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network中的speed simulation模拟的是什么带宽？
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单选题What is the most common cause of network congestion？（）A
aggregation congestion occurring at the core layer where the different distribution layer devices feed traffic to the core-layer switchesB
speed mismatches when moving from a low-speed LAN environment to a higher speed WAN environmentC
flapping Ethernet interfaces caused by misconfigured LAN interfacesD
flapping serial interfaces caused by misconfigured WAN interfacesE
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对B
错
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MAC filteringB
IP addressC
PoED
Port speed
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问答题network中的speed simulation是模拟的什么带宽？
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