In the 5-layer reference model used with the TCP/IP Internet protocols, what is the purpose of each of the five layers?

What will be an ideal response?

The 5-layers of TCP/IP and their purposes are given as follows:
? Layer 1 (Physical): Protocols in the Physical layer specify details about the underlying
transmission medium and the associated hardware.
? Layer 2 (Network Interface): Protocols in the Network Interface layer specify details about
communication between higher layers of protocols and the underlying network.
? Layer 3 (Internet): Protocols in the Internet layer form the fundamental basis for the Internet.
Layer 3 protocols specify communication between two computers across the Internet
? Layer 4 (Transport): Protocols in the Transport layer provide for communication from an
application program on one computer to an application program on another.
? Layer 5 (Application): Protocols in the top layer of the TCP/IP stack specify how a pair of
applications interacts when they communicate.