Managing entity: 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: a piece of network equipment that is under the control of
the managing entity.

Management agent: 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: pieces of information associated with all of the managed objects in a
device.

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.