B.2. Agents and Managers
The managed devices (routers, switches, web hosts, desktop computers, network printers, and so on) each run a server process (daemon) called an SNMP agent. This agent listens on a particular UDP port (usually, but not always, port 161) for read (GET) and write (SET) commands. It's the agent's responsibility to fetch the requested data and return it. This agent, as well as other monitoring software on the device, may also send spontaneous notifications called traps or informs to one or more configured target systems.
Management applications (managers) poll the agents for information. They may keep historical information, generate reports, or create graphical maps of the devices in your network. Some management applications ...
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