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單項選擇題

You have been assigned the /24 network and need to segment it into at least 60 subnets. Which network mask meets this requirement?（）

A. /27
B. /28
C. /29
D. /30

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單項選擇題

Which network mask is the equivalent of 255.255.248.0?（）

A. /20
B. /21
C. /22
D. /23

多項選擇題

Which two protocols use UDP as a transport protocol by default?（）

A. Telnet
B. ICMP
C. DHCP
D. RIP