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Introduction to Networking | Computer Security

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To discuss network security, first we need to know how the network is designed. This section provides a (simplified) overview of the various Internet layers and how they interact. A video version of this section is available: see Lecture 11, Summer 2020. The primary goal of the Internet is to move data from one location to another. A good analogy for the Internet is the postal system, which we’ll refer to throughout this section. The first building block we need is something that moves data across space, such as bits on a wire, radio waves, carrier pigeons, etc. Using our first building block, we can connect a group of local machines in a local area network (LAN). Note that in a LAN, all machines are connected to all other machines. This allows any machine on the LAN to send and receive messages from any other machine on the same LAN. You can think of a LAN as an apartment complex, a local group of nearby apartments that are all connected. However, it would be infeasible to connect eve

Introduction to Networking | Computer Security Skip to main content Menu Expand (external link) Document Search Copy Copied Computer Security 25. Introduction to Networking To discuss network security, first we need to know how the network is designed. This section provides a (simplified) overview of the various Internet layers and how they interact. A video version of this section is available: see Lecture 11, Summer 2020 . 25.1. Local Area Networks The primary goal of the Internet is to move data from one location to another. A good analogy for the Internet is the postal system, which we’ll

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