What switch security configuration requires AAA to be configured on the switch?

A.
VACL

B.
802.1x

C.
Private VLAN

D.
port security

Explanation:
802.1x requires AAA to be configured on the switch. 802.1x uses AAA authentication to control access to the
port.
The overall steps required to configure a switch for 802.1x are:
Enable AAA on the switch.
Define the external RADIUS server(s) and the key to be used for encryption.
Define the authentication method.
Enable 802.1x on the switch.
Configure each switch port that will use 802.1x.
Optionally allow multiple hosts on the switch port.
Objective:
Infrastructure Security
Sub-Objective:
Describe device security using AAA with TACACS+ and RADIUS

Consolidated Platform Configuration Guide, Cisco IOS XE Release 3E (Cisco 5700 Series WLC) – Configuring
IEEE 802.1x Port-Based Authentication (PDF)