单项选择题
What are the mandatory， well-known BGP attributes？（）
A.origin,AS-path,next-hop
B.AS-path,origin,MED
C.AS-path,origin,weight
D.AS-path,weight,MED
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问答题
R1收到组播信息而R2收不到，why？ -
单项选择题
YouuseOSPFasyournetworkroutingprotocol.YouusethecommandshowiprouteandyouseeseveralroutesdescribedasO，OIA，OE1，andOE2.Whatroutesareinyourarea？（）
A.O IA
B.O E1
C.O E2
D.O -
单项选择题
YourCisconetworkcurrentlyrunsOSPFandyouhaveaneedtopolicy-routesomespecifictraffic，regardlessofwhattheroutingtableshows.Whichoneoftheseoptionswouldenableyoutopolicy-routethetraffic？（）
A.source IP address and the protocol （such as SSL， HTTPS， SSH）
B.the packet Time to Live and the source IP address
C.type of service header and DSCP value
D.destination IP address
