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which statement is correct?

Referring to the exhibit, traffic handled by the s-1 scheduler is out of profile. Assuming bandwidth
is available in this scenario, which statement is correct?

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A.
Traffic handled by the s-1 scheduler is serviced immediately after traffic being serviced by the s-4 scheduler.

B.
Traffic handled by the s-1 scheduler is serviced immediately before traffic being serviced by the s-4 scheduler.

C.
Traffic handled by the s-1 scheduler is serviced immediately before traffic being serviced by the s-2 scheduler.

D.
Traffic handled by the s-1 scheduler is serviced immediately after traffic being serviced by the s-2 scheduler.

4 Comments on “which statement is correct?

  1. muu says:

    why not C ?

    if i am right the servicing order:
    (stricht-high)
    high
    medium-high
    medium-low
    low

    So s-1 is serviced immediately (first) , before the s-2 being serviced (because is serviced second)

    what do you think?




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    1. lalaversa says:

      Correct answer is A.
      In this case s-1 scheduler is out of profile (no the other s-X)
      From Pablo “web” indication you can read:
      When the transmitted amount is less than the allocated amount, the queue is considered to be in profile. A queue is out of profile when its transmitted amount is larger than its allocated amount.

      The Junos OS performs priority queuing using the following steps:

      The software locates all high-priority queues that are currently in profile. These queues are serviced first in a weighted round-robin fashion.

      The software locates all medium-high priority queues that are currently in profile. These queues are serviced second in a weighted round-robin fashion.

      The software locates all medium-low priority queues that are currently in profile. These queues are serviced third in a weighted round-robin fashion.

      The software locates all low-priority queues that are currently in profile. These queues are serviced fourth in a weighted round-robin fashion.

      The software locates all high-priority queues that are currently out of profile and are not rate limited. The weighted round-robin algorithm is applied to these queues for servicing.

      The software locates all medium-high priority queues that are currently out of profile and are not rate limited. The weighted round-robin algorithm is applied to these queues for servicing.

      The software locates all medium-low priority queues that are currently out of profile and are not rate limited. The weighted round-robin algorithm is applied to these queues for servicing.

      The software locates all low-priority queues that are currently out of profile and are also not rate limited. These queues are serviced last in a weighted round-robin manner.




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      1. dix says:

        Because traffic S1 is out of profile, it is served after that another queues are served, in this case S4 has the low priority and it is the last one in be served, then the traffic S1 is served (out of profile) after the traffic S4 (in profile).




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