单项选择题
Which of the following LAN technologies is defined as fast Ethernet?（）
A.10Base-T B.100Base-T C.100Base-FX D.1000Base-T
单项选择题 Which of the following security threats involves making phone calls?（）
单项选择题 When setting up a wireless network to cover a large area, which of the following needs to beconsidered FIRST?（）
单项选择题 On a network switch, which of the following is the default native VLAN?（）
