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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 68

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.

Question 671

An enterprise access edge receives DSCP-marked traffic from a source that must not be trusted to self-assign high priority. A colleague instead suggests: Differentiate forwarding class from packet-loss priority in Junos CoS policy. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

D:

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

Incorrect Answers

A:

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

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

Question 672

An enterprise network designer recommends: Reclassify or remark untrusted ingress traffic according to a controlled classification policy. Which situation most clearly calls for this action?

  1. An enterprise access edge receives DSCP-marked traffic from a source that must not be trusted to self-assign high priority.
  2. Two applications use one forwarding class but one should be more likely to be dropped under congestion.
  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

A:

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

Incorrect Answers

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.

C:

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.

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 673

An engineer suspects application packets are entering best-effort rather than their intended expedited forwarding class. Which Junos networking action or protocol decision best addresses this requirement?

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

Explanation

Correct Answer

D:

This action addresses Forwarding class inspection. The team can identify whether ingress classification assigned the expected traffic class.

Incorrect Answers

A:

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 inspection requirement.

B:

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 inspection requirement.

C:

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

Question 674

A Junos network engineer takes this step: Inspect the applicable CoS classifier and forwarding-class interface statistics. Which outcome most directly follows?

  1. The team can identify whether ingress classification assigned the expected traffic class.
  2. The network can classify packets using existing DiffServ codepoint markings.
  3. The traffic categories can be separated for different queue treatment.
  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 inspection decision: The team can identify whether ingress classification assigned the expected traffic class.

Incorrect Answers

B:

This outcome is associated with DSCP behavior aggregate classifier (Apply a supported behavior-aggregate DSCP classifier on the incoming interface.), 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 Ingress classifier attachment (Attach the classifier to the intended ingress interfaces in the applicable Junos hierarchy.), not the specified action.

Question 675

An engineer suspects application packets are entering best-effort rather than their intended expedited forwarding class. A colleague instead suggests: Apply a supported behavior-aggregate DSCP classifier on the incoming interface. Which corrective approach most directly addresses the original issue?

  1. Apply a supported behavior-aggregate DSCP classifier on the incoming interface.
  2. Inspect the applicable CoS classifier and forwarding-class interface statistics.
  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

B:

This corrective choice addresses Forwarding class inspection. The team can identify whether ingress classification assigned the expected traffic class.

Incorrect Answers

A:

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

C:

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

D:

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

Question 676

An enterprise network designer recommends: Inspect the applicable CoS classifier and forwarding-class interface statistics. 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. An engineer suspects application packets are entering best-effort rather than their intended expedited forwarding class.
  4. A correct DSCP classifier exists under class-of-service but no interfaces refer to it.

Explanation

Correct Answer

C:

This case requires the Forwarding class inspection action. The team can identify whether ingress classification assigned the expected traffic class.

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 Define appropriate CoS forwarding classes and map them to supported distinct queues. The traffic categories can be separated for different queue treatment.

D:

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.

Question 677

A network assigns drop precedence to packets in addition to service class, but the operator assumes they are the same attribute. Which Junos networking action or protocol decision best addresses this requirement?

  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. 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

D:

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

Incorrect Answers

A:

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

B:

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 CoS packet-loss priority 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 CoS packet-loss priority requirement.

Question 678

A Junos network engineer takes this step: Differentiate forwarding class from packet-loss priority in Junos CoS policy. Which outcome most directly follows?

  1. Service queue assignment and relative drop precedence can be controlled independently.
  2. Packets can be classified using header match fields rather than trusting DSCP alone.
  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

A:

This is the direct result of the CoS packet-loss priority decision: Service queue assignment and relative drop precedence can be controlled independently.

Incorrect Answers

B:

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

C:

This outcome is associated with Existing DSCP trust (Reclassify or remark untrusted ingress traffic according to a controlled classification 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.

Question 679

A network assigns drop precedence to packets in addition to service class, but the operator assumes they are the same attribute. A colleague instead suggests: Use a supported firewall-filter multifield classifier with forwarding-class action. Which corrective approach most directly addresses the original issue?

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

Explanation

Correct Answer

B:

This corrective choice addresses CoS packet-loss priority. Service queue assignment and relative drop precedence can be controlled independently.

Incorrect Answers

A:

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

D:

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

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.

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