July 2026
Intermediate
729 pages
33h 9m
English
Content preview from Ethical HackingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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4 Scanning
In this chapter, we will look at how to scan ports and the services behind them. You will learn the following:
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What ports and services are
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How the OSI model is structured and what it is used for
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How the HTTP, ICMP, UDP, and TCP protocols work
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How to work with Wireshark
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What scanning techniques are available and how to implement them with Nmap
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What banner grabbing is
4.1 Ports and Services
In the field of network technology, a port is a logical address that enables data streams to be assigned to specific services or applications on a computer. To help explain the term clearly, we can make an analogy with traditional postal mail: if you want to send a letter to someone, you need a complete address consisting of the ...
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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.