单项选择题
A. IEEE 802.3
B. IEEE 802.5
C. IEEE 802.11h
D. IEEE 802.11c
E. IEEE 802.11
单项选择题 Which of the following data network would you implement if you wanted a wireless network that had a relatively high data rate, but was limited to very short distances?（）
多项选择题 When you compare the differences between half-duplex and full-duplex Ethernet,which of the following characteristics are exclusive to half-duplex?（）
多项选择题 What are the differences between full-duplex Ethernet and half-duplex Ethernet?（）