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simple network management protocol : ウィキペディア英語版
simple network management protocol

Simple Network Management Protocol (SNMP) is an "Internet-standard protocol for managing devices on IP networks". Devices that typically support SNMP include routers, switches, servers, workstations, printers, modem racks and more. SNMP is widely used in network management systems to monitor network-attached devices for conditions that warrant administrative attention. SNMP is a component of the Internet Protocol Suite as defined by the Internet Engineering Task Force (IETF). It consists of a set of standards for network management, including an application layer protocol, a database schema, and a set of data objects.〔RFC 3411 — An Architecture for Describing Simple Network Management Protocol (SNMP) Management Frameworks〕
SNMP exposes management data in the form of variables on the managed systems, which describe the system configuration. These variables can then be queried (and sometimes set) by managing applications.
==Overview and basic concepts==

In typical uses of SNMP one or more administrative computers, called ''managers'', have the task of monitoring or managing a group of hosts or devices on a computer network. Each managed system executes, at all times, a software component called an ''agent'' which reports information via SNMP to the manager.
SNMP agents expose management data on the managed systems as variables. The protocol also permits active management tasks, such as modifying and applying a new configuration through remote modification of these variables. The variables accessible via SNMP are organized in hierarchies. These hierarchies, and other metadata (such as type and description of the variable), are described by Management Information Bases (MIBs).
An SNMP-managed network consists of three key components:
*Managed device
*Agent — software which runs on managed devices
*Network management station (NMS) — software which runs on the manager
A ''managed device'' is a network node that implements an SNMP interface that allows unidirectional (read-only) or bidirectional (read and write) access to node-specific information. Managed devices exchange node-specific information with the NMSs. Sometimes called network elements, the managed devices can be any type of device, including, but not limited to, routers, access servers, switches, cable modems, bridges, hubs, IP telephones, IP video cameras, computer hosts, and printers.
An ''agent'' is a network-management software module that resides on a managed device. An agent has local knowledge of management information and translates that information to or from an SNMP-specific form.
A ''network management station'' (NMS) executes applications that monitor and control managed devices. NMSs provide the bulk of the processing and memory resources required for network management. One or more NMSs may exist on any managed network.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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