What is the MPLS standard, and why is it often used by ISPs to move traffic from one customer site to another?
What will be an ideal response?
ANSWER: MPLS (multiprotocol label switching) was introduced by the IETF (Internet Engineering Task Force) in 1999. It has some of the strengths of ATM while avoiding its weaknesses, combining elements of both circuit-switching and packet-switching. As its name implies, MPLS enables multiple types of Layer 3 protocols to travel over any one of several connection-oriented Layer 2 protocols. MPLS supports IP and all the other Layer 3 and higher protocols used on TCP/IP networks. MPLS can operate over Ethernet frames, but is more often used with other Layer 2 protocols, like those designed for WANs. For these reasons, it's often used by ISPs on their own networks for moving traffic from one customer site to another, and it's becoming the solution of choice for many enterprises to connect their branch offices.
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