CompTIA Network+ N10-006 Q438

In a network that requires multilayer switches to use authentication via RADIUS/TACACS+, which of the following access control models will the switches need to utilize?

A. 802.1q
B. 802.3af
C. PKI
D. 802.1x

Correct Answer: D

Explanation/Reference:
http://www.cisco.com/c/en/us/td/docs/ios/12_4t/12_4t11/ht_8021x.html#wp1258507