Final answer:
The IETF version of HSRP is VRRP (Virtual Router Redundancy Protocol), an open standard protocol enabling router redundancy and dynamic failover across various vendors' hardware.
Step-by-step explanation:
The technology that is an IETF (Internet Engineering Task Force) version of HSRP (Hot Standby Router Protocol) is VRRP (Virtual Router Redundancy Protocol). Unlike HSRP, which is a Cisco proprietary protocol, VRRP is an open standard protocol defined in RFC 5798. This allows it to be implemented on networking devices from different vendors. While both HSRP and VRRP provide router redundancy to achieve higher network availability, VRRP is considered the standardized approach across different hardware platforms, providing a mechanism for dynamic failover in a group of routers without any single point of failure.