Theoretical foundations of information security.
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Any organization, regardless of its size, always has a corporate network. Even if you have a small office with only two or three computers, they should still be connected to a network and have Internet access. These are the realities of modern business, everyone needs access to e-mail, everyone needs access to information on the World Wide Web. However, local area networks are not limited to organizations. Often, many apartments have several computers, and each of them also needs access to Internet resources. For example, many users have a main computer, laptop, pocket computer or a communicator at home. To some extent, all these devices need to share files with each other and have Internet access. For the organization of such
Access points use active network equipment: routers, firewalls, switches, wireless access points, and hubs. Although the latter are becoming rarer. In general, now, as a rule, all-in-one devices are used to access the Internet for home users. That is, one device combines the functions of a firewall, a simple router, a switch, and a wireless access point. For home users, such a device is the best solution, since one "box" takes up less space, fewer wires need to be connected to it, and it is also easier to set up. In corporate networks with more than 20 workstations, they try not to use such solutions, since when connecting a large number of workstations at the same time, the performance of multifunctional network devices decreases dramatically. In addition, if such a device fails, you will lose both Internet access and access to the internal LAN. So, gentlemen system administrators, if your cheap Dlink works great on your home network, then don't rush to advise your management to buy the same cheap Dlink for the corporate network. First of all, you will have to solve the problems that will arise later.
But let's get back to network security issues. Any local network is inconceivable without network equipment. And there are a lot of different attacks against network devices aimed at intercepting information passing through the network, taking control of the device or temporarily disabling it.
Readers of my channel may have a question: why, when talking about the network, am I talking only about network equipment, because there are also many applications running on the network, such as database servers or email? My answer is this: undoubtedly, there are many different applications running on the network, but as part of the discussion of network security, we will discuss the operation of network equipment, since we will consider the operation of applications later..
However, before starting a discussion of how to carry out these attacks and means of protection, it is necessary to recall (I hope) the basics of network technologies, otherwise the material in the following sections may turn into a set of incomprehensible terms for readers of my channel. Of course, if you can immediately recall the OSI model, know what the Spanning Tree Protocol or PVLAN is, then you can safely wait for my next posts.
