CCNA Cisco Certified Network Associate Study Guide - FTP Server

Glossary 693
NHS Next Hop Server: Defined by the NHRP protocol, this server maintains
the next-hop resolution cache tables, listing IP-to-ATM address maps
of related nodes and nodes that can be reached through routers served by
the NHS.
NIC network interface card: An electronic circuit board placed in a computer.
The NIC provides network communication to a LAN.
NLSP NetWare Link Services Protocol: Novell’s link-state routing protocol,
based on the IS-IS model.
NMP Network Management Processor: A Catalyst 5000 switch processor
module used to control and monitor the switch.
node address Used to identify a specific device in an internetwork. Can be
a hardware address, which is burned into the network interface card or a logical
network address, which an administrator or server assigns to the node.
nondesignated port The Spanning-Tree Protocol tells a port on a layer-2
switch to stop transmitting and creating a network loop. Only designated
ports can send frames.
non-stub area In OSPF, a resource-consuming area carrying a default
route, intra-area routes, interarea routes, static routes, and external routes.
Non-stub areas are the only areas that can have virtual links configured
across them and exclusively contain an anonymous system boundary router
(ASBR). Compare with: stub area. See also: ASBR and OSPF.
NRZ Nonreturn to Zero: One of several encoding schemes for transmitting
digital data. NRZ signals sustain constant levels of voltage with no signal
shifting (no return to zero-voltage level) during a bit interval. If there is a
series of bits with the same value (1 or 0), there will be no state change. The
signal is not self-clocking. See also: NRZI.
NRZI Nonreturn to Zero Inverted: One of several encoding schemes for
transmitting digital data. A transition in voltage level (either from high to
low or vice-versa) at the beginning of a bit interval is interpreted as a value
of 1; the absence of a transition is interpreted as a 0. Thus, the voltage
assigned to each value is continually inverted. NRZI signals are not selfclocking.
See also: NRZ.