Difference Between Connection oriented vs Connection less
Connection-oriented means that a connection (a virtual link) must be established before data can be exchanged. This can guarantee that data will arrive, and in the same order it was sent. It guarantees delivery by sending acknowledgements back to the source when messages are received.
Example
TCP is an example of an connection-oriented transport protocol.
A common example of connection-oriented communication is a telephone call: you call, the ‘destination’ picks up the phone and acknowledges and you start talking (sending data). When a message or a piece of it doesn’t arrive, you say: “What!?” and the sender will retransmit the data.
Connectionless is the opposite of connection-oriented; the sender does not establish a connection before it sends data, it just sends without guaranteeing delivery.
Example
UDP is an example of an connectionless transport protocol.
Application Layers
Host A————————————Host B
Application layer——-data————Application layer
Presentation layer—–data————Presentation layer
Session layer———–data————Session layer
Transport layer—–segments——–Transport layer
Network layer ——packets———-Network layer
Data-link layer——-frames———–Data-link layer
Physical layer———–bits————-Physical layer