libsnmp35 5.8+dfsg-2ubuntu2.6 (amd64 binary) in ubuntu focal

 The Simple Network Management Protocol (SNMP) provides a framework
 for the exchange of management information between agents (servers)
 and clients.
 .
 The Net-SNMP library contains common functions for the construction,
 sending, receiving, decoding, and manipulation of the SNMP requests
 and responses.