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Transmission Control Protocol (TCP)
A set of rules used along with the Internet Protocol (IP) to send data in the form of
message units between computers over the Internet. While IP handles the actual
delivery of the data, TCP handles keeping track of the individual units of data (called
packets) that a message is divided into for efficient routing through the Internet.
For example, when an HTML file is sent to you from a web server, the TCP program
layer in that server divides the file into one or more packets, numbers the packets, and
then forwards them individually to the IP program layer. Although each packet has the
same destination IP address, it may get routed differently through the network. At the
other end (the client program in your computer), TCP reassembles the individual
packets and waits until they have arrived to forward them to you as a single file.
TCP is known as a connection-oriented protocol, which means that a connection is
established and maintained until such time as the message or messages to be exchanged
by the application programs at each end have been exchanged. TCP is responsible for
ensuring that a message is divided into the packets that IP manages and for
reassembling the packets back into the complete message at the other end. In the Open
Systems Interconnection (OSI) communication model, TCP is in layer 4, the Transport
Layer.
Transport Layer Security (TLS)
A protocol that ensures privacy between communicating applications and their users on
the Internet. When a server and client communicate, TLS ensures that no third party
may eavesdrop or tamper with any message. TLS is the successor to the Secure Sockets
Layer (SSL).
Trivial File Transfer Protocol (TFTP)
An Internet software utility for transferring files that is simpler to use than the File
Transfer Protocol (FTP) but less capable. It is used where user authentication and
directory visibility are not required. TFTP uses the User Datagram Protocol (UDP)
rather than the Transmission Control Protocol (TCP). TFTP is described formally in
Request for Comments (RFC) 1350.
TTY port redirection
The process of establishing a connection between the host and networked serial devices
by creating a local TTY port on the host.
The TTY port appears and behaves as a
local port to the PC or server.
See also RealPort.