Cisco PIX 525 Dokumentacja Pobierz pdf (Strona 580)

Glossary

GL-12

Cisco Security Appliance Command Line Configuration Guide

OL-6721-01

N2H2

A third-party, policy-oriented filtering application that works with the security appliance to control

user web access. N2H2 can filter HTTP requests based on destination host name, destination IP

address, and username and password. The N2H2 corporation was acquired by Secure Computing in

October, 2003.

NAT

Network Address Translation. Mechanism for reducing the need for globally unique IP addresses.

NAT allows an organization with addresses that are not globally unique to connect to the Internet by

translating those addresses into a globally routable address space.

NEM

Network Extension Mode. Lets VPN hardware clients present a single, routable network to the remote

private network over the VPN tunnel.

NetBIOS

Network Basic Input/Output System. A Microsoft protocol that supports Windows host name

registration, session management, and data transfer. The security appliance supports NetBIOS by

performing NAT of the packets for NBNS UDP port 137 and NBDS UDP port 138.

netmask

See mask.

network

In the context of security appliance configuration, a network is a group of computing devices that

share part of an IP address space and not a single host. A network consists of multiple nodes or hosts.

See also host, Internet, intranet, IP, LAN, and node.

NMS

network management system. System responsible for managing at least part of a network. An NMS is

generally a reasonably powerful and well-equipped computer, such as an engineering workstation.

NMSs communicate with agents to help keep track of network statistics and resources.

node

Devices such as routers and printers that would not normally be called hosts. See also host, network.

nonvolatile storage,

memory

Storage or memory that, unlike RAM, retains its contents without power. Data in a nonvolatile storage

device survives a power-off, power-on cycle or reboot.

NSAPI

Network service access point identifier. One of two components of a GTP tunnel ID, the other

component being the IMSI. See also IMSI.

NSSA

Not-so-stubby-area. An OSPF feature described by RFC 1587. NSSA was first introduced in Cisco

IOS software release 11.2. It is a non-proprietary extension of the existing stub area feature that allows

the injection of external routes in a limited fashion into the stub area.

NTLM

NT Lan Manager. A Microsoft Windows challenge-response authentication method.

NTP

Network time protocol.

Oakley

A key exchange protocol that defines how to acquire authenticated keying material. The basic

mechanism for Oakley is the Diffie-Hellman key exchange algorithm. Oakley is defined in RFC 2412.

object grouping

Simplifies access control by letting you apply access control statements to groups of network objects,

such as protocol, services, hosts, and networks.

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