问题：
[单选题]6.下面哪种说法正确地描述了已会聚的生成树网络?
A.所有交换机和网桥的端口都处于转发状态
B.所有交换机和网桥的端口要么是根端口要么是指定端口
C.所有交换机和网桥的端口要么处于转发状态要么处于阻断状态
D.所有交换机和网桥的端口要么处于阻断状态要么处于环回状态
Tags：计算机Cisco(思科)认证模拟试卷
答案解析：
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