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Exam Code: JN0-650

Exam Name: Enterprise Routing and Switching, Professional (JNCIP-ENT)

Certification Provider: Juniper

Corresponding Certification: JNCIP-ENT

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Juniper JN0-650 Practice Test 69

Question 680

An enterprise network designer recommends: Differentiate forwarding class from packet-loss priority in Junos CoS policy. Which situation most clearly calls for this action?

  1. Traffic from an unmarked application must be assigned to a forwarding class based on source, destination and transport port.
  2. Two applications use one forwarding class but one should be more likely to be dropped under congestion.
  3. A network assigns drop precedence to packets in addition to service class, but the operator assumes they are the same attribute.
  4. An enterprise access edge receives DSCP-marked traffic from a source that must not be trusted to self-assign high priority.

Explanation

Correct Answer

C:

This case requires the CoS packet-loss priority action. Service queue assignment and relative drop precedence can be controlled independently.

Incorrect Answers

A:

This other case would be better matched to Use a supported firewall-filter multifield classifier with forwarding-class action. Packets can be classified using header match fields rather than trusting DSCP alone.

B:

This other case would be better matched to Assign the less critical packets a higher loss priority in classification. Congestion drop policy can distinguish the relative discard preference within a queue.

D:

This other case would be better matched to Reclassify or remark untrusted ingress traffic according to a controlled classification policy. Untrusted endpoint markings do not automatically obtain privileged forwarding treatment.

Question 681

Voice packets must have low queuing delay relative to best-effort traffic during link congestion. Which Junos networking action or protocol decision best addresses this requirement?

  1. Configure supported high-priority scheduler treatment with suitable rate controls for the voice class.
  2. Inspect output queue drops, scheduler assignments and CoS statistics during congestion.
  3. Tune supported scheduler buffer allocation for the affected output queue.
  4. Use supported egress shaping at the appropriate hierarchy and rate.

Explanation

Correct Answer

A:

This action addresses Strict-priority voice queue. Delay-sensitive packets can receive preferential transmission service within configured bounds.

Incorrect Answers

B:

That action targets Queue congestion diagnosis: The engineer can distinguish scheduling or queue-drop contention from physical interface errors. It does not directly resolve the stated Strict-priority voice queue requirement.

C:

That action targets Buffer management: The queue can absorb intended bursts within the physical and policy limits. It does not directly resolve the stated Strict-priority voice queue requirement.

D:

That action targets Shaper egress smoothing: Buffered traffic can be scheduled to respect the desired output rate. It does not directly resolve the stated Strict-priority voice queue requirement.

Question 682

A Junos network engineer takes this step: Configure supported high-priority scheduler treatment with suitable rate controls for the voice class. Which outcome most directly follows?

  1. Buffered traffic can be scheduled to respect the desired output rate.
  2. Delay-sensitive packets can receive preferential transmission service within configured bounds.
  3. The queue can absorb intended bursts within the physical and policy limits.
  4. The engineer can distinguish scheduling or queue-drop contention from physical interface errors.

Explanation

Correct Answer

B:

This is the direct result of the Strict-priority voice queue decision: Delay-sensitive packets can receive preferential transmission service within configured bounds.

Incorrect Answers

A:

This outcome is associated with Shaper egress smoothing (Use supported egress shaping at the appropriate hierarchy and rate.), not the specified action.

C:

This outcome is associated with Buffer management (Tune supported scheduler buffer allocation for the affected output queue.), not the specified action.

D:

This outcome is associated with Queue congestion diagnosis (Inspect output queue drops, scheduler assignments and CoS statistics during congestion.), not the specified action.

Question 683

Voice packets must have low queuing delay relative to best-effort traffic during link congestion. A colleague instead suggests: Tune supported scheduler buffer allocation for the affected output queue. Which corrective approach most directly addresses the original issue?

  1. Tune supported scheduler buffer allocation for the affected output queue.
  2. Use supported egress shaping at the appropriate hierarchy and rate.
  3. Configure supported high-priority scheduler treatment with suitable rate controls for the voice class.
  4. Inspect output queue drops, scheduler assignments and CoS statistics during congestion.

Explanation

Correct Answer

C:

This corrective choice addresses Strict-priority voice queue. Delay-sensitive packets can receive preferential transmission service within configured bounds.

Incorrect Answers

A:

That alternative applies to Buffer management instead. The queue can absorb intended bursts within the physical and policy limits.

B:

That alternative applies to Shaper egress smoothing instead. Buffered traffic can be scheduled to respect the desired output rate.

D:

That alternative applies to Queue congestion diagnosis instead. The engineer can distinguish scheduling or queue-drop contention from physical interface errors.

Question 684

An enterprise network designer recommends: Configure supported high-priority scheduler treatment with suitable rate controls for the voice class. Which situation most clearly calls for this action?

  1. An uplink is physically error-free, but video quality drops whenever a bulk file transfer begins.
  2. Bursty data drops even though sustained link usage is moderate because queue buffering is insufficient.
  3. Traffic exits a router toward a slower contracted circuit and bursts must be smoothed before reaching that circuit.
  4. Voice packets must have low queuing delay relative to best-effort traffic during link congestion.

Explanation

Correct Answer

D:

This case requires the Strict-priority voice queue action. Delay-sensitive packets can receive preferential transmission service within configured bounds.

Incorrect Answers

A:

This other case would be better matched to Inspect output queue drops, scheduler assignments and CoS statistics during congestion. The engineer can distinguish scheduling or queue-drop contention from physical interface errors.

B:

This other case would be better matched to Tune supported scheduler buffer allocation for the affected output queue. The queue can absorb intended bursts within the physical and policy limits.

C:

This other case would be better matched to Use supported egress shaping at the appropriate hierarchy and rate. Buffered traffic can be scheduled to respect the desired output rate.

Question 685

A link should reserve a predictable fraction of output service for a business-critical application during contention. Which Junos networking action or protocol decision best addresses this requirement?

  1. Apply the scheduler map to the intended egress interface.
  2. Apply an appropriate Junos traffic policer with defined rate and burst bounds.
  3. Configure a CoS scheduler transmit-rate allocation for the relevant forwarding class.
  4. Use egress shaping when buffering and pacing is required, and policing for excess-rate enforcement.

Explanation

Correct Answer

C:

This action addresses Scheduler transmit rate. The assigned queue has a defined share of available transmission service.

Incorrect Answers

A:

That action targets Scheduler map attachment: The interface queues can use the configured class-to-scheduler assignment. It does not directly resolve the stated Scheduler transmit rate requirement.

B:

That action targets Policer excess-rate control: Traffic exceeding the committed allowance can be dropped or treated as configured. It does not directly resolve the stated Scheduler transmit rate requirement.

D:

That action targets Policing versus shaping: The design differentiates packet delaying from packet discarding or marking. It does not directly resolve the stated Scheduler transmit rate requirement.

Question 686

A Junos network engineer takes this step: Configure a CoS scheduler transmit-rate allocation for the relevant forwarding class. Which outcome most directly follows?

  1. The interface queues can use the configured class-to-scheduler assignment.
  2. The design differentiates packet delaying from packet discarding or marking.
  3. Traffic exceeding the committed allowance can be dropped or treated as configured.
  4. The assigned queue has a defined share of available transmission service.

Explanation

Correct Answer

D:

This is the direct result of the Scheduler transmit rate decision: The assigned queue has a defined share of available transmission service.

Incorrect Answers

A:

This outcome is associated with Scheduler map attachment (Apply the scheduler map to the intended egress interface.), not the specified action.

B:

This outcome is associated with Policing versus shaping (Use egress shaping when buffering and pacing is required, and policing for excess-rate enforcement.), not the specified action.

C:

This outcome is associated with Policer excess-rate control (Apply an appropriate Junos traffic policer with defined rate and burst bounds.), not the specified action.

Question 687

A link should reserve a predictable fraction of output service for a business-critical application during contention. A colleague instead suggests: Apply an appropriate Junos traffic policer with defined rate and burst bounds. Which corrective approach most directly addresses the original issue?

  1. Configure a CoS scheduler transmit-rate allocation for the relevant forwarding class.
  2. Apply the scheduler map to the intended egress interface.
  3. Use egress shaping when buffering and pacing is required, and policing for excess-rate enforcement.
  4. Apply an appropriate Junos traffic policer with defined rate and burst bounds.

Explanation

Correct Answer

A:

This corrective choice addresses Scheduler transmit rate. The assigned queue has a defined share of available transmission service.

Incorrect Answers

B:

That alternative applies to Scheduler map attachment instead. The interface queues can use the configured class-to-scheduler assignment.

C:

That alternative applies to Policing versus shaping instead. The design differentiates packet delaying from packet discarding or marking.

D:

That alternative applies to Policer excess-rate control instead. Traffic exceeding the committed allowance can be dropped or treated as configured.

Question 688

An enterprise network designer recommends: Configure a CoS scheduler transmit-rate allocation for the relevant forwarding class. Which situation most clearly calls for this action?

  1. A network manager expects an ingress policer to hold excess packets in a queue for later forwarding.
  2. A link should reserve a predictable fraction of output service for a business-critical application during contention.
  3. A customer-facing ingress port sends traffic well above an agreed rate and must be limited rather than buffered indefinitely.
  4. A CoS scheduler map has correct priorities but the production egress port continues using default queue scheduling.

Explanation

Correct Answer

B:

This case requires the Scheduler transmit rate action. The assigned queue has a defined share of available transmission service.

Incorrect Answers

A:

This other case would be better matched to Use egress shaping when buffering and pacing is required, and policing for excess-rate enforcement. The design differentiates packet delaying from packet discarding or marking.

C:

This other case would be better matched to Apply an appropriate Junos traffic policer with defined rate and burst bounds. Traffic exceeding the committed allowance can be dropped or treated as configured.

D:

This other case would be better matched to Apply the scheduler map to the intended egress interface. The interface queues can use the configured class-to-scheduler assignment.

Question 689

Bursty data drops even though sustained link usage is moderate because queue buffering is insufficient. Which Junos networking action or protocol decision best addresses this requirement?

  1. Use supported egress shaping at the appropriate hierarchy and rate.
  2. Inspect output queue drops, scheduler assignments and CoS statistics during congestion.
  3. Tune supported scheduler buffer allocation for the affected output queue.
  4. Configure supported high-priority scheduler treatment with suitable rate controls for the voice class.

Explanation

Correct Answer

C:

This action addresses Buffer management. The queue can absorb intended bursts within the physical and policy limits.

Incorrect Answers

A:

That action targets Shaper egress smoothing: Buffered traffic can be scheduled to respect the desired output rate. It does not directly resolve the stated Buffer management requirement.

B:

That action targets Queue congestion diagnosis: The engineer can distinguish scheduling or queue-drop contention from physical interface errors. It does not directly resolve the stated Buffer management requirement.

D:

That action targets Strict-priority voice queue: Delay-sensitive packets can receive preferential transmission service within configured bounds. It does not directly resolve the stated Buffer management requirement.

Question 690

A Junos network engineer takes this step: Tune supported scheduler buffer allocation for the affected output queue. Which outcome most directly follows?

  1. Buffered traffic can be scheduled to respect the desired output rate.
  2. Delay-sensitive packets can receive preferential transmission service within configured bounds.
  3. The engineer can distinguish scheduling or queue-drop contention from physical interface errors.
  4. The queue can absorb intended bursts within the physical and policy limits.

Explanation

Correct Answer

D:

This is the direct result of the Buffer management decision: The queue can absorb intended bursts within the physical and policy limits.

Incorrect Answers

A:

This outcome is associated with Shaper egress smoothing (Use supported egress shaping at the appropriate hierarchy and rate.), not the specified action.

B:

This outcome is associated with Strict-priority voice queue (Configure supported high-priority scheduler treatment with suitable rate controls for the voice class.), not the specified action.

C:

This outcome is associated with Queue congestion diagnosis (Inspect output queue drops, scheduler assignments and CoS statistics during congestion.), not the specified action.

Enterprise Routing and Switching, Professional (JNCIP-ENT) (JN0-650) Practice Tests