NonStop S-Series Planning and Configuration Guide (G06.26+)

Glossary
HP NonStop S-Series Planning and Configuration Guide—523303-017
Glossary-69
network control process
network control process. A process pair, named $NCP, that runs in each system of an
Expand network. $NCP establishes and terminates system-to-system connections,
maintains network-related system tables (including the network routing table, NRT),
calculates the most efficient way to transmit data to other systems in the network,
monitors and logs changes in the status of the network and its systems, informs
$NCPs at neighbor systems of changes in line or Expand line-handler process status,
and aborts pending requests when all paths go down. See also network routing table
(NRT).
Network Information Service (NIS). A distributed name service (formerly known as Yellow
Pages) developed by Sun Microsystems. See also Domain Name System (DNS)
.
network routing table (NRT). A table that resides in each processor in each system in a
network. The NRT associates each destination system with the logical device (LDEV)
number of the best-path route Expand line-handler process to use to send messages
to that system. See also network control process
.
network topology. The physical layout of components that define a system, a local area
network (LAN), or a wide area network (WAN).
neutral. (1) The conductor used as the primary return for current during normal operation of
electrical equipment. (2) The junction of the legs in a wye circuit. See also wye
.
(3) Generally at ground potential.
NIS. See Network Information Service (NIS).
nld utility. A utility that collects, links, and modifies code and data blocks from one or more
object files to produce a target TNS/R native object file. See also
ld utility.
NNA. See node-numbering agent (NNA).
NNA PIC. See node-numbering agent (NNA) plug-in card (PIC).
node. (1) A uniquely identified computer system connected to one or more other computer
systems in a network. See also Expand node
and ServerNet node. (2) An endpoint in a
ServerNet fabric, such as a processor or ServerNet addressable controller (SAC).
node number. A number used to identify a member system in a network. The node number
is usually unique for each system in the network. See also node
and ServerNet node
number.
node-numbering agent (NNA). A field-programmable gate array (FPGA) in a single-mode
fiber-optic (SMF) plug-in card (PIC) that translates the node number of each ServerNet
packet entering or exiting the external ServerNet fabrics.
node-numbering agent (NNA) plug-in card (PIC). A plug-in card (PIC) for the modular
ServerNet expansion board (MSEB) that supports the node-numbering agent (NNA)
interface.