单项选择题
A.To use ftp and telnet
B.To perform NFS mounts
C.To make /etc/hosts files unnecessary
D.To reduce network traffic and save bandwidth
单项选择题 WhendividinganexistingClassBnetworkinto2subnetsof32，766hostseach，whichofthefollowingsubnetmasksshouldbeused？（）
单项选择题 Ahostistobecomepartofahierarchicalnamingtopology.Whichofthefollowingservicesarerequired？（）
单项选择题 ToaddaTTYTerminaltoSerialport1，whichofthefollowingsetofoptionsshouldbechosen？（）