单项选择题
A. TACACS+ is the only supported authentication server type.
B. If a host initiates the authentication process and does not receive a response， it assumes it is not authorized.
C. RADIUS is the only supported authentication server type.
D. Before transmitting data， an 802.1x host must determine the authorization state of the switch.
E. Hosts are required to havea 802.1x authentication client or utilize PPPoE.
F. None of the other alternatives apply.
单项选择题 Refer to the exhibit. How will interface FastEthernnet0/1 respond when an 802.1x-enabled client connects to the port？ （）
单项选择题 An attacker is launching a DoS attack on the Company network using a hacking tool designed to exhaust the IP address space available from the DHCP servers for a period of time. Which procedure would best defend against this type of attack？ （）
单项选择题 The Company is concerned about Layer 2 security threats. Which statement is true about these threats？ （）