单项选择题
Which of the following tools would a technician use to check functionality of a physical networkconnection?（）
A. Butt set B. Cable tester C. Protocol analyzer D. Voltage event recorder
单项选择题 Which of the following is an invalid subnet mask?（）
单项选择题 Which of the following protocols is the LEAST secure and should be avoided on a wireless network?（）
单项选择题 Which of the following should be configured to provide priority to voice traffic?（）
