单项选择题
Which of the following tools can be used to identify the location of a network outage?（）
A.traceroute
B.netstat
C.nslookup
D.ping
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单项选择题
Several users are sending emails to CompTIA.org. but they are not being received. Which of thefollowing commands could be used to verify that the company is able to connect to the mailservice at CompTIA.org?（）
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单项选择题
Which of the following devices can be installed on individual computers throughout the network?（）
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