In order to support IP service over an ATM network, IP datagrams must first be segmented into a number of ATM cells before sending them over the ATM network. As ATM does not provide cell loss recovery, the loss of any of these cells will result in the loss of the entire IP packet. Given:

PC = cell loss rate in the ATM network n = number of cells required to transmit a single IP datagram PP = IP@packet loss rate

a. Derive an expression for PP, and comment on the resulting expression.

b. What ATM service would you use to get the best possible performance?