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?（）
A.GE-1/2 and GE 2/1 B.GE-1/1 and GE-2/2 C.GE-3/2 and GE 4/1 D.no ports are in the blocking state E.There is not enough information to determine which ports are in the blocking state
多项选择题 WhattwofeaturesinCiscoswitcheshelppreventLayer2loops？（）
问答题 ipv6Solicited-NodeMulticastAddress有什么作用，2个作用只要说出一个？
单项选择题 SpanningTreeProtocolcalculatespathcostbasedonwhichofthese？（）
