Which protocol defines port-based authentication to restrict unauthorized hosts from connecting to the LAN through publicly accessible switch ports?

Which protocol defines port-based authentication to restrict unauthorized hosts from connecting to the LAN through publicly accessible switch ports?

• RADIUS
• TACACS+
• 802.1x
• SSH

Explanation: 802.1x is an IEEE standard that defines port-based access control. By authenticating each client that attempts to connect to the LAN, 802.1x provides protection from unauthorized clients.

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