March 2026
Intermediate to advanced
400 pages
15h 45m
English
Content preview from WIRELESS & MOBILE DEVICE SECURITY Third Edition, 3rd Edition
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Networking and the Open Systems Interconnection Reference Model
Before examining how wired networks evolved into wireless networks, it’s important to have a fundamental grasp of basic networking. The logical place to start is the Open Systems Interconnection (OSI) Reference Model. Initially proposed in 1984, the OSI Reference Model was the industry’s response to the issues created by proprietary data networking and equipment development at the dawn of the networking era. These proprietary methods included unique communication protocols, connection interfaces, and procedures for data storage and retrieval, to name a few. In some cases, vendors did this because much of the development in this area was new. But many insisted on going their own ...
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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.