Functions of OSI and TCP/IP Layers Q.58

58Consider a TCP connection in a state where there are no outstanding ACKs. The sender sends two segments back to back. The sequence numbers of the first and second segments are 230 and 290 respectively. The first segment was lost, but the second segment was received correctly by the receiver.
Let X be the amount of data carried in the first segment (in bytes), and Y be the ACK number sent by the receiver. The values of X and Y (in that order) are

Option : D
Explanation : Data in 1st segment is from 230 to 289 (byte number) i.e. 60 bytes data.
As given 1st segment is lost so, TCP will send ACK for the next in-order segment receiver is expecting. So it will be for 230.

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