Virtualcircuit network is a connection service at the networ

Virtual-circuit network is a connection service at the network layer. Explain this network.

Solution

There are basically 3 types of networks :
1.Packet switched or datagram switched
2.Circuit switched
3.Virtual Circuit switched

--> In Datagram network:
   --packets or datagrams are sent from source to destination,
       -without any circuit/path creation
   --each packet follows its own path towards receiver
   --the service provided is \"hope\" based,
       -we can just hope that packet will reach the destination
       -and it will get all the necessary resources(bandwidth etc) to reach the destination

--> In Circuit switched network :
   --a physical connection is established between sender and receiver
   --service(delivery) is guaranteed
   --we have dedicated resources(switches/path/links/connection) to make this happen
   --eg. telephone connection ,
       --where each caller and receiver has dedicated cable connection

--> Virtual circuit network :
   -- as the name suggests , a circuit is there but it is not present physically
       --unlike we have in telephone connection
   -- data packets are tranferred from sender to receiver as in datagram network
   -- but the system now has virtually dedicated resources and path
   -- each packet will follow a fixed path and packets will reach in order
   -- this impression of having a physical path is created by time/frequency division of shared resources
   -- we have a pool of shared resources , allocated for one particular connection, when required
   ADVANTAGES :
       -- Ordered delivery of packtes
       -- Packets need not contain destination addres , so header is small