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The SYN cookies is a technique used to compute the initial sequence number (ISN)
TCB
The Transmission Control Block is the set of variables that are maintained for each established TCP connection by a TCP implementation.
TCP
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
TCP/IP
refers to the :term:`TCP` and :term:`IP` protocols
telnet
The telnet protocol is defined in :rfc:`854`
TLD
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.
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
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
unicast
a transmission mode where an information is sent from one source to one recipient
vnc
A networked application that allows to remotely access a computer's Graphical User Interface. See https://en.wikipedia.org/wiki/Virtual_Network_Computing
W3C