PeteDotCom -> Networking -> TCP/IP -> Layers ->   APPLICATION The application layer of the TCP/IP protocol is responsible for handling the details of computer applications, such as FTP programs which operate at this layer. With the help of the application layer, files can be downloaded and uploaded efficiently. TRANSPORT The transport of the TCP/IP protocol is responsible the transfer of data between two computers or devices. The job of this layer is to slice the data up into small pieces of TCP segments, and add a header with a sequence number for that segment and then pass the segment to the IP layer to be transferred to the destination computer or device. INTERNET The internet layer of the TCP/IP protocol is responsible for IP datagrams. This layer is primarily concerned with the handling of information about the routers that are available on the internet and the path that can be taken from one router to another. NETWORK The Network layer of the TCP/IP protocol is responsible for looking after the movement of IP datagrams through the physical network/internet. This layer is also responsible for the mapping of the IP addresses to the physical address. PHYSICAL LAYER The physical layer is basically the physical wires or the medium in which the data is transferred.