Let's start our discussion with TCP IP stack physical and data link layer. In this course, we will start from this layer and go up layer by layer on the TCP IP model. Now, you might ask, how is the physical layer related to D those, I mean, there's nothing related to DDoS going on over this layer actually. And as a matter of fact, it's true. However, when we think about what DDoS does, as we just discussed in the introduction, it basically interrupts your services. This is what the consequences of DDoS are all about.

So if you don't take care of your infrastructure physically, then the result is the same as DDoS. That is, your services will be unavailable. Therefore, it's important that while taking care of all these technical aspects, which I'll be talking about throughout the course, it's also important to make sure that you take care of this physical aspect as well, because you might be perfect at all this technical stuff, all these protections, firewalls, etc. But if your servers aren't not protected at all physically. In other words, for example, if anybody can access to those servers and do whatever he wants physically, then what is the point of implementing all these sophisticated technical DDoS solutions, right. So there are two options.

The first one is having your own server which is not a recommended from DDoS perspective, because in that case, you need to take care of all the physical accesses ups, meaning uninterrupted electricity, physical monitoring and cooling of the servers and all other equipment and etc. So, this option requires you to take care of all of those by yourself. However, by delegated to suppliers, like it can be cloud solution or any kind of other service provider, it will be the responsibility. Of course, before deciding which cloud solution or resource to choose, you need to ask them about all of these aspects like you need to ensure that for example, they have proper physical access control. They have all these ups protections implemented They have all these monitoring and they are taking care of cooling and etc. Especially if you're going to serve sensitive data.