In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched LAN?

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问题 In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched LAN?

选项 A、 after broken links are re-established
B、 in an improperly implemented redundant topology
C、 when upper-layer protocols require high reliability
D、 during high traffic periods
E、 when a dual ring topology is in use

答案B

解析题目问在哪一个环境下交换机在lan出现多个相同的单播帧
A链路断后重启
B拓扑中有不合适的冗余，正确
C上层协议需要高可靠度
D在高流量的阶段
E在双环拓扑

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In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched LAN?

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