explain stept by step how do you find this asnwer( please write legible)

Consider transferring an enormous file of L bytes from Host A to Host B. Assume an MSS of 536 bytes. (a) What is the maximum value of L such that TCP sequence numbers are not exhausted? Recall that the TCP sequence number field has 4 bytes. (b) For the L you obtain in (a), find how long it takes to transmit the file. Assume that a total of 66 bytes of transport, network, and data- link header are added to each segment before the resulting packet is sent out over a 155 Mbps link. Ignore flow control and congestion control so A can pump out the segments back to back and continuously. (Hint: it is assumed that the window size N is large enough such that the segments can be sent out back to back without the need to wait for the next sequence number to be available and there is no loss of packet or ack.)