802.1X is a port-based Network Access Control (NAC) method that enforces authentication before allowing access to the network. It uses a RADIUS server for identity verification and policy enforcement, ensuring only authorized users/devices gain access.
A. Standard ACL filters traffic by IP, not identity.
B. MAC filtering controls devices by hardware address but can be spoofed.
D. SSO (Single Sign-On) provides user convenience across services, not network-level access control.
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