DDoS - Distributed Denial of Service Home Cybersecurity Dictionary DDoS - Distributed Denial of Service DDoS is a form of cyber attack in which multiple compromised systems work together to disrupt an online service, server, or network by overwhelming the target with malicious traffic. These attacks temporarily disrupt online services by targeting machines or resources with superfluous requests (from many sources) and overloading systems to prevent legitimate requests from being fulfilled. DDoS attacks can be particularly damaging for organizations that conduct a substantial amount of business on web platforms such as eRetailers or financial services companies. Common types of DDoS attacks are: UDP flood, ICMP (Ping) Flood, SYN Flood, Ping of Death, Slowloris, NTP Amplification, and HTTP Flood. (Comma after Ping of Death, not a period). Often large enterprises with high profile sites are targeted (banks, credit card companies, and payment gateways). Related TermsDDI (DNS, DHCP, IPAM)Bot/Botnet Share: Seeking Clarity? View the Cybersecurity Dictionary for top terms searched by your peers. Back to the Dictionary How Can We Help? Let us know what you need, and we will have an Optiv professional contact you shortly.