单项选择题
Which of the following functions does the "ifconfig en4 down" perform？（）
A.Removes the en4 interface B.Removes the en4’s network route C.Stops all traffic through the en4 interface D.Stops all traffic through the en4 and removes its network route from the routing table
单项选择题 Whenchoosingahostname，whichofthefollowingnamingconventionsismostimportanttoconsider？（）
单项选择题 Atboottime，whichofthefollowingservicesutilizesacentralservertoassignIPaddressestoahost？（）
单项选择题 AllofthefollowingareinvolvedinaddingorremovingroutesfromtheAIXroutingtableEXCEPT：（）。
