Sketch the network topology.

b$.$ Calculate the latency to successfully deliver one VoIP packet with $640$Byte payload $($as described in

Problem $3.$b$.$ above$)$ from the source to the source$$s edge router, where a successful delivery is indicated

by the successful return of an ACK packet.

c$.$ Suppose the probability that a packet is successfully delivered on one link is $50\%.$ Re$-$calculate the latency

and link efficiency from a$.$ and b$.$

d$.$ Calculate the latency to successfully deliver one VoIP packet with $640$Byte payload $($as described in

Problem $3.$b above$)$ from the source all the way to the destination, where a successful delivery is

indicated by the successful return of all ACK packets. Assume the acknowledgements are hop$-$by$-$hop, I.e$.,$

each device that receives a packet returns an ACK packet