NBNS Like DNS, NetBIOS Name Service (NBSN) is used in centralised
name resolution. See also WINS and DNS.
Netmask With IPv4 in connection with the IP address, the netmask, also net-
work mask and subnet mask, defines the network by dividing the IP
address into network and device parts and thus determining which
addresses need to be routed. Example of a netmask:
255.255.255.0. With IPv6 one refers to prefix length.
Network address A network address is the address of the network as a whole. The
network mask and prefix length divide the IP address into the net-
work address and host address (device address). Example of a net-
work address: 192.168.0.250/24
Network route The network route refers to the route to a particular network.
Network termination Network termination (NT) refers to a connection or operating type. A
terminal is given access to a communication network at the NT inter-
face (connection socket). The connector is called a TAE with an
analogue connection, an NTBA with the basic ISDN connection, and
NTPMGF with the ISDN Primary Rate Interface. In the NT operation,
the gateway is connected to the PABX's external S0 and is an ex-
ternal exchange connection for it. See also TE.
NT See Network termination.
NTP The Network Time Protocol (NTP) is used to synchronise the time of
day.
OAM OAM is a service for monitoring ATM connections.
OSI model The OSI model divides the flow of communication between the
physical medium and the user level into layers. The requirements at
each layer are met by relevant protocols.
OSPF OSPF is a dynamic routing protocol which is usually used in larger
network installations as an alternative to RIP.
PAP The Password Authentication Protocol (PAP) is an authentication
method for connections via PPP. Unlike with CHAP, the username
and password are not sent encrypted.
PAT Port and Address Translation (NAT) is used to replace the source
and destination IP addresses and source and destination ports of a
data packet with others. This enables different networks to be con-
nected to one another. See also NAT.
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Glossary
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