Hi,
If PC A sends a packet (ACK = 80, Sequence Number = 1450, Payload = 1460), PC B will send an ACK Message (ACK = 2910, Sequence Number = RANDOM).
The SeqNo from PC B much depends on whether PC B is also sending data to PC A because that would mean that there is some data in flight already sent by PC B but not yet seen by PC A. For simplicity purposes, if for some time in the past, PC B was silent, then PC B will send a TCP segment with AckNo=1450+1460=2910, SeqNo=80.
Best regards,
Peter
