Which mechanism is used for automatic rekeying in 802.11i?

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Multiple Choice

Which mechanism is used for automatic rekeying in 802.11i?

Explanation:
Automatic rekeying in 802.11i refreshes the group key used for multicast and broadcast traffic. This is done through Group Key Rekeying, where the AP periodically distributes a new Group Temporal Key (GTK) to all stations using the Group Key Handshake. This keeps the shared group encryption key fresh without requiring user intervention, while individual unicast keys (PTK) are managed through the 4‑way handshake for each station. The encryption method itself—AES-CCMP—provides the frame protection, but it is not the mechanism that performs the key refresh.

Automatic rekeying in 802.11i refreshes the group key used for multicast and broadcast traffic. This is done through Group Key Rekeying, where the AP periodically distributes a new Group Temporal Key (GTK) to all stations using the Group Key Handshake. This keeps the shared group encryption key fresh without requiring user intervention, while individual unicast keys (PTK) are managed through the 4‑way handshake for each station. The encryption method itself—AES-CCMP—provides the frame protection, but it is not the mechanism that performs the key refresh.

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