多项选择题
A.HDLC
B.Ethernet
C.Token Ring
D.PPP
E.FDDI
F.Frame Relay
单项选择题 Arouterreceivesinformationaboutnetwork192.168.10.0/24frommultiplesources.Whatwilltherouter considerthemostreliableinformationaboutthepathtothatnetwork?（）
多项选择题 WhichofthefollowingdescribestherolesofdevicesinaWAN?(Choosethree.)（）
多项选择题 Whichofthefollowingstatementsaretrueregardingbridgesandswitches?(Choose3.)（）