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单选题
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
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单选题What is the role of route preference?（）A
It is used as a tie breaker when the same prefix is available through multiple sourcesB
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It is used to select the best route between multiple equal-cost pathsD
It is used to select which routing table to use for forwarding
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