Safari Books Online is a digital library providing on-demand subscription access to thousands of learning resources.
- Create BookmarkCreate Bookmark
- Create Note or TagCreate Note or Tag
- DownloadDownload
- PrintPrint
Chapter 2. Networks and the Internet > Advanced Network Communications Topics
Advanced Network Communications Topics
These subjects are not absolutely required for you to understand this book, but they will give you a broader understanding of networks in general. If you have any intention of delving into network security on a professional level, then you will need this information—and much more.
The OSI Model
Let’s begin with the OSI model, or Open Systems Interconnection model. This model is a description of how networks communicate. It describes the various protocols and activities, and it tells how the protocols and activities relate to each other. This model is divided into seven layers, as shown in Table 2.5, and was originally developed by the International Standards Organization (ISO) in the 1980s.
