单选题Which layer 2 protocol encapsulation type supports synchronous and asynchronous circuis and has built-insecurity mechanisms？（）AFrame RelayBHDLCCx.25DPPP
单选题
Which layer 2 protocol encapsulation type supports synchronous and asynchronous circuis and has built-insecurity mechanisms？（）
A
Frame Relay
B
HDLC
C
x.25
D
PPP
参考解析
解析：
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