Terminology used in network are as follows:

(a) Unicast:

unicast is defined as connection between two computers i.e. between a computer and a server.

(b) Multicast:

multicast is defined as connection between many computers i.e lan or voice chat eg. yahoo.

(c) Broadcast:

broadcast is defined as connection between all computer or networking devices.

(d) Simplex:

it is a one way communication and it is not widley used as it is a single way communication.

(e) Duplex:

it is a two way communication and it is classified as half and full duplex.

(1)Half duplex can be explained as consider there are two systems A and B, if A communicates with B, B has to wait till A completes.

(2)Full duplex can be explained as consider there are two systems A and B, both can communicate at the same time.