May 2018
Intermediate to advanced
326 pages
8h 32m
English
Content preview from Practical Network Scanning
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TCP/UDP/IP basic
To use an analogy, if IPs are a building address, service ports are flat numbers. Both TCP and UDP uses incoming and outgoing ports for data communication. Most IP-based services use standard ports (HTTP TCP:80, SMTP TCP:25, and DNS TCP-UDP:53).
TCP stack has six flag message types to complete a three-way handshake:
Here is a packet capture for one of the websites I opened on the web browser. This shows a three-way handshake with SYN-SYN-ACK. By default, Wireshark will keep track of all TCP sessions and convert all sequence numbers (SEQ numbers) and acknowledge numbers (ACK numbers) into relative numbers. This means that ...
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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.