(a) Describe the cumulative ACK process used in the TransmissionControl Protocol (TCP).

(b) When the TCP receiver gets a packet that is out of order, itacknowledges again the last correctly received packet. How doesthis help to detect missing packets?

(c) Describe the other method the TCP protocol uses to detectmissing packets.

(d) Give a reason for inefficiently in the cumulative ACKprocess from the original TCP protocol.