多项选择题
A.The TCAM has reached capacity
B.An unknown destination MAC address
C.A packet being discarded due to a security violation
D.A Telnet packet from a session being initiated with the switch
E.Routing protocols sending broadcast traffic
F.A packet belonging to a GRE tunnel
单项选择题 AnewrouterisaddedtoanexistingHSRPstandbygroup.Oneoftheexistingroutersisinanactivestate，theotherisinastandbystate.Underwhatcircumstancewillthenewrouterbecometheactiverouter？（）
单项选择题 Howlongwillaportremaininthelisteningstatebydefault？（）
多项选择题 WhichofthefollowingcommandscanbeusedtogatherinformationabouttheAS-PATHofaBGProute？（Chooseallthatapply.）（）