Cisco IPS-4255-K9 Installation Guide - Page 386

Glossary 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 A physical communicating element on the command and control network. For example, an appliance, an IDSM2, or a router. Normalizer engine Configures how the IP and TCP normalizer functions and provides configuration for signature events related to the IP and TCP normalizer. NOS network operating system. Generic term used to refer to distributed file systems. Examples include LAN Manager, NetWare, NFS, and VINES. NotificationApp A component of the IPS. Sends SNMP traps when triggered by alert, status, and error events. NotificationApp uses the public domain SNMP agent. SNMP GETs provide information about the general health of the sensor. NTP Network Timing Protocol. Protocol built on top of TCP that ensures accurate local time-keeping with reference to radio and atomic clocks located on the Internet. This protocol is capable of synchronizing distributed clocks within milliseconds over long time periods. NTP server Network Timing Protocol server. A server that uses NTP. NTP is a protocol built on top of TCP that ensures accurate local time-keeping with reference to radio and atomic clocks located on the Internet. This protocol is capable of synchronizing distributed clocks within milliseconds over long time periods. NVRAM Non-Volatile Read/Write Memory. RAM that retains its contents when a unit is powered off. O OIR online insertion and removal. Feature that permits you to add, replace, or remove cards without interrupting the system power, entering console commands, or causing other software or interfaces to shutdown. OPS Outbreak Prevention Service. P P2P packet PAgP Peer-to-Peer. P2P networks use nodes that can simultaneously function as both client and server for the purpose of file sharing. Logical grouping of information that includes a header containing control information and (usually) user data. Packets most often are used to refer to network layer units of data. The terms datagram, frame, message, and segment also are used to describe logical information groupings at various layers of the OSI reference model and in various technology circles. Port Aggregation Control Protocol. PAgP aids in the automatic creation of EtherChannel links by exchanging PAgP packets between LAN ports. It is a Cisco-proprietary protocol. GL-14 Cisco Intrusion Prevention System Appliance and Module Installation Guide for IPS 7.0 OL-18504-01