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a Service Data Unit is the unit information transferred between applications
segment
a segment is the unit of information transfer in the transport layer
SMTP
The Simple Mail Transfer Protocol is defined in :rfc:`821`
SNMP
The Simple Network Management Protocol is a management protocol defined for TCP/IP networks.
socket
A low-level API originally defined on Berkeley Unix to allow programmers to develop clients and servers.
spoofed packet
A packet is said to be spoofed when the sender of the packet has used as source address a different address than its own.
ssh
The Secure Shell (SSH) Transport Layer Protocol is defined in :rfc:`4253`
standard query
For DNS servers and resolvers, a standard query is a query for a `A` or a `AAAA` record. Such a query typically returns an IP address.
switch
A relay operating in the datalink layer.
SYN cookie
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.

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Glossary

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read-only
Source string location
../../glossary.rst:174
String age
5 years ago
Source string age
5 years ago
Translation file
locale/pot/glossary.pot, string 170