TCP seq. #’s and ACKs
Seq. #’s:
- byte stream “number” of first byte in segment’s data
ACKs:
- seq # of next byte expected from other side
- cumulative ACK
Q: how receiver handles out-of-order segments
- A: TCP spec doesn’t say, - up to implementor
Seq=42, ACK=79, data = ‘C’
Seq=79, ACK=43, data = ‘C’