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單項(xiàng)選擇題

Which of the following should be avoided when installing a laser printer?（）

A. Surge protector
B. UPS
C. RJ-45 connector
D. Toner

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單項(xiàng)選擇題

Which of the following is the subnet mask for a Class C IP address?（）

A.10.0.0.1
B.192.168.1.1
C.255.255.0.0
D.255.255.255.0

單項(xiàng)選擇題

Which of the following is the IPv6 loopback address?（）

A.：：1
B.1.1.1.1
C.127.0.0.1
D.255.255.255.254

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