SNMPv2c (RFC 1901-1908)
Community-based SNMPv2, the most widely deployed version of SNMP in production today. Adds the GetBulkRequest PDU for efficient table retrieval and the InformRequest PDU for acknowledged notifications, while retaining the community-string security model of SNMPv1. RFC 3416 later republished the v2 protocol operations as part of the SNMPv3 framework.