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CCNA题翻译In which circumstance are multiple copies of the same

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CCNA题翻译
In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched LAN?
A. during high traffic periods
B. after broken links are re-established
C. when upper-layer protocols require high reliability
D. in an improperly implemented redundant topology
E. when a dual ring topology is in use
CCNA题翻译In which circumstance are multiple copies of the same
问题：在哪种环境下,多个相同单播帧的拷贝在交换式的LAN里面传输?
A.高流量时
B.链路重接续后
C.上层协议需要高可靠性时
D.在一个配置不恰当有冗余的拓扑环境中
E.使用双环拓扑
答案应该是D
考点：
交换机冗余带来的问题
分析：
如果是一个交换机的冗余环境,并且还没有运行stp的情况下,这个时候就容易产生多个同样的单播帧可以传输到接收者.
但是这个和广播风暴比起来,挺微不足道的
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