A Denial of Service Attack is when an attacker takes action that prevents legitimate users from accessing targeted networks, computer systems or devices.
DoS (Denial of Service) attacks typically weak servers where the security configuration is not complete or strong and doesn't have a way to predict these attacks and stop it. The Dos start sending a lot of false users to a server, requesting a lot of calls, where the server will break with many petitions.
Here are a great video that explains how works a Denial of Service
How can I protect my devices or server for DoS?
You have to know that it is impossible to prevent, but you can be ready to stop it. Is important that you have a tech person in your IT Department that can help you with this, also is important to follow the basics security practices and get support for different softwares that help you to determined when you are being attacked by Dos.
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