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JN0-102 · Question #269

What are two purposes of a forwarding class? (Choose two.)

The correct answer is C. to identify traffic that should receive common treatment D. to assign traffic to output queues. Forwarding classes are fundamental CoS components used to group traffic that requires similar treatment and to map this classified traffic to specific output queues for processing.

Junos OS Fundamentals

Question

What are two purposes of a forwarding class? (Choose two.)

Options

  • Ato identify traffic that should be dropped
  • Bto classify traffic
  • Cto identify traffic that should receive common treatment
  • Dto assign traffic to output queues

How the community answered

(65 responses)
  • A
    5% (3)
  • B
    2% (1)
  • C
    94% (61)

Why each option

Forwarding classes are fundamental CoS components used to group traffic that requires similar treatment and to map this classified traffic to specific output queues for processing.

Ato identify traffic that should be dropped

While traffic can eventually be dropped by CoS mechanisms, the primary purpose of a forwarding class itself is not to identify traffic for dropping, but rather to classify it for specific QoS treatment.

Bto classify traffic

Forwarding classes are the result of classification (where traffic is assigned to a class), not the act of classification itself. Classification is the process that puts traffic into a forwarding class.

Cto identify traffic that should receive common treatmentCorrect

A forwarding class identifies a group of traffic that should receive common CoS treatment, such as the same priority, loss characteristics, and delay, throughout the network.

Dto assign traffic to output queuesCorrect

Forwarding classes are directly mapped to output queues on network interfaces, ensuring that traffic within a specific class is directed to a particular queue for scheduling and congestion management.

Concept tested: Forwarding class purpose

Source: https://www.juniper.net/documentation/us/en/software/junos/cos/topics/concept/cos-forwarding-classes-overview.html

Topics

#forwarding class#class of service#traffic classification#output queues

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