Which of the following ATOM traffic encapsulations require the use of a Control Word？（）
- A、Cell relay
- B、aal5
- C、Ethernet VLAN
- D、Frame Relay
- E、HDLC
- F、PPP
正确答案:B,D
答案解析:有
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Which of the following ATOM traffic encapsulations require the use of a Control Word？（）
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