Which layer 2 protocol encapsulation type supports synchronous and asynchronous circuis and has built-in security mechanisms?（）
- A、Frame Relay
- B、HDLC
- C、x.25
- D、PPP
正确答案:D
答案解析:有
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Which layer 2 protocol encapsulation type supports synchronous and asynchronous circuis and has built-in security mechanisms?（）
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