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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 67

Question 660

An enterprise network designer recommends: Define appropriate CoS forwarding classes and map them to supported distinct queues. Which situation most clearly calls for this action?

  1. Ingress IP packets carry standardized DSCP markings that must map into Junos forwarding classes.
  2. A correct DSCP classifier exists under class-of-service but no interfaces refer to it.
  3. Voice and bulk traffic receive different forwarding requirements but are currently mapped into the same egress queue.
  4. An engineer suspects application packets are entering best-effort rather than their intended expedited forwarding class.

Explanation

Correct Answer

C:

This case requires the Forwarding-class mapping action. The traffic categories can be separated for different queue treatment.

Incorrect Answers

A:

This other case would be better matched to Apply a supported behavior-aggregate DSCP classifier on the incoming interface. The network can classify packets using existing DiffServ codepoint markings.

B:

This other case would be better matched to Attach the classifier to the intended ingress interfaces in the applicable Junos hierarchy. Received packets can actually be mapped to forwarding classes by the policy.

D:

This other case would be better matched to Inspect the applicable CoS classifier and forwarding-class interface statistics. The team can identify whether ingress classification assigned the expected traffic class.

Question 661

Two applications use one forwarding class but one should be more likely to be dropped under congestion. Which Junos networking action or protocol decision best addresses this requirement?

  1. Use a supported firewall-filter multifield classifier with forwarding-class action.
  2. Assign the less critical packets a higher loss priority in classification.
  3. Reclassify or remark untrusted ingress traffic according to a controlled classification policy.
  4. Differentiate forwarding class from packet-loss priority in Junos CoS policy.

Explanation

Correct Answer

B:

This action addresses Loss-priority assignment. Congestion drop policy can distinguish the relative discard preference within a queue.

Incorrect Answers

A:

That action targets Multifield classification: Packets can be classified using header match fields rather than trusting DSCP alone. It does not directly resolve the stated Loss-priority assignment requirement.

C:

That action targets Existing DSCP trust: Untrusted endpoint markings do not automatically obtain privileged forwarding treatment. It does not directly resolve the stated Loss-priority assignment requirement.

D:

That action targets CoS packet-loss priority: Service queue assignment and relative drop precedence can be controlled independently. It does not directly resolve the stated Loss-priority assignment requirement.

Question 662

A Junos network engineer takes this step: Assign the less critical packets a higher loss priority in classification. Which outcome most directly follows?

  1. Packets can be classified using header match fields rather than trusting DSCP alone.
  2. Service queue assignment and relative drop precedence can be controlled independently.
  3. Congestion drop policy can distinguish the relative discard preference within a queue.
  4. Untrusted endpoint markings do not automatically obtain privileged forwarding treatment.

Explanation

Correct Answer

C:

This is the direct result of the Loss-priority assignment decision: Congestion drop policy can distinguish the relative discard preference within a queue.

Incorrect Answers

A:

This outcome is associated with Multifield classification (Use a supported firewall-filter multifield classifier with forwarding-class action.), not the specified action.

B:

This outcome is associated with CoS packet-loss priority (Differentiate forwarding class from packet-loss priority in Junos CoS policy.), not the specified action.

D:

This outcome is associated with Existing DSCP trust (Reclassify or remark untrusted ingress traffic according to a controlled classification policy.), not the specified action.

Question 663

Two applications use one forwarding class but one should be more likely to be dropped under congestion. A colleague instead suggests: Reclassify or remark untrusted ingress traffic according to a controlled classification policy. Which corrective approach most directly addresses the original issue?

  1. Reclassify or remark untrusted ingress traffic according to a controlled classification policy.
  2. Use a supported firewall-filter multifield classifier with forwarding-class action.
  3. Differentiate forwarding class from packet-loss priority in Junos CoS policy.
  4. Assign the less critical packets a higher loss priority in classification.

Explanation

Correct Answer

D:

This corrective choice addresses Loss-priority assignment. Congestion drop policy can distinguish the relative discard preference within a queue.

Incorrect Answers

A:

That alternative applies to Existing DSCP trust instead. Untrusted endpoint markings do not automatically obtain privileged forwarding treatment.

B:

That alternative applies to Multifield classification instead. Packets can be classified using header match fields rather than trusting DSCP alone.

C:

That alternative applies to CoS packet-loss priority instead. Service queue assignment and relative drop precedence can be controlled independently.

Question 664

An enterprise network designer recommends: Assign the less critical packets a higher loss priority in classification. Which situation most clearly calls for this action?

  1. Two applications use one forwarding class but one should be more likely to be dropped under congestion.
  2. Traffic from an unmarked application must be assigned to a forwarding class based on source, destination and transport port.
  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

A:

This case requires the Loss-priority assignment action. Congestion drop policy can distinguish the relative discard preference within a queue.

Incorrect Answers

B:

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.

C:

This other case would be better matched to Differentiate forwarding class from packet-loss priority in Junos CoS policy. Service queue assignment and relative drop precedence can be controlled independently.

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 665

A correct DSCP classifier exists under class-of-service but no interfaces refer to it. Which Junos networking action or protocol decision best addresses this requirement?

  1. Attach the classifier to the intended ingress interfaces in the applicable Junos hierarchy.
  2. Define appropriate CoS forwarding classes and map them to supported distinct queues.
  3. Inspect the applicable CoS classifier and forwarding-class interface statistics.
  4. Apply a supported behavior-aggregate DSCP classifier on the incoming interface.

Explanation

Correct Answer

A:

This action addresses Ingress classifier attachment. Received packets can actually be mapped to forwarding classes by the policy.

Incorrect Answers

B:

That action targets Forwarding-class mapping: The traffic categories can be separated for different queue treatment. It does not directly resolve the stated Ingress classifier attachment requirement.

C:

That action targets Forwarding class inspection: The team can identify whether ingress classification assigned the expected traffic class. It does not directly resolve the stated Ingress classifier attachment requirement.

D:

That action targets DSCP behavior aggregate classifier: The network can classify packets using existing DiffServ codepoint markings. It does not directly resolve the stated Ingress classifier attachment requirement.

Question 666

A Junos network engineer takes this step: Attach the classifier to the intended ingress interfaces in the applicable Junos hierarchy. Which outcome most directly follows?

  1. The team can identify whether ingress classification assigned the expected traffic class.
  2. Received packets can actually be mapped to forwarding classes by the policy.
  3. The traffic categories can be separated for different queue treatment.
  4. The network can classify packets using existing DiffServ codepoint markings.

Explanation

Correct Answer

B:

This is the direct result of the Ingress classifier attachment decision: Received packets can actually be mapped to forwarding classes by the policy.

Incorrect Answers

A:

This outcome is associated with Forwarding class inspection (Inspect the applicable CoS classifier and forwarding-class interface statistics.), not the specified action.

C:

This outcome is associated with Forwarding-class mapping (Define appropriate CoS forwarding classes and map them to supported distinct queues.), not the specified action.

D:

This outcome is associated with DSCP behavior aggregate classifier (Apply a supported behavior-aggregate DSCP classifier on the incoming interface.), not the specified action.

Question 667

A correct DSCP classifier exists under class-of-service but no interfaces refer to it. A colleague instead suggests: Inspect the applicable CoS classifier and forwarding-class interface statistics. Which corrective approach most directly addresses the original issue?

  1. Inspect the applicable CoS classifier and forwarding-class interface statistics.
  2. Apply a supported behavior-aggregate DSCP classifier on the incoming interface.
  3. Attach the classifier to the intended ingress interfaces in the applicable Junos hierarchy.
  4. Define appropriate CoS forwarding classes and map them to supported distinct queues.

Explanation

Correct Answer

C:

This corrective choice addresses Ingress classifier attachment. Received packets can actually be mapped to forwarding classes by the policy.

Incorrect Answers

A:

That alternative applies to Forwarding class inspection instead. The team can identify whether ingress classification assigned the expected traffic class.

B:

That alternative applies to DSCP behavior aggregate classifier instead. The network can classify packets using existing DiffServ codepoint markings.

D:

That alternative applies to Forwarding-class mapping instead. The traffic categories can be separated for different queue treatment.

Question 668

An enterprise network designer recommends: Attach the classifier to the intended ingress interfaces in the applicable Junos hierarchy. Which situation most clearly calls for this action?

  1. Voice and bulk traffic receive different forwarding requirements but are currently mapped into the same egress queue.
  2. An engineer suspects application packets are entering best-effort rather than their intended expedited forwarding class.
  3. Ingress IP packets carry standardized DSCP markings that must map into Junos forwarding classes.
  4. A correct DSCP classifier exists under class-of-service but no interfaces refer to it.

Explanation

Correct Answer

D:

This case requires the Ingress classifier attachment action. Received packets can actually be mapped to forwarding classes by the policy.

Incorrect Answers

A:

This other case would be better matched to Define appropriate CoS forwarding classes and map them to supported distinct queues. The traffic categories can be separated for different queue treatment.

B:

This other case would be better matched to Inspect the applicable CoS classifier and forwarding-class interface statistics. The team can identify whether ingress classification assigned the expected traffic class.

C:

This other case would be better matched to Apply a supported behavior-aggregate DSCP classifier on the incoming interface. The network can classify packets using existing DiffServ codepoint markings.

Question 669

An enterprise access edge receives DSCP-marked traffic from a source that must not be trusted to self-assign high priority. Which Junos networking action or protocol decision best addresses this requirement?

  1. Use a supported firewall-filter multifield classifier with forwarding-class action.
  2. Reclassify or remark untrusted ingress traffic according to a controlled classification policy.
  3. Assign the less critical packets a higher loss priority in classification.
  4. Differentiate forwarding class from packet-loss priority in Junos CoS policy.

Explanation

Correct Answer

B:

This action addresses Existing DSCP trust. Untrusted endpoint markings do not automatically obtain privileged forwarding treatment.

Incorrect Answers

A:

That action targets Multifield classification: Packets can be classified using header match fields rather than trusting DSCP alone. It does not directly resolve the stated Existing DSCP trust requirement.

C:

That action targets Loss-priority assignment: Congestion drop policy can distinguish the relative discard preference within a queue. It does not directly resolve the stated Existing DSCP trust requirement.

D:

That action targets CoS packet-loss priority: Service queue assignment and relative drop precedence can be controlled independently. It does not directly resolve the stated Existing DSCP trust requirement.

Question 670

A Junos network engineer takes this step: Reclassify or remark untrusted ingress traffic according to a controlled classification policy. Which outcome most directly follows?

  1. Packets can be classified using header match fields rather than trusting DSCP alone.
  2. Service queue assignment and relative drop precedence can be controlled independently.
  3. Untrusted endpoint markings do not automatically obtain privileged forwarding treatment.
  4. Congestion drop policy can distinguish the relative discard preference within a queue.

Explanation

Correct Answer

C:

This is the direct result of the Existing DSCP trust decision: Untrusted endpoint markings do not automatically obtain privileged forwarding treatment.

Incorrect Answers

A:

This outcome is associated with Multifield classification (Use a supported firewall-filter multifield classifier with forwarding-class action.), not the specified action.

B:

This outcome is associated with CoS packet-loss priority (Differentiate forwarding class from packet-loss priority in Junos CoS policy.), not the specified action.

D:

This outcome is associated with Loss-priority assignment (Assign the less critical packets a higher loss priority in classification.), not the specified action.

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