2. 计算机
  3. Which layer 2 protocol encapsulation type supports synchronous and asynchronous circuis and has built-in security mechanisms?

Which layer 2 protocol encapsulation type supports synchronous and asynchronous circuis and has built-in security mechanisms?

admin2019-04-08  10
问题 Which layer 2 protocol encapsulation type supports synchronous and asynchronous circuis and has built-in security mechanisms?
选项 A、        Frame Relay
B、        HDLC
C、        x．25
D、        PPP
答案D
解析
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