Definitions of the following terms:

Managing entity:

Managing entity is control the collection, processing, analysis, display of network management information, and is used by the network manager to control the devices in the network.

Managed device:

Managed device is a piece of network equipment that is under the control of the managing entity.

Management agent:

Management agent is a software process running on a managed device that communicated with the managing entity and takes action on the managed device under the control of the managing entity.

MIB:

Management information base (MIB) is a pieces of information associated with all of the managed objects in a device.

Network management protocol:

Network management protocol runs between the managing entity of the management agents on the managed devices, allowing the agents to alert the managing entity to potential problems, and allowing the managing entity to send commands to the management agents.