Suppose that the sliding window protocol is used with the sender window size of 21, where 1 is the number of its identified in the earlier part and acknowledgments are always piggy backed. After sending 21 frames, what is the minimum time, the sender will have to wait before starting transmission of the next frame? (Identify the closest choice ignoring the frame processing time.)

Suppose that the sliding window protocol is used with the sender windo

1.	Suppose that the sliding window protocol is used with the sender window size of 21, where 1 is the number of its identified in the earlier part and acknowledgments are always piggy backed. After sending 21 frames, what is the minimum time, the sender will have to wait before starting transmission of the next frame? (Identify the closest choice ignoring the frame processing time.)
A.	16 ms
B.	18 ms
C.	20 ms
D.	22 ms
Answer» C. 20 ms

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