June 2018
Beginner
164 pages
3h 31m
English
Content preview from Wireshark 2 Quick Start Guide
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Understanding the TCP header and its various flags
The TCP header is normally 20 bytes long, but at times, due to the presence of the Options field, the TCP header size can vary up to 60 bytes. The following is an illustration of a simplified TCP header:
The following is a brief explanation for each of the TCP header fields:
- Source port: Used by the sending side to keep track of existing data streams and new incoming connections.
- Destination port: Port number associated with the services offered by the destination.
- Sequence and acknowledgment numbers: Each side uses a sequence number to keep track of ordering of the packets. Acknowledgment ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.