A Denial of Service (DoS) attack is a cyber attack that disrupts a website, server, or network by overwhelming it with excessive traffic. The goal of a DoS attack is to make a service slow, unstable, or completely unavailable to legitimate users. Instead of stealing data, attackers focus on causing downtime, which can damage a company’s reputation, reduce productivity, and lead to financial loss.
DoS attacks work by sending more requests to a system than it can handle. Every server has limited resources such as bandwidth, memory, and processing power. When an attacker floods the system with traffic, these resources become exhausted. As a result, real users cannot access the website or service. In many cases, the system may crash entirely.
Attackers use different techniques to launch a DoS attack. Some send repeated connection requests, while others exploit weaknesses in software to consume resources more efficiently. Regardless of the method, the outcome remains the same: the service becomes unavailable.
It is important to understand the difference between a DoS attack and a Distributed Denial of Service (DDoS) attack. A DoS attack originates from a single device, which limits its scale and impact. In contrast, a DDoS attack uses multiple devices, often part of a botnet, to send traffic simultaneously. This distributed approach makes DDoS attacks far more powerful and difficult to stop.
Organisations can reduce the risk of DoS attacks by using firewalls, traffic filtering, and scalable infrastructure. Monitoring traffic patterns also helps detect unusual activity early. By preparing in advance, businesses can maintain service availability and protect their systems from disruption.
