Define connection oriented and connectionless transmission with examples.

Answer

Connection oriented transmission

In connection oriented transmission the source first makes a connection with the destination before transmitting the packet or data. When the connection is established data is sent over the same path during the communication. This kind of communication is often reliable and guarantees that data will arrive in proper sequence. In Circuit mode communication the public telephone network, ISDN and SONET/SDH are examples of connection-oriented communication.

Packet mode communication may also be connection-oriented, and is called virtual circuit mode communication. In this case when the connection is established, a sequence of packets from the same source to the same destination can be sent one after another. They are sent on the same path in sequential order. A packet is logically connected to the packet traveling before it and to the packet after it. When all packets of message have been delivered, the connection is terminated.

 

Connectionless transmission

The connectionless transmission is basically a packet-mode communication, also known as datagram communication, in which data is sent from one end point to another without prior arrangement, and no guarantees are provided. In datagram switching, each data packet must contain complete address information, since packets are routed individually. The packets may be delivered along different paths and without any guarantees, according to a best-effort policy. Internet is the example of this type of communication.