pany is implementing 802.1X in order to increase network security. In the use of 802.1X  <br /> access control, <br /> which three protocols are allowed through the switch port before authentication  takes place? ()
A、 EAP-over-LAN
B、 EAP MD5
C、 STP
D、 protocols not filtered by an ACL
E、 CDP
F、 TACACS+