单项选择题
A.Class A
B.Class B
C.Class C
D.Class D
单项选择题 Givenanewimplementation，whichofthefollowingproceduresshouldbeusedtodetermineadefaultgateway’sIPaddress？（）
单项选择题 AclassBnetwork129.35has4subnetsandanetmaskof255.255.252.0（11111111.11111111.11111100.00000000）.TowhichofthefollowingsubnetswilltheclassBnetworkdeliverapacketofaddress129.35.14.04（10000001.00100011.00001110.00000100）？（）
单项选择题 AnetworkadministratorprovidesanIPaddressof128.135.0.142andasubnetmaskof255.0.0.0.Onceapingisattempted，itfails.Whichofthefollowingoptionsisthemostprobablecauseofthefailedping？（）