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T
TACACS+
TACACS+ is an acronym for Terminal Access Controller Access Control System Plus. It is a networking
protocol which provides access control for routers, network access servers and other networked computing
devices via one or more centralized servers. TACACS+ provides separate authentication, authorization and
accounting services.
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.
TELNET enables the client to control the server and communicate with other servers on the network. To start
a Telnet session, the client user must log in to a server by entering a valid username and password. Then, the
client user can enter commands through the Telnet program just as if they were entering commands directly
on the server console.
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).
408 - Glossary
RocketLinx MP1204-XT User Guide: 2000644 Rev. A
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