Which two of these parameters are used to determine a forwarding equivalence class? (Choose

two.

A.
IP prefix

B.
Layer 2 circuit

C.
RSVP request from CE for bandwidth reservation

D.
BGP MED value

Explanation:
A Forwarding Equivalence Class (FEC) is a class of packets that should be forwarded in the same
manner (i.e. over the same path). A FEC is not a packet, nor is it a label. A FEC is a logical entity
created by the router to represent a class (category) of packets. When a packet arrives at the
ingress router of an MPLS domain, the router parses the packet’s headers, and checks to see if
the packet matches a known FEC (class). Once the matching FEC is determined, the path and
outgoing label assigned to that FEC are used to forward the packet.
FECs are typically created based on the IP destinations known to the router, so for each different
destination a router might create a different FEC, or if a router is doing aggregation, it might
represent multiple destinations with a single FEC (for example, if those destinations are reachable
through the same immediate next hop anyway). The MPLS framework, however, allows for the
creation of FECs using advanced criteria like source and destination address pairs, destination
address and TOS, etc.