Networking - Programming Language (MCQ) questions for Q. 11974

Q.  Match the following List 1 to List 2

1. Open message --------------- i. To close an active session  
2. Update message ------------ ii. Opens a BGP communications session
3. Keep-alive message -------- iii. Provide routing updates to other BGP system
4. Notification message ------- iv.  Notifies BGP peers device is active
- Published on 19 Oct 15

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

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

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    Discussion

  • Prajakta Pandit   -Posted on 26 Oct 15

    - BGP (Border Gateway Protocol) is an exterior routing protocol. It is based on the routing method called path vector routing.

    - This principle is used because the distance vector routing and link state routing do not prove to be good candidates interautonomous system routing.

    - Types of Messages :

    - BGP uses four different types of messages.

      1. Open message
      2. Update message
      3. Keep alive message
      4. Notification message

    - Open message : opens a BGP communications session between peers and this is the first message sent by each side after a transport protocol connection is established.

    - Update message : It is used to provide routing updates to other BGP systems, it allows router to construct a consistent view of the network.

    - Keep alive message : It notifies BGP peers that a device is active. Keep alive is mostly sent to keep the sessions from expiring.

    - Notification message : The notification message is sent when an error condition is detected. It is used to close an active session and to inform any connected routers of why the session is being closed.

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