Networking - Programming Language (MCQ) questions for Q. 11937

Q.  Match the following List 1 to List 2

1. Label --------------- i) 3 bit
2. QoS ----------------- ii) 1 bit
3. S-field -------------- iii) 8 bit
4. TTL ------------------ iv) 20 bit

- Published on 23 Sep 15

a. 1- ii, 2-iii, 3-iv, 4-i
b. 1-iii, 2-iv, 3-i, 4-ii
c. 1-iv, 2-i, 3-ii, 4-iii
d. 1-i, 2-iv, 3-ii, 4-iii

ANSWER: 1-iv, 2-i, 3-ii, 4-iii


  • pragadeeswaran   -Posted on 25 May 21
    Excellent preparation of MCQ
  • Prajakta Pandit   -Posted on 28 Oct 15

    - The generic MPLS header has the following fields:

      1. Label
      2. QoS
      3. S-field
      4. TTL

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

    - It helps to find the correct output line by referring the table. It makes the routing quick.

    - MPLS acts as an index into an internal table.

    - Label is a 20 bit field which holds the index.

    - QoS (Quality of Service) is a 3 bit field which indicates the class of service.

    - S-field is a 1 bit field which relates to stacking of multiple labels in the hierarchical networks. If S-field hits a 0 , then packet is discarded.

    - TTL (Time to Live) is a 8 bit field that signifies the time that a packet still has before its life ends and is dropped. This ensures that packets do not live forever when entering and leaving the MPLS if there is a routing loop.

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