Namp
North American Numbering Plan

NAP
Network Access Point - A location where ISP's exchange each other's traffic.

Narp
Non-Broadcast Multiple Access Address Resolution Protocol - RFC1735

NAS
Network Attached Storage

NAT
Network Address Translation - RFC 1631

NAT-PT
Network Address Translation- Protocol Translation

NAU
Network Addressable Units - IBM ¨ SNA term for an addressable entity. ex: PUs, LUs, and SSCPs.

NAUN
Nearest Active Upstream Neighbor - MAC

NBAR
Network Based Application Recognition - Cisco

NCB
Network Control Block

NETBEUI
Netbios Enhanced User Interface

NETBIOS
Network Adapter Basic Input Output System

NFAS
No Frame Alignment Sequence - Telephony

NGI
Next Generation Internet

NGN
New Generation Network

NHDR
Network Layer Header

NHRP
Next Hop Resolution Protocol - X.25

NPDU
Network Protocol Data Unit - OSI

NPI
Numbering Plan Indicator

NPR
Notice of Proposed Rule-Making

N(R)
Receive Sequence - ACK - number / Link Layer

NRM
Normal Response Mode

NRZ
Non-return to Zero

NRZI
Non-return to Zero Inverted

N(S)
Send Sequence Number - Link Layer

NSAP
Network Service Access Point - OSI

NSDU
Network Service Data Unit - OSI

NSEC
Nanoseconds - 10 ** -9

NSP
Network Services Protocol

NT1, 2
Network Terminator, types 1 and 2 - ISDN

NUA
Network User Address

NUI
Network User Identification - X.25 network