单项选择题 A user reports that when the phone rings in their house the wireless on their laptops becomes disconnected. Which of the following BEST describes the issue?（）

单项选择题 A computer configured to use DHCP cannot locate a DHCP server. Automatic Private IP Address(APIPA) will assign which of the following addresse？（）

单项选择题 Which of the following is a valid IP address in the public addressing scheme?（）