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The Transmission Control Block is the set of variables that are maintained for each established TCP connection by a TCP implementation.
The Transmission Control Protocol is a protocol of the transport layer in the TCP/IP protocol suite that provides a reliable bytestream connection-oriented service on top of IP
The world wide web consortium was created to standardize the protocols and mechanisms used in the world wide web. It is thus focused on a subset of the application layer. See https://www.w3.org
The XWindow system and the associated protocols are defined in [SG1990]_
TLD
TLS
Transport Layer Security, defined in :rfc:`5246` is a cryptographic protocol that is used to provide communication security for Internet applications. This protocol is used on top of the transport service but a detailed description is outside the scope of this book.
UDP
unicast
User Datagram Protocol is a protocol of the transport layer in the TCP/IP protocol suite that provides an unreliable connectionless service that includes a mechanism to detect corruption
vnc
W3C
WAN
Wide Area Network
X11
X.25
XML