单项选择题
A technician needs to troubleshoot connectivity between two devices located on the same network. Which of the following BEST describes the type of protocol being used?（）
A.IGP B. EIGRP C. EGP D. BGP
单项选择题 Which of the following methods can move files in clear text and can be easily intercepted?（）
单项选择题 Which of the following tools would a technician use to check functionality of a physical networkconnection?（）
单项选择题 Which of the following is an invalid subnet mask?（）
