有一道疑问的问题

byrand

V104.4           4月9号的题库中，在415题
In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched   LAN?

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
Answer: E
Explanation/Reference:
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
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，正确


小弟对这套题目的答案存在质疑，偏向于选择B，希望能够得到大虾的解惑

sunwei335

就是B啊~~~我考试看的题库这题答案就是B

byrand

楼上的兄弟，考过NA了吗？
这道题也在考试出现过，是不？