Figure 17-21 Snmp Management Model - ZyXEL Communications Internet Security Gateway ZyWALL 2 Series User Manual

ZyWALL 2 Series User's Guide

Figure 17-21 SNMP Management Model

An SNMP managed network consists of two main types of component: agents and a manager.
An agent is a management software module that resides in a managed device (the ZyWALL). An agent
translates the local management information from the managed device into a form compatible with SNMP.
The manager is the console through which network administrators perform network management functions. It
executes applications that control and monitor managed devices.
The managed devices contain object variables/managed objects that define each piece of information to be
collected about a device. Examples of variables include such as number of packets received, node port status
etc. A Management Information Base (MIB) is a collection of managed objects. SNMP allows a manager and
agents to communicate for the purpose of accessing these objects.
SNMP itself is a simple request/response protocol based on the manager/agent model. The manager issues a
request and the agent returns responses using the following protocol operations:
Remote Management Screens 17-23