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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.
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