A wireless engineer is designing a wireless network to support real-time applications over wireless. Which IEEE protocol must the engineer enable on the WLC so that the number of packets that are exch

802.11w defines Management Frame Protection (MFP), which cryptographically secures management frames against spoofing attacks but has no effect on roaming speed or packet count.

802.11r, known as Fast BSS Transition (FT), pre-caches Pairwise Master Key (PMK) security credentials at the WLC or neighboring APs before a client roams, reducing the full 802.1X/EAP re-authentication sequence to a two-frame exchange during the actual transition. This dramatically cuts roaming latency and the number of packets exchanged, satisfying the strict delay budgets of real-time applications like VoIP and video conferencing.

802.11k provides radio resource management and neighbor reports that help a client select the best target AP, but it does not reduce the authentication handshake frames during the roam itself.

802.11i defines the Robust Security Network (RSN) framework including WPA2 authentication and encryption standards, but it does not optimize or accelerate the BSS transition process.