The Free On-line Dictionary of Computing (30 December 2018):

Management Information Base
MIB

    (MIB) A database of managed objects acessed by
   network management protocols.  An SNMP MIB is a set of
   parameters which an SNMP management station can query or
   set in the SNMP agent of a network device (e.g. router).

   SNMP has two standard MIBs.  The first, MIB I, was
   established in RFC 1156, was defined to manage
   TCP/IP-based internets.  MIB II, defined in RFC 1213, is
   an update.

   Standard minimal MIBs have been defined, and many hardware
   (and certain software, e.g. DBMS) providers have developed
   private MIBs in ASN.1 format allowing them to be compiled
   for use in a Network Management System.  In theory, any
   SNMP manager can talk to any SNMP agent with a properly
   defined MIB.

   See also client-server model.

   (2004-07-22)