Consider Token$-$Passing schemes for a network with $50$ stations, link capacity of $32$ Mbps$,$ and a total

propagation delay around the virtual ring topology of $20$ms$.$ Assume no network problems or TX errors below.

a$.(5\%)$ How long will it take for a station to know that its own msg $(12$ KB$)$ is successfully received by the

receiver by using either $$release$-$after$-$reception $($RaR$)$ or $$release$-$after$-$transmission$($RaT$)?$ Is there a

difference between the two schemes? Assume the token transmission time can be ignored.

b$.(5\%)$ Will your answer in Part a change if other stations are trying to transmit at the same time? Why?

c$.(5\%)$ What if there are N$(<=50)$ stations have the same size msg $(12$KB$)$ to transmit? How long will it

take for ALL stations to know that their msg are successfully received under RaR and RaT?

d$.(5\%)$ What would be a reasonable timer to indicate something went wrong for this network?