# TCP authentication and  SYN cookie?

**URL:** <https://community.a10networks.com/t/tcp-authentication-and-syn-cookie/566>\
**Category:** TPS - DDoS Protection\
**Created:** [October 17, 2019, 11:52pm UTC](https://community.a10networks.com/t/tcp-authentication-and-syn-cookie/566 "2019-10-17T23:52:59Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![a10\_tm](https://avatars.discourse-cdn.com/v4/letter/a/73ab20/32.png) [@a10\_tm](https://community.a10networks.com/u/a10_tm)\
**Post date:** [October 17, 2019, 11:52pm UTC](https://community.a10networks.com/t/tcp-authentication-and-syn-cookie/566/1 "2019-10-17T23:52:59Z")

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Hi,  
Can anyone explain what is the SYN cookie and how we can use?  
Thanks,

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**Author:** ![tmitsuhata](https://avatars.discourse-cdn.com/v4/letter/t/3bc359/32.png) [@tmitsuhata](https://community.a10networks.com/u/tmitsuhata)\
**Post date:** [October 18, 2019, 12:05am UTC](https://community.a10networks.com/t/tcp-authentication-and-syn-cookie/566/2 "2019-10-18T00:05:14Z")

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Hi,  
Please check this out.

[What are SYN Cookies and How are they Used? | A10 Networks](https://www.a10networks.com/blog/what-are-syn-cookies-and-how-are-they-used/)  
A10 Networks has produced a series of LightTalk videos in which company solutions architects explain a technical concept such as containers, SYN cookies and hybrid DDoS clouds. In this video, Solutions Architect, Syed Danial Zaidi, describes what SYN cookies are and how they help DDoS defense solutions and load balancers protect against SYN flood attacks. A SYN cookie is one method of TCP authentication. Zaidi explains the process by which they help protect against attacks. Thanks.