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Denial of Service (DoS) is an attack is which the perpetrator seeks to make a machine or network resource unavailable to its intended users, by temporarily disrupting services of a host, making it difficult or impossible for legitimate users to use them.
Traditionally, Denial-of-Service (DoS) attacks have been network based, with a malicious user flooding a target machine with enough traffic to make it incapable of servicing its intended users. When the attack is launched by leveraging a large number of machines, the attack is called a Distributed Denial-of-Service (DDoS) attack.
Dos vs DDoS, A DoS attack is a denial of service attack where a computer is used to flood a server with TCP and UDP packets. A DDoS attack is where multiple systems target a single system with a DoS attack. The targeted network is then bombarded with packets from multiple locations.
In order to prevent a DoS attack, you must develop a denial of service response plan, include key elements, such as, Systems Checklist, form a response team, define notification and escalation procedures. Having a level of your network infrastructure secure, including threat management systems. Gathering your team and practising basic network security, engaging in strong security practices and maintaining strong network architecture.