You are the lead network designer hired by Service Provider XYZ to deploy CoS functionality on
the core MPLS network (P routers). The goal of the network design is to provide a complete CoS
solution to all customers that purchase services such as dedicated internet access, MPLS L3VPN,
and L2VPN (pseudowire). Service Provider XYZ has these design requirements:
The network supports four service queues with equal treatment for delay, jitter, and packet loss.
Queues are numbered 0-3, where 0 is the default queue.
Three queues have one treatment.
One queue has either one or two treatments.
How would you design your solution to map the DSCP value properly so that the traffic is assigned

to the respective queues in the Service Provider XYZ MPLS core network?

A.
Classify traffic according to DSCP value into appropriate P router queues.

B.
Map the appropriate DSCP value into the EXP field based on the number of queues in the
MPLS P routers.

C.
Map the appropriate DSCP value into the EXP field based on the number of queues in the
MPLS PE routers.

D.
Based on the DSCP value, traffic is mapped automatically into appropriate queues in the MPLS
CE routers.