This read-create value sets which SNMP protocol version and security level a configured trap destination uses to receive notifications: snmpv1(1), the default, snmpv2(2), or one of three SNMPv3 variants distinguished by authentication/privacy level; it cannot be modified while the associated trapDestStatus is active(1). An admin sets this to match the SNMP capabilities of the actual receiving management station, using an SNMPv3 variant with authentication and/or privacy for a more secure trap delivery than plaintext SNMPv1/v2. For example, setting hpnicfTrapDestVersion to snmpv3andpriv(5) for a trap destination ensures notifications sent to that NMS are both authenticated and encrypted rather than sent as plaintext SNMPv1 traps.