What is a "denial of service attack"?
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M$5 Answers
In a DoS attack, a computer (usually a web server) is flooded with so many connections that it cannot respond to legitimate requests.
Distributed Denial of Service (DDoS) attacks are similar, but rather than coming from a single location, requests are sent out from a variety of different locations. This makes the attack harder to stop.
Commonly, "botnets" are formed from millions of unsuspecting, virus infected personal computers and servers. Once activated, the combined power of the botnet is substantial and if properly activated can cause network administrators a little bit of trouble.
Sometimes, a website becomes so popular that without meaning to be an attack it floods a website with traffic causing it to stop working. This is commonly refereed to as the "Slashdot effect" or the "Digg effect".
The solution to DoS and DDoS attacks is redundancy, traffic shaping, and connection identification and routing.
Here is a pretty good video:
http://videos.silicon.com/60416850.htm
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M$
You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
M$
It can be disturbed also ..Where 'n' number of computers work synchronously and attack a particular service..Hacker can use any one system to launch a attack if backdoors exists then victim computer is said to be a "zombie".
There many legal tools available to do DOS for "penetration testing" of a site..
Example of one such attack:
http://www.blogpirate.org/2009/05/10/pirate-bay-founder-crafts-distributed-denial-of-dollars-attack/
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Readmore here http://en.wiktionary.org/wiki/denial-of-service_attack
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