What is DoS and DDoS attack?

"DoS is a brief for Denial Of Services, is an attack used to crash or slow down a server or default gateway to down entire network on its feet. In DoS attack server keeps very busy by sending it multiple requests, so that it deny all the services providing by it for its users. DDoS is Distributed form of DoS attack, so called DDos. "

DoS is an acronym of Denial Of Services. It is an attack used to break down a server or a network. When this attack assaults on a server, it keeps the server busy by sending request continuously and simultaneously from a single or multiple point, on each request the server respond to the requesting client which keeps the server very busy and then the server entirely deny to use any service in the network. So entire network breaks down because of this attack and the consequences might be server crash. All in all server does deny all the services in the network.

The first DoS attack is used and created by a 15 years old boy named mafia boy. He used this attack by distributing this attack via Internet on the American's computers and make them zombie computers and finally targeted Amazon and ebay websites. Which leads these website server down and due to this attack no body was able to open Amazon and ebay for almost 10 days. The consequences leads these companies to the billion dollars loss. This attack was called DDoS attack means Distributed Denial Of Services attack. When you apply this attack from a single system then its called DoS attack and when you apply this attack from multiple computers then it is called DDoS attack.
For an instance I am going to show you an example of Dos attack but don't use it to crash any server. This instance is just giving for study purpose. Use it on your own risk.
Open command prompt and then type ping [IP address of the server] -t -l [times]
In the above example put the IP address of the server instead and put the no. of iteration means how many times you want to send the request to the targeted server.
e,g. ping 10.30.58.12 -t -l 1000 is a kind of DoS attack.
One more important thing to you that almost every company now has the solution to prevent or safe itself from a DoS and DDoS attack. So please don't waste your precious time by applying this attack on Facebook, Google, Amazon, Ebay and so forth.

So we have learned now, What is DoS and DDoS attack? and what are the consequences of DoS and DDoS attack, so keep learning from computerflicks. Please leave comments.