Which three QoS markers can be set using class-based marking? (Choose three.)
A.
discard-threshold
B.
qos-group
C.
mpls exp bits
D.
cos
E.
becn
F.
fecn
Explanation:
Class-based Marking supports following markers:
1) IP precedence
2) DSCP
3) QoS group
4) MPLS expertimental bits
5) ATM CLP bit
6) Frame Relay DE bit
7) 802.1Q/ISL cos/priority
Reference: IP QoS Introduction p.64