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Network User Identification (NUI): An identification, similar to a password, that may be required over X.25 lines, particularly dial-up lines.
G
Node: A discrete termination point in a network at which
data can flow onto and/or off the network from/to user
devices and systems.
Glossary
1
Nonbroadcast network: Supports more than two attached
routers but has no broadcast capability. Frame relay and X.25
are examples of nonbroadcast networks. There are two general types of nonbroadcast networks, nonbroadcast multiaccess (NBMA) and point-to-multipoint. The differences
between the two depend more on the configuration of routers
than on the physical network.
Nonvolatile Storage: Any storage medium or circuitry that
does not lose its contents when power is turned off or lost.
NRZ/NRZI (Non-Return to Zero/Non-Return to Zero
Inverted): Coding used to represent the signaling on a line.
Null: A control character without meaning that is used to
pad transmissions to comply with format and timing
requirements.
O
OSI (Open Systems Interconnection): A seven-layer logical structure for network operations.
OSPF (Open Shortest Path First): A routing scheme that
operates over IP protocol. OSPF is a link state metric protocol that makes routing decisions based on link capacity, delay
and throughput requirements, the number of data units presently in queue for transmission over a particular link, the
number of hops required to reach a destination, and the ability to reach gateways and routers along the route. To take network dynamics into account, OSPF includes a weighting
factor for each route. OSPF is considered a more robust protocol than RIP, which makes routing decisions based only on
the number of hops to a destination.
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