单项选择题 Which configuration command builds a read-write SNMP community named operator?（）

单项选择题 The policy action of color is used for congestion control under which circumstance?（）

多项选择题 You have configured a Classifier Access Control List(CLACL)with multiple match clauses.Each match clause has multiple defined fields within it.Which two statements describe how the router evaluates this CLACL?（）