问题：
[单选题]9.BPDU防护有何用途?
A.确保端口从正确的上游交换机那里收到了BPDU
B.禁止端口接收来自上游交换机的BPDU，而只接收来自根交换机的BPDU
C.可在启用了BPDU防护的端口上使用PortFast，在端口收到BPDU时将其关闭
D.在端口收到BPDU时将其关闭
Tags：计算机Cisco(思科)认证模拟试卷
答案解析：
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