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L2TP over IPSEC 中，加密数据流可以根据什么来确定（）
- A、 远程接入用户的IP 地址范围
- B、 L2TP 协议使用的UDP 端口号1701
- C、 L2TP 协议使用的TCP 端口号1701
- D、 以上说法均不正确
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