3Com 3C17300A Implementation Guide - Page 111

111 DHCP Dynamic Host Control Protocol. A protocol that lets you centrally manage and automate the assignment of Internet Protocol (IP) addresses in an organization's network. DNS Domain Name System. This system maps a numerical Internet Protocol (IP) address to a more meaningful and easy-to-remember name. When you need to access another device on your network, you enter the name of the device, instead of its IP address. DSCP DiffServ Code Point (DSCP) - is the traffic prioritization bits within an IP header that are encoded by certain applications and/or devices to indicate the level of service required by the packet across a network. DUD Disconnect Unauthorized Device. A port security feature that disables a port if an unauthorized client device transmits data on it. endstation A computer, printer or server that is connected to a network. Ethernet A LAN specification developed jointly by Xerox, Intel and Digital Equipment Corporation. Ethernet networks use CSMA/CD to transmit packets at a rate of 10 Mbps over a variety of cables. Ethernet address See MAC address. Fast Ethernet An Ethernet system that is designed to operate at 100Mbps. forwarding The process of sending a packet toward its destination using a networking device. Forwarding Database See Switch Database. filtering The process of screening a packet for certain characteristics, such as source address, destination address, or protocol. Filtering is used to determine whether traffic is to be forwarded, and can also prevent unauthorized access to a network or network devices. flow control A mechanism that prevents packet loss during periods of congestion on the network. Packet loss is caused when devices send traffic to an already overloaded port on a Switch. Flow control prevents packet loss by inhibiting devices from generating more traffic until the period of congestion ends. FTP File Transfer Protocol. A protocol based on TCP/IP for reliable file transfer.