D. Network Access Control (NAC).
802.1X, also known as IEEE 802.1X, is a network access control protocol that is used to provide authentication and authorization for devices trying to connect to a network, such as Wi-Fi networks. It ensures that only authorized and authenticated devices are allowed access to the network, making it a key component of Network Access Control (NAC) solutions. NAC helps organizations manage and secure network access by enforcing policies and controlling which devices can connect to the network.
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