Watchguard Firebox X1000 Reference Manual page 144

CHAPTER 9: Glossary
132
modem
A communications device that sends computer transmissions
over a standard telephone line.
motherboard
The main printed circuit board in a computer, which contains
sockets that accept additional boards (daughterboards).
MSDUN
Microsoft Dial-Up Networking is an executable program required
for remote user VPN.
multiple network configuration
A configuration used in situations in which a Firebox is placed
with separate logical networks on its interface.
National Institute for Standards and Technology
A division of the U.S. Department of Commerce that publishes
open interoperability standards called Federal Information
Processing Standards (FIPSs).
network address
The network portion of an IP address. For a class A network, the
network address is the first byte of the IP address. For a class B
network, the network address is the first two bytes of the IP
address. For a class C network, the network address is the first
three bytes of the IP address. In each case, the remainder is the
host address. In the Internet, assigned network addresses are
globally unique.
network address translation (NAT)
A method of hiding or masquerading network addresses from
hosts on another network, protecting the confidentiality and
architecture of the network.
netmask
An inverse mask of the significant bits of a network address. On a
local net, the range of addresses one can expect to be found
directly connected to the network. Because netmasks generally
occur with a Class C license address space of 8 bits, the netmask is
255.255.255.0. It can be a smaller number of bits if subnetting is in
effect. Some systems require the netmask to be an even number of
bits.
WatchGuard Firebox System