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Glossary t

Nov 26,2008 by alperen

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T1 circuit: See [T/1 line]

T1 line: A 4-wire circuit that runs at 1.544 Mbps and is composed of 24 channels at 64 Kbps each, plus 8 Kbps of management overhead.

TACACS+: Cisco proprietary protocol used between routers and AAA servers to exchange AAA information.

TCP ACK flag: A single bit inside the TCP header that signals whether a segment is anything except the first segment in a new TCP connection.

TCP connection: An agreement between application processes on two computers to use TCP to send data. The connection is created by sending three overhead messages between the two computers, which initialize the values of the fields in the TCP header.

TCP connection establishment: A process by which two computers exchange three TCP segments to initialize TCP header fields, thereby allowing an application program on each computer to communicate with an application program on the other computer, using TCP.

TCP destination port: A field inside the TCP header that identifies the specific application program on the receiving computer that should ultimately receive the data in the segment.

TCP port: A number that identifies an application process on a computer. TCP uses a source port and a destination port so that the receiver of a TCP segment can look at the destination port number and know to which application to give the data.

TCP segment: A TCP header, along with encapsulated data, created by TCP on behalf of an application.

TCP source port: A field inside the TCP header that identifies the specific application program on the sending computer that created the data in the segment.

TCP SYN flag: A single bit inside the TCP header that signals whether a segment is either the first or second segment in a new TCP connection. The first segment in a new connection has the SYN flag set to binary 1, and no other TCP flags set.

TCP/IP (Transmission Control Protocol/Internet Protocol): A public networking model that has widespread acceptance. The creation and management of the standards included in TCP/IP are performed by the Internet Engineering Task Force (IETF).

TCP/IP host name: See [host name]

telco: Jargon for telephone company.

telco switch: Equipment owned by the telephone company and installed in a CO.

telephone company (telco): See [telco]

top-level domain: The last suffix in any TCP/IP host name, which either identifies the purpose of that domain (such as .com for commercial enterprises), or the country of origin for the organization.

trailer: A bunch of bits placed after data prior to transmission. The bits allow a protocol to have a place to include information along with the user data to accomplish the function of the protocol.

Transmission Control Protocol/Internet Protocol (TCP/IP): See [TCP/IP]

transmission speed: The rate at which bits are transmitted over a WAN link, either in bits per second, kilobits per second, megabits per second, or gigabits per second.

trunk: Either refers to a VLAN trunk or to an Ethernet segment between two switches.

twisted pair: A pair of wires that are twisted together to significantly reduce electromagnetic interference.

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