问答题

简答题 what is portfast？

【参考答案】

Port Fast immediately brings an interface configured as an access or trunk port from a blocking state to the forwarding state， bypassing the listening and learning states.

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热门试题

问答题What’sPHB？

单项选择题Whatarethemandatory，well-knownBGPattributes？（）

A.origin,AS-path,next-hop
B.AS-path,origin,MED
C.AS-path,origin,weight
D.AS-path,weight,MED

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