【单项选择题】
Study the exhibit shown below carefully.<br /> <img src="https://img.ppkao.com/2018-07/gelingxia/2018073016082497941.jpg" /><br /> In this scenario the service provider wants to ensure that switch S1 is the root switch for its own network and the network of . <br /> On which interfaces should root guard be configured to ensure that this happens？（）<br /> <p> Study the exhibit shown below carefully.<br /> <img src="https://img.ppkao.com/2018-07/gelingxia/2018073016082497941.jpg" /><br /> In this scenario the service provider wants to ensure that switch S1 is the root switch for its own network and the network of . <br /> On&ensp
A、A.Interfaces 11 and 12
B、B.Interfaces 1， 2， 3， and 4
C、C.Interfaces 5 and 6
D、D.Interfaces 5， 6， 7， and 8
E、E.Interfaces 1 and 2
F、F.Interfaces 1， 3， 5， and 6
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