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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 switches
B
speed mismatches when moving from a low-speed LAN environment to a higher speed WAN environment
C
flapping Ethernet interfaces caused by misconfigured LAN interfaces
D
flapping serial interfaces caused by misconfigured WAN interfaces
E
speed mismatches when moving from a high-speed LAN environment to a lower speed WAN environment
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