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CoS Features Flashcards

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  1. What is the primary purpose of Class of Service (CoS) in Junos OS?

    Answer: To prioritize traffic based on application or user needs

    CoS ensures that critical traffic, such as voice or video, gets higher priority compared to less critical traffic like file downloads.

  2. Which component in CoS is responsible for marking packets for priority handling?

    Answer: Classifier

    Classifiers identify packets and assign them to specific forwarding classes based on criteria like IP precedence or DSCP values.

  3. What is the role of a scheduler in Junos OS CoS?

    Answer: Manages bandwidth allocation and queue prioritization

    Schedulers determine how bandwidth is shared and prioritize traffic within queues.

  4. Which Junos CoS feature enforces traffic rates by dropping packets when limits are exceeded?

    Answer: Policing

    Policing enforces traffic rate limits by dropping or remarking packets that exceed the specified rate.

  5. What command is used to configure CoS classifiers in Junos OS?

    Answer: set class-of-service classifier

    The set class-of-service classifier command configures packet classification in Junos OS.

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Sources & references

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  1. learningportal.juniper.net — Test delivery, eligibility, exam format, score release, time limit, exam information · verified Nov 2026
  2. juniper.net — Passing score, score validity, renewal · verified Oct 2026