问答题
Port Fast immediately brings an̳......
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What’sPHB？
问答题What’s PHB？
Whatarethemandatory，well-knownBGPattributes？（）A.origin,...
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
R1收到组播信息而R2收不到，why？
