$1)(4$ points$)$ Consider transferring an enormous file of L bytes from Host A to Host B$.$ Answer the following questions:

a$)$ Assume an MSS of $880$ bytes and the TCP sequence number field has $4$ bytes. What is the maximum value of L such that TCP sequence numbers are not exhausted? $(2$ points$)$

b$)$ Assume that a total of $56$ bytes of transport, network, and data$-$link header are added to each segment before the resulting packet is sent out over a $200$ Mbps link. Ignore flow control and congestion control so A can pump out the segments back to back and continuously. For the L you obtain in $($a$),$ find how long it takes to transmit the file. $(2$ points$)$