Submitted By â€œ Adarsh Arya
Roll No. 4315
Methods of Switching
Â¢ Circuit Switching
Â¢ Message switching
Â¢ Packet Switching
Â¢ Seeking out and establish a physical path end-to-end.
Â¢ Circuit switching implies the need to first set up a dedicated end-to-end path for the connection before information transfer take place.
Â¢ Once the connection is made the only delay is propagation time.
Â¢ A store-and-forward network where the block of transfer is a complete message.
Â¢ Since messages can be quite large, this can cause:
â€œ buffering problems
â€œ high mean delay
Â¢ Each block is received in its entirety, inspected for errors, and retransmitted along the path to the destination. This implies buffering at the router and one transmission time per hop.
Â¢ A store-and-forward network where the block of transfer is a complete packet. A packet is a variable length block of data with a tight upper bound.
Packet Switched Networks
â€œ A setup stage is used to determine the end-to-end path before a connection is established.
â€œ No set up is needed.
â€œ Each packet contains information which allows the packet to be individually routed hop-by-hop through the network.
Datagram vs Virtual Circuit
â€œ Each datagram packet may be individually routed.
â€œ Virtual circuit set up is required.
â€œ All packets in a virtual circuit follow the same path.