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Application Protocols
Application protocols define the way in the TCP reliable service
can be used to achieve network-based computing. Because
applications can assume reliability, their protocols can be
relatively simple.
Most Internet application protocols use commands (and, in some
cases, responses) in a human-readable form. They normally also use
plain ASCII text (see later) where possible. This makes debugging
the protocols quite straightfoward in most cases.
Some application protocols include:
- Telnet
- provides remote login allowing a user to log into a remote
computer as though it was local. We examine Telnet in this
lecture.
- SMTP
- (Simple Mail Transfer Protocol) is the Internet electronic mail
delivery protocol. We look at electronic mail in the next
lecture.
- FTP
- (File Transfer Protocol) is used to copy files from one system
to another.
- HTTP
- (HyperText Transfer Protocol) is the protocol basis of the
World Wide Web.
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