 awaiting test. Under mgmt there In March 1988 SGMP was developed by the IAB into the Simple is presently one standard mib, referred to as the Internet MIB. This Network Management Protocol (SNMP), the intention being that is MIB I which has MIB II as a superset. the protocol would be used as an interim, until full OSI based Each node on the tree has a number and a symbolic name. Either protocols became available. A system was envisaged which would numeric or object description forms may to used for representing an be able to carry OSI messages over TCP/IP and this was called MIB object. For example the ifPhysAddress variable is stored as an The Simple Network Management Protocol 16/21 object string, described by iso org dod internet mgmt mib interfaces Table 16.4 MIB Object Groups and functions within Table ifEntry ifPhysAddress or by 1.3.6.1.2.1.2.2.1.6. SNMP. The first five Object Groups are mandatory. The last Object Group is from MIB II Individual object entries can be grouped into tables, SNMP defin- ing five kinds of tables, as shown in Table 16.5. Group name Description Table 16.5 MIB tables within SNMP system System wide information about the managed node itself interfaces Table type Type of values stored Information about parts and interfaces on the IF Table Status of the interfaces on the agent The (address translation) table which gives AT Table Address translation values translation from network address to IP address IP Address Table IP address of all interfaces on the agent Information covering all the IP counters and IP Routing Table IP destination addresses tables having routing and addressing data TCP Con Table Status of TCP connections Information covering all the Internet Control Message Protocol Counters Information covering all the Transmission Control protocol counters and TCP The third main element of SNMP is provided in RFC 1067, connections to the SNMP agent upgraded to RFC 1157, which covers SNMP itself. Whereas the SMI and MIB documents define the set of managed objects, the Information