This is where routing and packet forwarding takes place. The Transmission Control Protocol-the TCP in TCP/IP-operates at this layer. This layer is concerned with such things as transfer rates and data volumes. This is the layer that moves data around the network in a coordinated way. This layer involves itself with such matters as the initiation of a connection, handshaking, timeouts, and the breaking of connections that are no longer required. A session is a network connection between two or more devices.
Encryption and decryption take place at this layer. This makes sure the data is in the right format or state as it moves to and from the network format. It provides information to the computer user and receives information back from them.
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