单项选择题
Which of the following has the HIGHEST data rate speed?（）
A.T1 B.ADSL C.SDSL D.OC-3
单项选择题 Which of the following should be used to test an internal NIC without having to connect it to thenetwork?（）
单项选择题 A stateless firewall requires a technician to:（）
单项选择题 How many bits are in an IPv6 address?（）
