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---
title: DoS attack
slug: Glossary/DOS_attack
page-type: glossary-definition
---
{{GlossarySidebar}}
**Denial of Service (DoS)** is a network attack that prevents legitimate use of {{glossary("server")}} resources by flooding the server with requests.
Computers have limited resources, for example computation power or memory. When these are exhausted, the program can freeze or crash, making it unavailable. A DoS attack consists of various techniques to exhaust these resources and make a server or a network unavailable to legitimate users, or at least make the server perform sluggishly.
There are also Distributed Denial of Service (DDoS) Attacks in which a multitude of servers are used to exhaust the computing capacity of an attacked computer.
### Types of DoS attack
DoS attacks are more of a category than a particular kind of attack. Here is a non-exhaustive list of DoS attack types:
- bandwidth attack
- service request flood
- SYN flooding attack
- ICMP flood attack
- peer-to-peer attack
- permanent DoS attack
- application level flood attack
## See also
- [Denial-of-service attack](https://en.wikipedia.org/wiki/Denial-of-service_attack) on Wikipedia
- [Denial-of-service on OWASP](https://owasp.org/www-community/attacks/Denial_of_Service)
- {{Glossary("Distributed Denial of Service","DDoS")}}