Simple Network Management Protocol; Snmp Overview - Interlogix NS4702-24P-4S-4X User Manual

4.3 Simple Network Management Protocol

4.3.1 SNMP Overview

The Simple Network Management Protocol (SNMP) is an application layer protocol that facilitates the exchange of management
information between network devices. It is part of the Transmission Control Protocol/Internet Protocol (TCP/IP) protocol suite. SNMP
enables network administrators to manage network performance, find and solve network problems, and plan for network growth.
An SNMP-managed network consists of three key components: Network management stations (NMSs), SNMP agents,
Management information base (MIB) and network-management protocol：
Network management stations (NMSs)：Sometimes called consoles, these devices execute management applications that
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monitor and control network elements. Physically, NMSs are usually engineering workstation-caliber computers with fast
CPUs, megapixel color displays, substantial memory, and abundant disk space. At least one NMS must be present in each
managed environment.
Agents：Agents are software modules that reside in network elements. They collect and store management information such
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as the number of error packets received by a network element.
Management information base (MIB)：A MIB is a collection of managed objects residing in a virtual information store.
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Collections of related managed objects are defined in specific MIB modules.
Network-management protocol：A management protocol is used to convey management information between agents and
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NMSs. SNMP is the Internet community's de facto standard management protocol.
SNMP Operations
SNMP itself is a simple request/response protocol. NMSs can send multiple requests without receiving a response.
Get -- Allows the NMS to retrieve an object instance from the agent.
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Set -- Allows the NMS to set values for object instances within an agent.
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Trap -- Used by the agent to asynchronously inform the NMS of some event. The SNMPv2 trap message is designed to
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replace the SNMPv1 trap message.
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