Give two example computer applications for which connection-oriented service is appropriate. Now give two examples for which connectionless service is best.

A connection-oriented service is a data transfer mechanism used at the session layer. Connectionless service is an in-data communication that is used to convey data at the OSI model's transport layer.

What is a connection-oriented service?

A connection-oriented service is a data transfer mechanism used at the session layer. Unlike its opposite, connectionless service, connection-oriented service necessitates the establishment of a session connection between the sender and recipient, similar to a phone conversation. Although not all connection-oriented protocols are considered reliable, this method is generally thought to be more reliable than a connectionless service.

What is a connection-less service?

Connectionless service is a notion in data communications that is used to convey data at the OSI model's transport layer (layer 4). It refers to data transmission between two nodes or terminals in which data is transferred from one node to the other without first confirming that the destination is accessible and ready to accept the data. There is no need for a session connection between the sender and the receiver; the sender just begins delivering data.

Telnet, rlogin, and FTP are examples of services that leverage connection-oriented transport services. And Connectionless services include User Datagram Protocol (UDP), Internet Protocol (IP), and Internet Control Message Protocol (ICMP).

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