Glossary
static route | A |
| chosen by dynamic routing protocols. |
subnet address | The subnet portion of an IP address. In a subnetted network, the host portion of an IP |
| address is split into a subnet portion and a host portion using an address (subnet) mask. |
| This allows a site to use a single IP network address for multiple physical networks. |
subnet mask | A number that identifies the subnet portion of a network address. The subnet mask is a |
| |
| subnet portions of the address. |
TCP | Transmission Control Protocol. An Internet standard transport layer protocol defined in |
| STD 7, RFC 793. It is |
Telnet | Virtual terminal protocol in the Internet suite of protocols. Allows the user of one host |
| computer to log into a remote host computer and interact as a normal terminal user for that |
| host. |
terminal emulation | Software that allows a PC to mimic the signals of a specific type of terminal, such as a |
| VT100 or 3270, to communicate with a device requiring that terminal interface. |
TFTP | Trivial File Transfer Protocol. A standard TCP/IP protocol that allows simple file transfer to |
| and from a remote system without directory or file listing. TFTP is used when FTP is not |
| available. |
TraceRoute | A program that lists the hosts in the path to a specified destination. |
trap (SNMP) | A notification message to the SNMP manager when an unusual event occurs on a network |
| device, such as a reinitialization. |
UDP | User Datagram Protocol. A TCP/IP protocol describing how messages reach application |
| programs within a destination computer. |
unicasting | In ATM, the sending of a Protocol Data Unit (PDU) to a single destination. |
upstream | In the direction of the telephone network. |
XTACACS | See Authentication Server. |
VNID | Virtual Network ID. |
WAN | Wide Area Network. A network that spans a large geographic area. |
January 1999 |