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The telnet protocol is defined in :rfc:`854`
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TLD
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A Top-level domain name. There are two types of TLDs. The ccTLD are the TLD that correspond to a two letters :term:`ISO-3166` country code. The gTLD are the generic TLDs that are not assigned to a country.
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TLS
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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.
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UDP
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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
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unicast
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a transmission mode where an information is sent from one source to one recipient
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VNC
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vnc
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A networked application that allows to remotely access a computer's Graphical User Interface. See https://en.wikipedia.org/wiki/Virtual_Network_Computing
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W3C
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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
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WAN
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Wide Area Network
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X.25
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A wide area networking technology using virtual circuits that was deployed by telecommunication operators.
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X11
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The XWindow system and the associated protocols are defined in [SG1990]_
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