internet protocol stack contains 5 layers i)application layer ii)transport layer iii)network layer iv)link layer v)physical layer a) Route selection is done in network layer b)Provide user services such as e-mail and file transfer is done in application layer c) Mechanical and electrical interface is done in physical layer Solution internet protocol stack contains 5 layers i)application layer ii)transport layer iii)network layer iv)link layer v)physical layer a) Route selection is done in network layer b)Provide user services such as e-mail and file transfer is done in application layer c) Mechanical and electrical interface is done in physical layer.