4. Calculate the total time required to transfer a 500-KB file in the following cases, assuming an RTT of 50 ms, a packet size of IKB and an initial 2 x

RTT of "handshaking" before data is sent. Hint: Count the transfer as completed when the last data bit arrives at its destination. a) The bandwidth is 1Mbps, and data packets can be sent continuously. (7 points) Page 315 b) The bandwidth is 1Mbps, but after we finish sending each data packet, we must wait for one RTT before sending the next. (7 points) c) The bandwidth is "infinite," meaning that we take transmit time to be zero, and up to 20 packets can be sent per RTT. (6 points)