How does transmission take place across networks?

Switching techniques are used for­ transmitting data across networks. The switching techniques used are as follows:

1. Circuit switching — A complete physical connection is established between the sender and the receiver and then data are transmitted from the source computer to the destination computer.
2. Message switching — In this form of switching no physical copper path is established in advance between sender and receiver. Instead when the sender has a block of data to be sent, it is stored in first switching office, then forwarded later, one jump at a time until the data is delivered to the destination computer.
3. Packet switching — A fixed size of packet which can be transmitted across the network is specified. The message is divided into packets and packets travel across hops.