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which order is the packet processed?

A packet enters the router and is subject to ingress’s processing. In which order is the packet
processed?

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A.
Policer > BA classifier > multifield classifier > forwarding policy

B.
Multifield classifier > BA classifier > policer > forwarding policy

C.
BA classifier > multifield classifier > policer > forwarding policy

D.
Forwarding policy > BA classifier > multifield classifier > policer

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One Comment on “which order is the packet processed?

  1. ketan2809 says:

    Answer C

    Ingress CoS Processing

    1. BA classification: Packets arriving at the router are first subjected to the BA
    classification stage. This stage sets the forwarding class and packet loss priority (PLP)
    using any of the supported BA classifier types, including IP precedence, DSCP, Institute
    of Electrical and Electronics Engineers (IEEE) 802.1P, and so on.
    2. Multifield classification: The next processing stage is multifield classification. Here a
    firewall filter can be defined to match against numerous packet fields, incoming
    interfaces, and so on, to set the forwarding class or PLP, or to override the values set
    during BA classification.
    3. Ingress policing: When desired, a firewall or interface-level policer can be applied to
    limit matching traffic by discarding, by reclassification, or by marking excess traffic with
    a loss priority of high. This means that, in the event of congestion, a random early
    detection (RED) profile can be used to more aggressively drop PLP high traffic.
    4. Forwarding policy: The last ingress processing stage is forwarding policy. This policy can
    alter the existing forwarding class or PLP setting, and it can be used to select a
    forwarding next hop based on a forwarding class, a feature called class-of-service–
    based forwarding (CBF).




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