Watchguard Firebox X1000, Reference Manual

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Reference Guide 117
default
A predefined setting that is built into a program and is used when
an alternative setting is not specified.
default packet handling
The practice of automatically and temporarily blocking hosts that
originate probes and attacks against a network.
denial of service attack (DoS)
A way of monopolizing system resources so that other users are
ignored. For example, someone could Finger an unsecured host
continuously so that the system is incapable of running or
executing other services.
DES (Data Encryption Standard)
A block-oriented cipher that encrypts blocks of 64 bits. The
encryption is controlled by a key of 56 bits. See also
Triple DES
.
descending
A method of ordering a group of items from highest to lowest,
such as from Z to A.
device
Networking equipment such as a hub, switch, bridge, or router.
DHCP (Dynamic Host Configuration Protocol)
A means of dynamically allocating IP addresses to devices on a
network.
DHCP server
A device that automatically assigns IP addresses to network
computers from a defined pool of numbers.
dialog box
A box that displays additional options when a command is chosen
from a menu.
dial-up connection
A connection between a remote computer and a server using
software, a modem, and a telephone.
dictionary attack
An attack that attempts to reveal a password by trying logical
combinations of words.