Auserisunabletoconnecttothenetwork.Anetworktechnicianisabletodeterminethatthereisaproblemontheswitch.Allotherusersonthatswitchareabletoconnectsuccessfullytothenetwork.Whichofthefollowingisaprobablecause？（）
A.Switchingloopisoccurringontheswitch.
B.Wrongsubnetmaskontheswitch.
C.IncorrectSNMPsettingsontheswitch.
D.Portismisconfiguredontheswitch.
参考答案：D
