单项选择题 Refer to the exhibit. Voice traffic is marked "precedence 5." How much bandwidth is allocated for voice traffic during periods of congestion？（）

问答题 As 2 产生A的BGP路由，R1上分别设置了weight， local-precedence如图所示：问R1要到A，把数据包给谁？

多项选择题 InLayer2topologies，spanning-treefailurescancauseloopsinthenetwork.Theseunblockedloopscancausenetworkfailuresbecauseofexcessivetraffic.WhichtwoCatalyst6500featurescanbeusedtolimitexcessivetrafficduringspanning-treeloopconditions？（）