单项选择题
Which of the following uses pair authentication to provide a wireless connection between twodevices?（）
A. 802.11n B. Bluetooth C. Infrared D. Cellular
单项选择题 Which of the following commands can be used to verify the gateway IP address on a localcomputer?（）
单项选择题 Which of the following occurs during POST?（）
单项选择题 Which of the following is the MAXIMUM cable length for 802.3 Ethernet?（）
