单项选择题
Which of the following class networks represents a possibility of being further subnetted into 2 subnets of 128 hosts per subnet？（）
A.Class A B.Class B C.Class C D.Class D
单项选择题 WhichofthefollowingClassAnetworksisreservedfor"privatenetworks"useonly？（）
单项选择题 WhichofthefollowingoptionsisavalidhostIPaddress？（）
单项选择题 Whichofthefollowingcommandsshouldbeusedtolistalloftheactivenetworkinterfacesonasystem？（）
