fig shows an example of frames transmission from the Sending Node to the Receiving Node using Stop-and-Wait Protocol. Redraw Figure using the following scenario:

a. The first frame is sent and acknowledged.

b. The second frame is sent and acknowledged, but the acknowledgement is lost.

c. The second frame is resent, but it is time-out.

d. The second frame is resent and acknowledged.

Figure shows the flow diagram for the CSMA/CD. Find the probability that a station can send immediately in each of the following case. a. After 1 failure. b. After 3 failures.

Receiving node Data-link Sending node Network Network Data-link Packet Frame :Packet Legend Start the timer Stop the timer Restart a time-out timer Packet Frame Lost Frame (resent Packet Notes A lost frame means either lost or corrupted. A lost ACK means either lost or corrupted. : Packet Frame Packet ACK Lost Frame (resent Packet AC :Duplicate Time Time Time Time Receiving node Data-link Sending node Network Network Data-link Packet Frame :Packet Legend Start the timer Stop the timer Restart a time-out timer Packet Frame Lost Frame (resent Packet Notes A lost frame means either lost or corrupted. A lost ACK means either lost or corrupted. : Packet Frame Packet ACK Lost Frame (resent Packet AC :Duplicate Time Time Time Time