多项选择题
When you are troubleshooting duplex mismatches， which two errors are typically seen on the full- duplexend？（）
A.runts B.FCS errors C.interface resets D.late collisions
单项选择题 WhichcommandisusedtoenableEtherChannelhashingforLayer3IPandLayer4port-basedCEF？（）
单项选择题 Refer to the exhibit. In the diagram， the switches are running IEEE 802.1s MST. Which ports are in the MST blocking state？（）
单项选择题 WhichstatementistrueaboutTCNpropagation？（）
