$(20)$ Do the last example on Lecture $18$ again. What is the dominated delay in this connection? Can you improve the delay $($reduce$)?$ Why, why not?$5.(20)$ Redo the example. This time link transmission speed now is $1$ Gbit$/$s$.$ How long will it take Alice to receive the message up to the last bit? What is the dominated delay this time? Can you improve the delay $($reduce$)?$ Why, why not