The snmpd daemon acts as the central SNMP data repository for a given host. In it's most typical usage, it listens to port 161 (and possibly 10161) and:
- waits for requests to come in and responds to them
- issues notifications (TRAPs and INFORMs)
- is capable of performing some Self Monitoring
How it works
Internally, the agent's architecture is composed of a primary processing engine and a bunch of handlers that are responsible for returning and processing data from sections of the MIB tree. See the Agent Architecture document for more details about the internal guts of the agent.