Abstract
AbstractThis chapter will give a very condensed overview of the Internet. section 1.1 offers basic facts about the 4-layer TCP/IP communication model and a short comparison with the 7-layer OSI model. These 4 layers help to structure this book: Sections 5 to 7 belong to the link layer, chapter 8 to the IP layer, sections 9 to 13 right above the transport layer, and sections 14 to 20 to the application layer. At the beginning of each section, additional information will be given on the TCP/IP technologies discussed there. In section 1.2, we summarize some well-known threats to Internet security. These threats are why the security technologies discussed in this book are deployed. The concluding section 1.3 briefly relates cryptography to the threats described in the previous section.
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