Application-to-Application Communication

TCP/IP was designed from the start to support client/server architecture.

Connection-oriented communication is used when applications need a sustained interchange of streams of data, and uses the Transmission Control Protocol (TCP).

Connectionless communication is used to exchange standalone messages, and uses the User Datagram Protocol (UDP).

TCP/IP Services and Protocols

File Transfer File Transfer Protocol (FTP)
Terminal Access Telnet protocol
Electronic Mail Simple Mail Transfer Protocol (SMTP)
World Wide Web (WWW) Hypertext Transfer Protocol (HTTP)
File Access Network File System (NFS)
(File access client, File server)
Usenet News Network News Transfer Protocol (NNTP)
Directory Services Domain Name System (DNS)
Network Management Simple Network Management Protocol (SNMP)

Application Services on a TCP/IP Network
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