What is a DDoS attack?

A DDoS attack is a form of computer attack in which an attacker attempts to overwhelm a server, network or application with excessive traffic, so as to make it unavailable to its legitimate users. The term « DDoS » stands for « Distributed Denial of Service », indicating that the attack originates from multiple sources or compromised computers, often scattered around the world.

How does a DDoS attack work?

DDoS attacks are generally orchestrated using a network of compromised machines, known as a « botnet ». The owners of these machines are often unaware that they have been infected. Once a botnet is in place, the attacker can launch an attack by directing a large amount of traffic to the target, thereby exceeding its processing capacity.

Why are DDoS attacks carried out?

The motivations behind DDoS attacks vary. They can be used to extort money, to express political opposition, to distract defenders while another attack is carried out, or simply for the pleasure of causing online disruption.

Prevention and response

Preventing DDoS attacks is a challenge, but there are steps organizations can take to reduce their vulnerability. These include the use of firewalls, DDoS protection services, and constant monitoring of network traffic. In addition, rapid response in the event of an attack is essential. This can include isolating malicious traffic, blocking suspicious IP addresses, and increasing bandwidth capacity.


DDoS attacks continue to threaten online stability and security. Understanding how they work, and putting strategies in place to prevent and respond to them, is essential for businesses and individuals who depend on online availability. With a combination of security technologies, vigilance and responsiveness, it is possible to reduce the risks associated with DDoS attacks and maintain business continuity online.