Which protocol was superseded by GCMP for authentication in WPA3?

The correct answer is CCMP (Cipher Block Chaining Message Authentication Code Protocol), which was the previous authentication protocol used in WPA2. In WPA3, it has been superseded by GCMP (Galois Counter Mode Protocol), which offers enhanced security features. GCMP incorporates both encryption and authentication, streamlining the process and providing a robust level of protection against various forms of attacks, making it a significant improvement for wireless security.

In contrast, SAE (Simultaneous Authentication of Equals) is a password-based authentication method used in WPA3 that replaces the Pre-Shared Key (PSK) method from WPA2, but it specifically relates to how devices establish authentication rather than replacing CCMP directly. Protection frames, while important for securing data against replay attacks, do not serve as direct substitutes for the cryptographic protocols involved in authentication. GCMP, although related as the new protocol for authenticating and encrypting data, is not the answer to this specific question regarding what was replaced. Hence, CCMP is identified as the correct response for what was superseded in WPA3 for this context.