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.
If your design includes eight CoS queues on the Service Provider XYZ MPLS PE router ingress
(CE facing) interface, how will customer traffic be classified as it enters the MLS P routers?

A.
The eight CoS queues in the MPLS P router are remapped to the eight CoS queues.

B.
Traffic is classified on the MPLS PE routers on core facing interface. The DSCP value is
mapped into EXP field where multiple EXP settings (2+) will be assigned to a single queue
throughout the MPLS P routers.

C.
Discard the traffic from the eight CoS queues that does not match the four CoS queues of the
MPLS P routers.

D.
The 8 CoS queues in the MPLS P router are remapped to four 4 flow-label queues.