In a SYN flooding denial of service attack, what resource is the attacker trying to exhaust? RAM? CPU?
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                    https://en.wikipedia.org/wiki/SYN_flood You need to know how TCP works to answer this question – Dec 15 '17 at 00:27
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                    Possible duplicate of [What is a DoS Attack and how does it differ from a DDoS attack?](https://security.stackexchange.com/questions/22809/what-is-a-dos-attack-and-how-does-it-differ-from-a-ddos-attack) See also: https://security.stackexchange.com/questions/4667/how-do-dos-ddos-work – Polynomial Dec 15 '17 at 00:51
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                    1Please do at least some research before posting questions. You don't even have to scroll down the [wikipedia article](https://en.wikipedia.org/wiki/SYN_flood) to get an answer. – Marc Dec 15 '17 at 00:52
 
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        Depends...
it could be bandwidth saturation
exhausting of maximum number of supported half-open connection
service, OS or hardware limitation
etc.
        Jan Pol
        
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