A. 802.11w (now part of 802.11-2012) introduces protection for management frames, especially disassociation and deauthentication frames, helping prevent spoofing-based DoS attacks. However, it cannot prevent all types of Layer 2 DoS (e.g., RF jamming).
D. Specifically, 802.11w protects disassociation and deauthentication frames by signing them with cryptographic keys.
Incorrect:
B. The MAC header and PHY preamble are not encrypted under any standard.
C. Authentication and association frames are not protected by 802.11w; only certain management frames are.
[References:, , CWSP-208 Study Guide, Chapter 6 (802.11w Management Frame Protection), , IEEE 802.11w and 802.11-2012 Standards, ]
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