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dual-attached stations (DAS) Stations on an FDDI network that are attached to both cables for connection redundancy and fault tolerance.

dumb terminal A keyboard and monitor that send keystrokes to a central processing computer (typically a mainframe or minicomputer) that returns screen displays to the monitor. The unit has no processing power of its own, hence the moniker “dumb.”

duplexed hard drives Two hard drives to which identical information is written simultaneously. A dedicated controller card controls each drive. Used for fault tolerance.

duplicate server Two servers that are identical for use in clustering. dynamic ARP table entries See dynamic entry.

dynamic entry An entry made in the ARP table whenever an ARP request is made by the Windows TCP/IP stack and the MAC address is not found in the ARP table. The ARP request is broadcast on the local segment. When the MAC address of the requested IP address is found, that information is added to the ARP table. See also Internet Protocol, media access control, Transmission Control Protocol/Internet Protocol.

Dynamic Host Configuration Protocol (DHCP) A protocol used on a TCP/IP network to send client configuration data, including TCP/IP address, default gateway, subnet mask, and DNS configuration, to clients. See also default gateway, Domain Name Service, subnet mask, Transmission Control Protocol/Internet Protocol.

dynamic packet filtering A type of firewall used to accept or reject packets based on the contents of the packets.

dynamic routing The use of route discovery protocols to talk to other routers and find out what networks they are attached to. Routers that use dynamic routing send out special packets to request updates of the other routers on the network as well as to send their own updates.

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