单项选择题 Which of the following is the proper order for powering off and on network components?（）

单项选择题 Mike, a technician, is replacing a wireless router on an existing small office home office (SOHO) network. The SSID, WPA and DHCP information has been correctly added. Which of the following must also be addressed?（）

单项选择题 A technician installed a new wireless access point on an existing small office home office (SOHO) network with a selective security option enabled. All wireless computers connect to the new network except one computer that cannot connect to the wireless network. Which of the following is the cause?（）