Q55

It is necessary to design a link-layer protocol between two hosts that are directly connected over a lossless link of length $3000$ kilometers. Assume that the link bandwidth is $10^{8}$ bits per second and that the propagation delay in the link is $5$ nanoseconds per meter. Every transmitted data byte is assigned a unique sequence number. Let $N$ be the minimum number of bits needed for the sequence number field in the protocol header such that The value of $N$ is $\_\_\_\_$ . (answer in integer)