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