Question $($AA$)-$With the help of a diagram, explain the layer$-$to$-$layer communication happening between two devices connected through intermediate node$($s$)$ with reference to OSI model. Explain Statistical time division multiplexing. Ten $2400-$bps lines are to be multiplexed

Question $(4$B$)-$using TDM$.$ Assuming that we wish to limit average TDM link utilization to $0\mathrm{.}6,$ and assuming that each TDM link is busy $60\%$ of the time, what is the capacity required for

statistical TDM$?$

Question $(4$C$)-$ Explain the different levels of addresses used in a network and map them to corresponding layers of TCP$/$IP architecture.