单项选择题
A.Switch3
B.Switch4
C.Switch2
D.Switch1
单项选择题 What speeds must be disabled in a mixed 802.11b/g WLAN to allow only 802.11g clients to connect?（）
单项选择题 Which port state is introduced by Rapid-PVST?（）
单项选择题 The following configuration line was added to router R1 Access-list 101 permit ip 10.25.30.00.0.0.255 any What is the effect of this access list configuration？（）
