【多项选择题】
Which two series of Cisco Catalyst switches， when placed in the distribution layer， effectively pass high amounts of network traffic between the core and access layers while aggregating access？ （）
A、A. Cisco Catalyst 2800
B、B. Cisco Catalyst 3550
C、C. Cisco Catalyst 3750
D、D. Cisco Catalyst 4500
E、E. Cisco Catalyst 6500
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