Which Layer 2 protocol encapsulation type supports synchronous and asynchronous circuits and has built-in security mechanism?

Which Layer 2 protocol encapsulation type supports synchronous and asynchronous circuits and has built-in security mechanism?

Which Layer 2 protocol encapsulation type supports synchronous and asynchronous circuits and has built-in security mechanism?

A.
Frame Relay

B.
X.25

C.
ppp

D.
HDLC



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