下图表示一个局域网的互连拓扑，方框中的数字是网桥ID，用字母来区分不同的网段。按照IEEE802.1d协议，ID为（ ）的网桥被选为根网桥，如果所有网段传输费用为1，则ID为92的网桥连接网段（ ）的端口为根端口。
问题1选项
A.3
B.7
C.92
D.12
问题2选项
A.a
B.b
C.d
D.e
正确答案及解析
正确答案
解析
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