User guide

182 WatchGuard Firebox X Edge
subnetting is in effect. Some systems require the netmask to be an even number
of bits.
network adaptor, network interface card
A device that sends and receives data between the computer and the network
cabling. It may work either internally, such as a PCI, or externally, such as a SCSI
adaptor which connects to a computer’s SCSI port.
network number
The portion of an IP address that is common to all hosts on a single network
and is normally defined by the set portion of the corresponding netmask.
network range
The portion of an IP address that is allocated to individual hosts on a single
network and is normally defined by the cleared portion of the corresponding
netmask.
NFS (Network File System)
A popular TCP/IP service for providing shared file systems over a network.
NIST
See
National Institute for Standards and Technology .
node
A computer or CPU on a network.
non-seed router
A router that waits to receive routing information (the routing maintenance
table) from other routers on the network before it begins routing packets.
NTP (Network Time Protocol)
An Internet service used to synchronize clocks between Internet hosts. Properly
configured, NTP can usually keep the clocks of participating hosts within a few
milliseconds of each other.
Oakley
The Oakley Session Key Exchange provides a hybrid Diffie-Hellman session key
exchange for use within the ISA/KMP framework. Oakley provides the important
property of Perfect Forward Secrecy.
octet
A byte. Used instead of “byte” in most IP documents because historically many
hosts did not use 8-bit bytes.
one-time pad
A large, non-repeating set of truly random key letters used for encryption,
considered the only perfect encryption scheme.
one-way hash function
A function that produces a message digest that cannot be reversed to produce
the original.