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.
References (CompTIA Network+ N10-009):
Domain: Network Security - NAC, 802.1X authentication, identity-based access.