(a) Why is 802.1X called Port-Based Access Control? (b) Where is the heavy authentication work done? (c)...

Question:

(a) Why is 802.1X called Port-Based Access Control?
(b) Where is the heavy authentication work done?
(c) What are the three benefits of using a central authentication server?
(d) Which device is the verifier? Explain. (Tricky question)
(e) Which device is called the authenticator?