A $64-$kilobyte message is to be transmitted over two hops in a network. The network limits packets to a

maximum size of $2$ kilobytes, and each packet has a $32-$byte header: $[1968$ Bytes $|32$ Bytes$]=[2,000$

Bytes$]$ maximum size packet. The transmission lines in the network are error free and have a speed of $50$

Mbps$.$ Each hop is $1000$ km long, and the signal speed is $2\mathrm{.}8$x$10^(8)$ m$/$s$.$ Processing time is neglible.

a$.$ How long does it take to get the message from the source to the destination?

b$.$ Calculate the link efficiency of this connection, assuming ACKs are returned for each packet.