What is a DDoS attack

A distributed denial of service (DDoS) attack is when an attacker, or attackers, attempt to make it impossible for a service to be delivered. This can be achieved by thwarting access to virtually anything: servers, devices, services, networks, applications, and even specific transactions within applications. In a DoS attack, it’s one system that is sending the malicious data or requests; a DDoS attack comes from multiple systems.
Generally, these attacks work by drowning a system with requests for data. This could be sending a web server so many requests to serve a page that it crashes under the demand, or it could be a database being hit with a high volume of queries. The result is available internet bandwidth, CPU and RAM capacity becomes overwhelmed.
Whether DoS or DDoS, the result is the same—legitimate users are unable to connect to the resources they are intended to have access to. DDoS attacks are one of the most effective ways for malicious actors to violate availability, the third of three foundational security principles—confidentiality, integrity, and availability
The impact could range from a minor annoyance from disrupted services to experiencing entire websites, applications, or even entire business taken offline.
More Info: preventing denial of service attack

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