Watchguard Firebox X1000 Reference Manual page 122

CHAPTER 9: Glossary
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authorization
To convey official access or legal power to a person or entity.
backbone
A term often used to describe the main network connections
composing the Internet.
backdoor
A cipher design fault, planned or accidental, that allows the
apparent strength of the design to be easily avoided by those who
know the trick. When the design background of a cipher is kept
secret, a back door is often suspected.
bandwidth
The rate at which a network can transfer data.
Bandwidth Meter
A monitoring tool that provides a real-time graphical display of
network activities across a Firebox. Formerly known as the
Mazameter.
bastion host
A computer placed outside a firewall to provide public services
(such as WWW and FTP) to other Internet sites. The term is
sometimes generalized to refer to any host critical to the defense
of a local network. In WatchGuard documentation, also called the
optional network.
bitmask
A pattern of bits for an IP address that determines how much of
the IP address identifies the host and how much identifies the
network.
block cypher
A symmetric cipher operating on blocks of plain text and cipher
text, usually 64 bits.
blocked port
A security measure in which a specific port associated with a
network service is explicitly disabled, blocking users outside the
firewall from gaining access to that service port. A blocked port
takes precedence over any service settings that are generally
enabled.
WatchGuard Firebox System