SNMP messages are built from an SNMP header and an SNMP protocol data
unit (PDU). The header is quite short and contains a protocol version number.
The PDU contains the request and any data.
There are three versions of SNMP. The original version of SNMP was produced
at the end of the 1980s. SNMPvl turned out to be too simple in many respects,
not having sufficiently powerful requests and using the limited SMIvl to build
its PDUs. After several abortive attempts, the IETF produced SNMPv2 and
documented it in RFC 1901 as an experimental protocol. At the same ...
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