MPLS Questions

Note: If you are not sure about OSI Model, please read our MPLS tutorial.

Question 1

Explanation

MPLS operates at a layer that lies between traditional definitions of Layer 2 (data link layer) and Layer 3 (network layer), and thus is often referred to as a “layer 2.5” protocol.

Question 2

Explanation

MPLS supports IPv4, IPv6, IPX, AppleTalk at the network layer. MPLS supports Ethernet, Token Ring, FDDI, ATM, FR, PPP at the link layer.

MPLS uses label switching to forward packets over Ethernet. Labels are assigned to packets based on groupings or forwarding equivalence classes (FECs). The label is added between the Layer 2 and the Layer 3 header.