单项选择题 Users are reporting problems connecting to servers in the remote company.com domain. The administrator suspects this to be a DNS problem. Which of the following commands would the administrator run to identify the DNS server of the remote company.com?（）

单项选择题 Which of the following commands is used to display other computers running on the network?（）

单项选择题 Which of the following wireless standards was the FIRST standard to be ratified and is used to support legacy wireless devices?（）