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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 66

Question 650

A Junos network engineer takes this step: Apply a supported behavior-aggregate DSCP classifier on the incoming interface. Which outcome most directly follows?

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

Explanation

Correct Answer

C:

This is the direct result of the DSCP behavior aggregate classifier decision: The network can classify packets using existing DiffServ codepoint markings.

Incorrect Answers

A:

This outcome is associated with Ingress classifier attachment (Attach the classifier to the intended ingress interfaces in the applicable Junos hierarchy.), not the specified action.

B:

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

Question 651

Ingress IP packets carry standardized DSCP markings that must map into Junos forwarding classes. A colleague instead suggests: Define appropriate CoS forwarding classes and map them to supported distinct queues. Which corrective approach most directly addresses the original issue?

  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

D:

This corrective choice addresses DSCP behavior aggregate classifier. The network can classify packets using existing DiffServ codepoint markings.

Incorrect Answers

A:

That alternative applies to Ingress classifier attachment instead. Received packets can actually be mapped to forwarding classes by the policy.

B:

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

C:

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

Question 652

An enterprise network designer recommends: Apply a supported behavior-aggregate DSCP classifier on the incoming interface. Which situation most clearly calls for this action?

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

Explanation

Correct Answer

A:

This case requires the DSCP behavior aggregate classifier action. The network can classify packets using existing DiffServ codepoint markings.

Incorrect Answers

B:

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.

C:

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 653

Traffic from an unmarked application must be assigned to a forwarding class based on source, destination and transport port. Which Junos networking action or protocol decision best addresses this requirement?

  1. Differentiate forwarding class from packet-loss priority in Junos CoS policy.
  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. Use a supported firewall-filter multifield classifier with forwarding-class action.

Explanation

Correct Answer

D:

This action addresses Multifield classification. Packets can be classified using header match fields rather than trusting DSCP alone.

Incorrect Answers

A:

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 Multifield classification requirement.

B:

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

Question 654

A Junos network engineer takes this step: Use a supported firewall-filter multifield classifier with forwarding-class action. Which outcome most directly follows?

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

Explanation

Correct Answer

A:

This is the direct result of the Multifield classification decision: Packets can be classified using header match fields rather than trusting DSCP alone.

Incorrect Answers

B:

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

C:

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

D:

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

Question 655

Traffic from an unmarked application must be assigned to a forwarding class based on source, destination and transport port. A colleague instead suggests: Assign the less critical packets a higher loss priority in classification. Which corrective approach most directly addresses the original issue?

  1. Assign the less critical packets a higher loss priority in classification.
  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. Reclassify or remark untrusted ingress traffic according to a controlled classification policy.

Explanation

Correct Answer

B:

This corrective choice addresses Multifield classification. Packets can be classified using header match fields rather than trusting DSCP alone.

Incorrect Answers

A:

That alternative applies to Loss-priority assignment instead. Congestion drop policy can distinguish the relative discard preference within a queue.

C:

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

D:

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

Question 656

An enterprise network designer recommends: Use a supported firewall-filter multifield classifier with forwarding-class action. 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. An enterprise access edge receives DSCP-marked traffic from a source that must not be trusted to self-assign high priority.
  3. Traffic from an unmarked application must be assigned to a forwarding class based on source, destination and transport port.
  4. A network assigns drop precedence to packets in addition to service class, but the operator assumes they are the same attribute.

Explanation

Correct Answer

C:

This case requires the Multifield classification action. Packets can be classified using header match fields rather than trusting DSCP alone.

Incorrect Answers

A:

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.

B:

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.

D:

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.

Question 657

Voice and bulk traffic receive different forwarding requirements but are currently mapped into the same egress queue. 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. Inspect the applicable CoS classifier and forwarding-class interface statistics.
  3. Apply a supported behavior-aggregate DSCP classifier on the incoming interface.
  4. Define appropriate CoS forwarding classes and map them to supported distinct queues.

Explanation

Correct Answer

D:

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

Incorrect Answers

A:

That action targets Ingress classifier attachment: Received packets can actually be mapped to forwarding classes by the policy. It does not directly resolve the stated Forwarding-class mapping requirement.

B:

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 Forwarding-class mapping requirement.

C:

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

Question 658

A Junos network engineer takes this step: Define appropriate CoS forwarding classes and map them to supported distinct queues. Which outcome most directly follows?

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

Explanation

Correct Answer

A:

This is the direct result of the Forwarding-class mapping decision: The traffic categories can be separated for different queue treatment.

Incorrect Answers

B:

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 DSCP behavior aggregate classifier (Apply a supported behavior-aggregate DSCP classifier on the incoming interface.), not the specified action.

D:

This outcome is associated with Ingress classifier attachment (Attach the classifier to the intended ingress interfaces in the applicable Junos hierarchy.), not the specified action.

Question 659

Voice and bulk traffic receive different forwarding requirements but are currently mapped into the same egress queue. A colleague instead suggests: Attach the classifier to the intended ingress interfaces in the applicable Junos hierarchy. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

B:

This corrective choice addresses Forwarding-class mapping. The traffic categories can be separated for different queue treatment.

Incorrect Answers

A:

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

C:

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

D:

That alternative applies to Ingress classifier attachment instead. Received packets can actually be mapped to forwarding classes by the policy.

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.

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