Q58

Frames of $1000\text{ bits}$ are sent over a $10^6$ bps duplex link between two hosts. The propagation time is $25ms$. Frames are to be transmitted into this link to maximally pack them in transit (within the link). Let $I$ be the minimum number of bits $(I)$ that will be required to represent the sequence numbers distinctly assuming that no time gap needs to be given between transmission of two frames. Suppose that the sliding window protocol is used with the sender window size of $2^{I}$, where $I$ is the numbers of bits as mentioned earlier and acknowledgements are always piggy backed. After sending $2^I$ 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)