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N

named path — JUNOS software syntax that specifies a portion of or the entire network path that should be used as a constraint in signaling an MPLS label-switched path.

NAPT — Network Address Port Translation. A method that translates the addresses and transport identifiers of many private hosts into a few external addresses and transport identifiers to make efficient use of globally registered IP addresses. NAPT extends the level of translation beyond that of basic NAT. See also NAT.

NAT — Network Address Translation. A method of concealing a set of host addresses on a private network behind a pool of public addresses. It can be used as a security measure to protect the host addresses from direct targeting in network attacks.

National Institute of Standards and Technology — See NIST.

NCP — Network Control Protocol. A traffic controller used to establish and configure different network layer protocols for the Point-to-Point Protocol (PPP).

NDP — Neighbor Discovery Protocol. Protocol used by IPv6 nodes on the same link to discover each other’s presence, determine each other’s link-layer addresses, find routers, and maintain reachability information about the paths to active neighbors. NDP is defined in RFC 2461 and is equivalent to the Address Resolution Protocol (ARP) used with IPv4. See also ARP.

neighbor — Adjacent system reachable by traversing a single subnetwork. An immediately adjacent router. Also called a peer.

NET — Network entity title. Network address defined by the ISO network architecture and used in CLNS-based networks.

NetBIOS — Network basic input/output system. An application programming interface (API) used by programs on a LAN. NetBIOS provides a uniform set of commands for requesting the lower-level services required to manage names, conduct sessions, and send datagrams between nodes on a network.

Network Address Port Translation — See NAPT.

Network Address Translation — See NAT.

network basic input/output system — See NetBIOS.

Network Control Protocol — See NCP.

network entity title — See NET.

network interface — Interface, such as an Ethernet or SONET/SDH interface, that primarily provides traffic connectivity. See also PIC and services interface.

network layer reachability information — See NLRI.

network link advertisement — OSPF link-state advertisement flooded throughout a single area by designated routers to describe all routers attached to the network.

network LSA — OSPF link-state advertisement sent by the designated router on a broadcast or NBMA segment. It advertises the subnet associated with the designated router’s segment.

network service access point — See NSAP.

network summary LSA — OSPF link-state advertisement sent by an ABR to advertise internal OSPF routing knowledge across an area boundary. See also ABR.

Network Time Protocol — See NTP.

NIC — Network Information Center. Internet authority responsible for assigning Internet-related numbers, such as IP addresses and autonomous system (AS) numbers. See also IANA.

NIST — National Institute of Standards and Technology. A nonregulatory U.S. federal agency whose mission is to develop and promote measurement, standards, and technology.

NLRI — Network layer reachability information. Information carried in BGP packets and used by MBGP.

nonclient peer — In a BGP route reflection, a BGP peer that is not a member of a cluster. See also client peer.

nonstop routing — See NSR.

notification cell — JUNOS software data structure generated by the Distribution Buffer Manager ASIC that represents the header contents of an IP packet. The Internet Processor ASIC uses the notification cell to perform a forwarding table lookup.

Notification message — BGP message that informs a neighbor about an error condition, and then in some cases terminates the BGP peering session.

not-so-stubby area — See NSSA.

NSAP — Network service access point. Connection to a network that is identified by a network address.

n-selector — Last byte of a nonclient peer address.

NSR — Nonstop routing. A high availability feature that allows a routing platform with redundant Routing Engines to preserve routing information on the backup Routing Engine and switch over from the primary Routing Engine to the backup Routing Engine without alerting peer nodes that a change has occurred. NSR uses the graceful Routing Engine switchover (GRES) infrastructure to preserve interface, kernel, and routing information.

NSSA — Not-so-stubby area. In OSPF, a type of stub area in which external routes can be flooded.

NTP — Network Time Protocol. A protocol used to synchronize computer clock times on a network.

Null Register message — PIM message sent by the first–hop router to the rendezvous point (RP). The message informs the RP that the local source is still actively sending multicast packets into the network. see also RP.

numeric range match conditions — Use of numeric values (protocol and port numbers) in the header of an IP packet to match criteria in a firewall filter.

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