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none, the packet is dropped
both byte values on the segments will have a value of 5
bytes 4 and 5
bytes 5 and 6
For the segments in step 3, byte values should be 4 and 5. As shown in the graphic, Receiver's window size is 3 while the Sender has a window size of 4. This means that the sender is able to send 4 bytes but the receiver can only accept 3 so it will drop some of the bytes (4). Notice that the ACK sent by the receiver to the sender is 4, which means the receiver is now ready to accept byte 4 from the sender (retransmitted). In step 4 (Receiver side), the ACK is 6, which means it receives bytes 4 and 5 so it is now ready to accept byte 6 (..or this is what the receiver expects to receive). (http://www.firewall.cx/networking-topics/protocols/tcp/137-tcp-window-size-checksum.html)
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