October 2020
Intermediate to advanced
481 pages
17h 35m
English
Content preview from Network Security, Firewalls, and VPNs, 3rd Edition
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Differences Between Layer 2 and Layer 3 VPNs
One distinguishing component of current VPNs is the use of a variety of transport protocols to establish connections. This is helpful not only because the protocols have different capabilities, encryption strengths, and authentication mechanisms, but because each can run at different layers of the Open Systems Interconnection (OSI) Reference Model. The OSI model is the standard seven-layer conceptual tool that describes protocols and their corresponding functions. Each layer communicates with its peer layer on the other end of a communication session. Although the OSI model is helpful in discussing protocols, most protocols are not in full compliance with it.
In the case of VPNs, the protocols ...
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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.
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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.