单项选择题 Which of the following ports can Mike, a technician, use with an IP address to test FTPconnectivity?（）

单项选择题 Mike, a technician, is installing a wireless router for a client. Which of the following is MOST important when installing a wireless router?（）

单项选择题 Computers on the network are frequently infected with viruses, malware, worms and Trojans.Which of the following should Mike, a technician, update automatically to prevent future problems?（）