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?（）
A. dig company.com ns
B. ipconfig/all
C. ifconfig-a
D. dig company.com mx
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Which of the following commands is used to display other computers running on the network?（）
A. hostname
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C. net view
D. nslookup -
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?（）
A.802.11a
B.802.11g
C.802.11b
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单项选择题
Which of the following is used to create multiple networks from one large network?（）
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