Answer :
The four layers of the TCP/IP suite are: Application, Transport, Internet, and Network interface layers.
Application layer: Basically, this layer provides applications the ability to access the services of other layers. It defines protocols that applications should use to exchange data. Examples of protocols, in this layer are HTTP, FTP, and SMTP.
Transport layer: Transport layer is concerned with the transmission of data. The only protocols that operate in this layer are UDP and TCP.
Internet layer: This layer is responsible for addressing, packaging and routing functions. It contains the packet construct that will be transmitted. Core protocols in this layer include IP, ARP, ICMP, and IGMP.
Network layer: It is responsible for placing TCP/IP packets on the network medium and receiving the same packets off the network. It is sometimes referred to as the IP suite.