Management Information Base. The MIB is one part of the
SNMP system. (The others are SNMP manager and SNMP agent.)
In a managed device, the SNMP agent collects information from the MIB and makes it available to the NMS, or network management system. An agent can, for example, report on the number of broadcast messages that have been sent and received. The variables are known as managed objects. Each managed object type has a MIB, and all managed objects are contained in a database called a MIB.
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MIB II is documented in RFC 1213.