What is the difference between Virtual Circuit and Datagram?

Q.  What is the difference between Virtual Circuit and Datagram?
- Published on 23 Sep 15

a. The quality of service is easy in Virtual Circuit while it is difficult in Datagram.
b. In the connection oriented service, a connection is called as Virtual Circuit while in the connectionless service, the independent packets are called as Datagrams.
c. The services are independent in Virtual Circuit but that won't be so in Datagrams.
d. Both a and b
e. Both b and c

ANSWER: In the connection oriented service, a connection is called as Virtual Circuit while in the connectionless service, the independent packets are called as Datagrams.

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    Discussion

  • Prajakta Pandit   -Posted on 14 Oct 15

    - Datagram :

        - In datagram two packets of the same user pair can travel along different routes.
        - The packets can arrive out of sequence.
        - Packet contains full source and destination addresses.
        - Each route occupies routing table entries .
        - It doesn't require connection set up.

    - Virtual Circuit

        - In virtual circuit, all packets of the same virtual circuit travel along the same path.
        - Packet sequencing is guaranteed in a virtual circuit network.
        - Packets contain a short virtual circuit id (VCI).
        - Each virtual circuit occupies routing table entries.
        - It requires virtual circuit setup.

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