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Appendix A: Glossary of Web-based Management
Tag Priority
—Tag Priority is a 3-bit field storing the priority level for the 802.1Q frame.
TCP
—TCP is an acronym for Transmission Control Protocol. It is a communications protocol that uses the Internet Protocol (IP) to
exchange the messages between computers.
The TCP protocol guarantees reliable and in-order delivery of data from sender to receiver and distinguishes data for multiple
connections by concurrent applications (for example, Web server and e-mail server) running on the same host.
The applications on networked hosts can use TCP to create connections to one another. It 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.
Common network applications that use TCP include the World Wide Web (WWW), e-mail, and File Transfer Protocol (FTP).
TELNET
—TELNET is an acronym for TELetype NETwork. It is a terminal emulation protocol that uses the Transmission Control
Protocol (TCP) and provides a virtual connection between TELNET server and TELNET client.
TFTP
—TFTP is an acronym for Trivial File Transfer Protocol. It is transfer protocol that uses the User Datagram Protocol (UDP) and
provides file writing and reading, but it does not provide directory service and security features.
ToS
—ToS is an acronym for Type of Service. It is implemented as the IPv4 ToS priority control. It is fully decoded to determine the
priority from the 6-bit ToS field in the IP header. The most significant 6 bits of the ToS field are fully decoded into 64 possibilities,
and the singular code that results is compared against the corresponding bit in the IPv4 ToS priority control bit (0–63).
TLV
—TLV is an acronym for Type Length Value. A LLDP frame can contain multiple pieces of information. Each of these pieces of
information is known as TLV.
TKIP
—TKIP is an acronym for Temporal Key Integrity Protocol. It used in WPA to replace WEP with a new encryption algorithm.
TKIP comprises the same encryption engine and RC4 algorithm defined for WEP. The key used for encryption in TKIP is 128 bits
and changes the key used for each packet.
UDP
—UDP is an acronym for User Datagram Protocol. It is a communications protocol that uses the Internet Protocol (IP) to
exchange the messages between computers.
UDP is an alternative to the Transmission Control Protocol (TCP) that uses the Internet Protocol (IP). Unlike TCP, UDP does not pro-
vide the service of dividing a message into packet datagrams, and UDP doesn't provide reassembling and sequencing of the pack-
ets. This means that the application program that uses UDP must be able to make sure that the entire message has arrived and is
in the right order. Network applications that want to save processing time because they have very small data units to exchange
may prefer UDP to TCP.
UDP provides two services not provided by the IP layer. It provides port numbers to help distinguish different user requests and,
optionally, a checksum capability to verify that the data arrived intact.
Common network applications that use UDP include the Domain Name System (DNS), streaming media applications such as IPTV,
Voice over IP (VoIP), and Trivial File Transfer Protocol (TFTP).
UPnP
—UPnP is an acronym for Universal Plug and Play. The goals of UPnP are to allow devices to connect seamlessly and to
simplify the implementation of networks in the home (data sharing, communications, and entertainment) and in corporate envi-
ronments for simplified installation of computer components
User Priority
—User Priority is a 3-bit field storing the priority level for the 802.1Q frame. It is also known as PCP.
