Which IEEE protocol must the engineer enables on the WLC so that the number of packets that are exchanged between an access point and client are reduced and fast roaming occurs?

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A wireless engineer is designing a wireless network to support real-time applications over wireless.

Which IEEE protocol must the engineer enables on the WLC so that the number of packets that are exchanged between an access point and client are reduced and fast roaming occurs?
A . 802.11w
B . 802.11r
C . 802.11i
D . 802.11k

Answer: B