Question: what do snmpv1 and snmpv2 have in common?
Answer: About SNMPv1 and SNMPv2 SNMPv2 includes improvements in performance and security. It adds new protocol operations such as GetBulk and Inform, which allow the management system to request larger blocks of data from the agent. Both SNMPv1 and SNMPv2 use common strings that are sent in clear text to authenticate clients.