Thanks for the link. Maybe part of my confusion stems from this:-
Data ---- Application, Presentation, and Session layer
Layer 4 - --Transport (Segments)
Layer 3 --- Network (Packets)
Layer 2 ----Data Link( Frames)
Layer 1 --- Physical (Bits)
So frame-relay layer 2. How can I relate frame relay to Bits?
Most of the frame relay services use T-carrier or E-carrier systems in telecommunication world. (http://en.wikipedia.org/wiki/T-carrier) Frame relay rely other standard and protocol to operate in layer 1. There is no layer 1 standard specific to frame relay. Although people sometime losely use between T-carrier and frame relay terms. (such as T1 wire pin-out and frame-relay wire pin-out)
Thanks for the diagram, very detailed
What I am worried about is questions like this:
At what layer of the OSI reference model does FRAME-RELAY
So if they say choose two(answer is F,B) and choose one(answer is F).
Message was edited by: chemilio