PLEASE EXPLAIN how answer was obtained.

Consider the following data: Host B has already received all bytes up through byte 126 from A. The bytes of data that are in first and second segments are 80 and 40 respectively. The sequence number of the first segment = 127. The source port number of the first segment = 302. The destination port number of the first segment = 80. d. Suppose the two segments sent by A arrive in order at B. The first acknowledgment is lost and the second acknowledgment arrives after the first timeout interval. Draw a timing diagram, showing these segments and all other segments and acknowledgments sent. (Assume there is no additional packet loss.) For each segment in your figure, provide the sequence number and the number of bytes of data; for each acknowledg- ment that you add, provide the acknowledgment number. ********** PLEASE REAPEAT PART d but now with the second ACK getting lost and the first one arriving fine