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Some applications will listen (listen) incoming connections (incoming) or do something to another computer. Programs like this model is called the application server. TSB program. created to provide services for other computers that request it. To truly understand the role of some components of family TCP / IP, of course, keep in mind what can be done at the network bases TCP / IP. Here I will give an explanation about some of the same practice commonly used with TCP / IP, okay next on:

• Telnet 

Telnet program provides the ability to do remote login. With this program, a user on a computer can log in (go) to another computer and act as if he was directly in front of the computer both the call. Access can be done from any network, provided the user has a valid permit does not matter in a local network or any network.

• File Transfer Protocol

Also called FTP. Allows a file on a computer system is copied to other systems. Users do not need a full user loginsebagai like telnet but need access permission (username, password and IP). If the connection has occurred, allowing FTP to copy files from a remote computer to a local computer that we use.
Simple Mail Transfer Protocol. Also called SMTP. Used to transfer electronic mail (e-mail). When using e-mail program, behind the scenes SMTP will connect itself to the remote computer and transfer the e-mail messages as well as an FTP program to transfer files, but we never realized the work "stealth" (SMTP) is.
Remote Procedure Call. Also called RPC. A set of functions that allow an application to communicate to another computer (server). RPC will provide the programming functions, return codes, predefined variables to support distributed computing.

• User Datagram Protocol

Also called UDP. The protocol bersifatconnectionless. UDP is the opposite of TCP connection-oriented. UDP is not reliable but it is designed for special purposes.

• Transmission Control Protocol. 

Also called TCP. Communication protocol that provides reliable data transfer. TCP is responsible for organizing and preparing (assembling) dilewatikan data from the layer (layer) application into a standard package and ensure that the data has been sent correctly.
Internet protocol. Also called IP. Section is responsible for moving packets of data that has been in-assembling the TCP or UDP (User datagram protocol) over the network. IP uses a set of unique addresses for each device in the network so that he can define and handle the travel path (route) and destination address.

• Domain Nname System. 

Also called DNS. Allows a computer with a common name are converted to specific network addresses. For example, a computer with a normal name DIMAS, can not be accessed by other computers on the same network or other networks, if there is no method to check the local machine name and replace it with a physical address (hardware) machine. DNS provides the conversion from local name to the physical address of a connection.