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?（）
A.Ping
B.Arp
C.Dig
D.telnet
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B. Network-based firewall
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Which of the following commands would allow a computer to acquire an IP address?（）
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