单项选择题
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
单项选择题 Which network mask is the equivalent of 255.255.248.0?（）
多项选择题 Which two protocols use UDP as a transport protocol by default?（）
多项选择题 Which three protocols use UDP as a transport protocol by default?（）
