in another case with evidence Packets leave the WAN interface with DSCP zero despite correct internal classification. It does not test recovery from a new customer receives the same bandwidth guarantee as the largest existing customer. Check instead whether measured per-customer service rates match the individual contracts under shared load.

C:

It confirms an unrelated service correction: A strict-priority queue has no effective cap or rate control. The present case reports A new customer receives the same bandwidth guarantee as the largest existing customer. Its completion test is Measured per-customer service rates match the individual contracts under shared load.

Question 443

A PE aggregates several customers into a shared scheduler map. Observed: A new customer receives the same bandwidth guarantee as the largest existing customer. What underlying protocol or service configuration problem best explains the evidence?

  1. MPLS-to-IP class mapping at label pop or egress PE is inconsistent.
  2. A strict-priority queue has no effective cap or rate control.
  3. Tenant-facing scheduler profiles were copied without evaluating each contracted committed rate.
  4. The egress rewrite rule does not map forwarding class and loss priority to the agreed codepoint.

Explanation

Correct Answer

C:

Because a new customer receives the same bandwidth guarantee as the largest existing customer, the likely cause is tenant-facing scheduler profiles were copied without evaluating each contracted committed rate. It is testable: Assign the correct per-customer scheduler profile and respect parent capacity. Expected follow-up: Measured per-customer service rates match the individual contracts under shared load.

Incorrect Answers

A:

The stated cause is possible elsewhere but explains dscp-based priority is lost after penultimate-hop processing, not a new customer receives the same bandwidth guarantee as the largest existing customer. This incident is better attributed to tenant-facing scheduler profiles were copied without evaluating each contracted committed rate.

B:

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

D:

That explanation fits another condition: Packets leave the WAN interface with DSCP zero despite correct internal classification. The evidence here is A new customer receives the same bandwidth guarantee as the largest existing customer. Its closer root cause is Tenant-facing scheduler profiles were copied without evaluating each contracted committed rate.

Question 444

A PE aggregates several customers into a shared scheduler map. Observed: A new customer receives the same bandwidth guarantee as the largest existing customer. Which ongoing validation gate would best detect a recurrence of this problem?

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

Explanation

Correct Answer

D:

A useful regression gate tests whether measured per-customer service rates match the individual contracts under shared load and alerts when a new customer receives the same bandwidth guarantee as the largest existing customer. This directly checks the technical weakness: Tenant-facing scheduler profiles were copied without evaluating each contracted committed rate. 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 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 tenant-facing scheduler profiles were copied without evaluating each contracted committed rate; monitor measured per-customer service rates match the individual contracts under shared load.

B:

This gate monitors a different failure, other business queues starve whenever monitoring traffic floods. It would not detect the current problem: A new customer receives the same bandwidth guarantee as the largest existing customer. The appropriate check requires measured per-customer service rates match the individual contracts under shared load.

C:

It is valid for another service scenario but checks packets leave the wan interface with dscp zero despite correct internal classification. This case instead needs a gate for a new customer receives the same bandwidth guarantee as the largest existing customer and evidence that measured per-customer service rates match the individual contracts under shared load.

Question 445

An MPLS transport service carries packets across three P routers. Observed: DSCP-based priority is lost after penultimate-hop processing. Which change most directly corrects the failure while respecting the existing service boundary?

  1. Validate the shaping rate and supported overhead accounting against the contracted service.
  2. Implement scoped control-plane protection and scheduler allocation without unbounded starvation.
  3. Align class preservation and rewrite behavior at the MPLS/IP boundary.
  4. Assign priority and bandwidth guarantees aligned with measured class demand and loss objectives.

Explanation

Correct Answer

C:

The observed condition is DSCP-based priority is lost after penultimate-hop processing. That indicates mpls-to-ip class mapping at label pop or egress pe is inconsistent. Applying the proposed remedy directly changes that condition. A concrete completion check is: The service retains agreed CoS marks and priority from ingress to customer-facing egress.

Incorrect Answers

A:

The option may be useful when egress utilization consistently exceeds the expected data rate when frame overhead is included, but that is not the current evidence. Here, dSCP-based priority is lost after penultimate-hop processing, indicating mpls-to-ip class mapping at label pop or egress pe is inconsistent. The targeted action is Align class preservation and rewrite behavior at the MPLS/IP boundary.

B:

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 (DSCP-based priority is lost after penultimate-hop processing) unresolved. Address it with align class preservation and rewrite behavior at the MPLS/IP boundary.

D:

This change belongs to a different Class of Service (CoS) issue: The premium application suffers sustained loss before any low-priority flow is dropped. That issue involves egress queue weights and scheduler priorities conflict with the sla. The current symptom is DSCP-based priority is lost after penultimate-hop processing. It instead requires align class preservation and rewrite behavior at the MPLS/IP boundary.

Question 446

An MPLS transport service carries packets across three P routers. Observed: DSCP-based priority is lost after penultimate-hop processing. After the correction, which result would most convincingly show that this fault is resolved?

  1. The service retains agreed CoS marks and priority from ingress to customer-facing egress.
  2. Measured wire-rate remains inside the agreed SLA under saturated load.
  3. Routing sessions remain healthy while excess guest traffic is rate-limited.
  4. Premium queue loss stays bounded while low-priority bursts are controlled.

Explanation

Correct Answer

A:

After align class preservation and rewrite behavior at the MPLS/IP boundary, inspect whether the service retains agreed CoS marks and priority from ingress to customer-facing egress. This closes the loop between the reported observation (DSCP-based priority is lost after penultimate-hop processing) and the underlying issue (MPLS-to-IP class mapping at label pop or egress PE is inconsistent).

Incorrect Answers

B:

That observation would verify a separate fault involving the shaping policy ignores link framing and encapsulation overhead assumptions. Its symptom is Egress utilization consistently exceeds the expected data rate when frame overhead is included. For this case the actual issue is mpls-to-ip class mapping at label pop or egress pe is inconsistent, and the relevant success signal is The service retains agreed CoS marks and priority from ingress to customer-facing egress.

C:

This result is useful in another case with evidence BGP keepalives are delayed under volumetric guest transit load. It does not test recovery from dscp-based priority is lost after penultimate-hop processing. Check instead whether the service retains agreed CoS marks and priority from ingress to customer-facing egress.

D:

It confirms an unrelated service correction: Egress queue weights and scheduler priorities conflict with the SLA. The present case reports DSCP-based priority is lost after penultimate-hop processing. Its completion test is The service retains agreed CoS marks and priority from ingress to customer-facing egress.

Question 447

An MPLS transport service carries packets across three P routers. Observed: DSCP-based priority is lost after penultimate-hop processing. Which root cause is most consistent with this symptom?

  1. Egress queue weights and scheduler priorities conflict with the SLA.
  2. MPLS-to-IP class mapping at label pop or egress PE is inconsistent.
  3. The shaping policy ignores link framing and encapsulation overhead assumptions.
  4. Control-plane class lacks rate and priority protection in the congestion policy.

Explanation

Correct Answer

B:

The reported evidence—DSCP-based priority is lost after penultimate-hop processing—supports mpls-to-ip class mapping at label pop or egress pe is inconsistent. The appropriate intervention is to align class preservation and rewrite behavior at the MPLS/IP boundary, with confirmation from the service retains agreed CoS marks and priority from ingress to customer-facing egress. Other causes require actual device-state verification.

Incorrect Answers

A:

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

C:

The stated cause is possible elsewhere but explains egress utilization consistently exceeds the expected data rate when frame overhead is included, not dscp-based priority is lost after penultimate-hop processing. This incident is better attributed to mpls-to-ip class mapping at label pop or egress pe is inconsistent.

D:

That explanation fits another condition: BGP keepalives are delayed under volumetric guest transit load. The evidence here is DSCP-based priority is lost after penultimate-hop processing. Its closer root cause is MPLS-to-IP class mapping at label pop or egress PE is inconsistent.

Question 448

An MPLS transport service carries packets across three P routers. Observed: DSCP-based priority is lost after penultimate-hop processing. Which change-acceptance control is most relevant to preventing this exact failure?

  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 routing sessions remain healthy while excess guest traffic is rate-limited. Flag recurrence if bGP keepalives are delayed under volumetric guest transit load.
  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 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

D:

The control is specific to the initial failure. It requires the result The service retains agreed CoS marks and priority from ingress to customer-facing egress. and treats DSCP-based priority is lost after penultimate-hop processing. as a failure signal. The causal concern is mpls-to-ip class mapping at label pop or egress pe is inconsistent.

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: DSCP-based priority is lost after penultimate-hop processing. The appropriate check requires the service retains agreed CoS marks and priority from ingress to customer-facing egress.

B:

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 dscp-based priority is lost after penultimate-hop processing and evidence that the service retains agreed CoS marks and priority from ingress to customer-facing egress.

C:

The proposed control is tied to the shaping policy ignores link framing and encapsulation overhead assumptions, typically observed when egress utilization consistently exceeds the expected data rate when frame overhead is included. Here the target is mpls-to-ip class mapping at label pop or egress pe is inconsistent; monitor the service retains agreed CoS marks and priority from ingress to customer-facing egress.

Question 449

A core service requires minimum bandwidth for control-plane routing traffic. Observed: BGP keepalives are delayed under volumetric guest transit load. What should the routing engineer change first to address this particular symptom?

  1. Implement scoped control-plane protection and scheduler allocation without unbounded starvation.
  2. Align ingress classification with the active VPN traffic identifier and scheduler map.
  3. Correct the firewall filter policer association and verify units and burst allowance.
  4. Inspect per-queue offered rate and adjust guarantees and drop settings to actual demand.

Explanation

Correct Answer

A:

The decisive evidence is that BGP keepalives are delayed under volumetric guest transit load. This follows from control-plane class lacks rate and priority protection in the congestion policy. The focused remedy is to implement scoped control-plane protection and scheduler allocation without unbounded starvation. Confirm improvement when routing sessions remain healthy while excess guest traffic is rate-limited. Validate on an approved lab or change window before touching production.

Incorrect Answers

B:

This remediates classifier and forwarding-class mappings do not match the chosen vpn traffic selector, normally indicated by VPN queue counters show no packets despite known VPN load. It would leave the observed problem (BGP keepalives are delayed under volumetric guest transit load) unresolved. Address it with implement scoped control-plane protection and scheduler allocation without unbounded starvation.

C:

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, bGP keepalives are delayed under volumetric guest transit load, indicating control-plane class lacks rate and priority protection in the congestion policy. The targeted action is Implement scoped control-plane protection and scheduler allocation without unbounded starvation.

D:

This change belongs to a different Class of Service (CoS) issue: Application packet loss remains high even with low measured total interface utilization. That issue involves queue-specific congestion and scheduler weights hide localized buffer exhaustion. The current symptom is BGP keepalives are delayed under volumetric guest transit load. It instead requires implement scoped control-plane protection and scheduler allocation without unbounded starvation.

Question 450

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

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

Explanation

Correct Answer

C:

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

Incorrect Answers

A:

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

B:

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

D:

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

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