What is the default number of classes that Assured Forwarding (AF) have?
A.
1
B.
3
C.
4
D.
6
E.
8
Explanation:
The Assured Forwarding PHB is identified based on the following parameters:
Guarantees a certain amount of bandwidth to an AF class
Allows access to extra bandwidth, if available
Packets requiring AF PHB should be marked with DSCP value “aaadd0” where “aaa” is the number of the class and “dd” is the drop probability There are four standard-defined AF classes. Each class should be treated independently and have bandwidth allocated based on the QoS policy.
Source: Cisco IP QoS Introduction, Page 49
