SNMP stands for Simple Network Management Protocol, SNMP operate in the application layer of the OSI Model. The SNMP agent receives requests on UDP port 161. The manager may send requests from any available source port to port 161 in the agent. The agent response will be sent back to the source port on the manager.
The Simple Network Management Protocol (SNMP) is the standard operations and maintenance protocol for the Internet. SNMP-based management not only produces management solutions for systems, applications, complex devices, and environmental control systems, but also provides the Internet management solutions supporting Web services.
SNMP support includes routers, switches, Servers, workstations, printers, modem tracks, and more. SNMPv3, the most recent standard approved by the Internet Engineering Task Force (IETF). It is used mostly in network management system to monitor network-attached devices for conditions that warrant administrative attention.