Suppose you need to deliver a large file between two computers that are $200$ km apart

and connected by a direct link. This question analyzes when it is faster to drive the data between the

two locations, rather than transmit the data. Suppose the station wagon drives $100$ km$/$hour and the link

has a bandwidth of $1$Mbps$.$

$1)$ Suppose that the data transfer can fully consume the link bandwidth, with no additional overhead.

At what file size $($in MB$)$ does the station$-$wagon solution start delivering the data faster?

$2)$ For the file size in $(1),$ suppose the sender transmits the file as packets with a $16-$byte IP header, and

$16-$byte TCP header, and a maximum segment size of $512$ bytes. The speed of electricity in a copper

cable is $2\backslash$times $108$ meters$/$second$.$ Sender won$$t transmit the next packet unless the ACK of the previous

packet is received. In this case, how long will it really take to finish $($until the last ACK received$)$ the

transmission?