What are two purposes of a forwarding class? (Choose two.)
A.
to identify traffic that should be dropped
B.
to classify traffic
C.
to identify traffic that should receive common treatment
D.
to assign traffic to output queues
Explanation:
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The
primary functions of the forwarding plane are to forward packets and to implement advanced services.
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It is helpful to think of forwarding classes as output queues. In effect, the end result of classification is the identification of an output queue for a particular packet.
CoS packet classification assigns an incoming packet to an output queue based on the packet’s forwarding class. Each packet is associated with one of the following default forwarding classes:
Expedited forwarding (EF)—Provides a low-loss, low-latency, low- jitter, assured bandwidth, end-to-end service.
Assured forwarding (AF)—Provides a group of values you can define and includes four subclasses: AF1, AF2, AF3, and AF4, each with three drop probabilities: low, medium, and high.
Best effort (BE)—Provides no service profile. For the best effort forwarding class, loss priority is typically not carried in a class-of-service (CoS) value and random early detection (RED) drop profiles are more aggressive.
Network control (NC)—This class is typically high priority because it supports protocol control.
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