What is the principle of DDOS attacks?


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A topic long overdue.
As we all know, DDOS attacks are made by server overload victim. But let's say, for web pages, need one kind of attack, for (for example) server of cs, another kind and so on.
The question itself: what is needed, what the attack, and how to implement it from the point of view of code(at least in the abstract, explain)?

Don't think, need exclusively educational purposes, as with all articles of the criminal code introduced
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DDOS can happen (and easiest implemented) stupid saivam channel. It is also possible to generate such requests, which require much more processing resources than on the actual creation of the query: full-text search, for example.
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Principle - a lot.
Many customers beaten to death a single server.
Lot is preferably tens of thousands of customers though.

Types - there is a view of a resource load. Of course they all have to beat together this resource.

For example:
Loading static files - it is useless (unless it's "attack on money in the cloud service" ;)
It is advisable to ask the server what resource-intensive, for example, requires recourse to the DBMS.
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