Which statement is/are true about MPLS packets?

Q.  Which of the following statements is/are true about MPLS packets?
- Published on 23 Sep 15

a. It creates a virtual circuit for transmission of data packets.
b. The label is used as an index for determining which outgoing line and new label is to be used. This new label contains the address of next MPLS router.
c. MPLS packet hits a router, that router will contact the next router where the packet will be going to generate a label for the flow.
d. Both b and c
e. Both a and c

ANSWER: The label is used as an index for determining which outgoing line and new label is to be used. This new label contains the address of next MPLS router.

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    Discussion

  • Prajakta Pandit   -Posted on 13 Oct 15

    - MPLS (Multi Protocol Label Switching) is a label that added in front of each packet and the routing is done on the basis of this label instead of the destination address.

    - The label is used as an index for determining which outgoing line and new label is to be used. This new label contains the address of next MPLS router.

    - This label acts as an index into an internal table. Because of that it becomes very easy to find the correct output line by referring the table.

    - In MPLS, each packet carries a virtual circuit identifier, called label.

    - MPLS is a data-carrying mechanism which emulates some properties of a circuit-switched network over a packet-switched network.

    - It can be used to carry many different kinds of traffic, including IP packets, as well as native ATM, SONET and Ethernet frames.

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