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？（）

单项选择题 Refer to the exhibit. In the diagram, the switches are running IEEE 802.1w RSPT. On which ports should root guard be enabled in order to facilitate deterministic root bridge election under normal and failure scenarios? （）