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300-360 · Question #237
300-360 Question #237: Real Exam Question with Answer & Explanation
The correct answer is B: 802.11r. IEEE 802.11r (Fast BSS Transition) is the protocol that reduces the number of authentication frames exchanged during a roam, enabling the sub-50ms handoffs required by real-time voice and video applications.
Question
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 exchanged between an access point and client are reduced and fast roaming occurs?
Options
- A802.11w
- B802.11r
- C802.11k
- D802.11i
Explanation
IEEE 802.11r (Fast BSS Transition) is the protocol that reduces the number of authentication frames exchanged during a roam, enabling the sub-50ms handoffs required by real-time voice and video applications.
Common mistakes.
- A. 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.
- C. 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.
- D. 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.
Concept tested. IEEE 802.11r Fast BSS Transition for real-time roaming
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