March 2018
Intermediate to advanced
626 pages
17h 32m
English
book
Network Analysis Using Wireshark 2 Cookbook - Second Edition
by Nagendra Kumar Nainar, Yoram Orzach, Yogesh Ramdoss
Content preview from Network Analysis Using Wireshark 2 Cookbook - Second Edition
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Regular operation of the TCP sequence/acknowledge mechanism
One of the mechanisms that is built into TCP is the retransmission mechanism. This mechanism enables the recovery of data that is damaged, lost, duplicated, or delivered out of order.
This is achieved by assigning a sequence number to every transmitted byte, and expecting an acknowledgment (ACK) from the receiving party. If the ACK is not received within a timeout interval, the data is retransmitted.
At the receiver end, the sequence numbers are used to verify that the information comes in the order that it was sent in. If not, rearrange it to its previous state.
This mechanism works as follows:
- At the connection establishment, both sides tell each other what their initial sequence ...
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