Dos and DDos attack

            What is DoS and DDoS attack?

  What is DoS attack?        

                                        DoS attack stands for Denial of Service. This is the one of the website attacking methods used by black hat hackers.To perform DoS attack we need only one computer and Internet connection with large bandwidth

(good speed). One of the best HTTP DoS testing tools is Golden eye which a script written in python programming  language. This  tool is only for education purpose not for malicious activities.Don't use this tool for criminal activities.

 Working of DoS attack:

                                        The attacker continuously sending large amount of packets ( fake requests) to the web server within very period without getting any response for that corresponding requests. But the web server trying to response all of the requests and it can't able to understand the valid and invalid packets which are sent by attacker.This process is done until the web server getting down and overloaded.This DoS attack causes temporarily or permanent damage. We can use firewall to prevent this DoS attack.

attacker sending multiple request to server

What is DDoS attack? 

                           DDoS attack stands for Distribute Denial of Service.
To perform DDoS attack we need large number of computers and Internet connection (a group of attackers needed) .This attack is also similar to the DoS attack.The World famous hackers group "Anonymous" performs this type of  attack to shutdown the web servers.If the website doesn't have any vulnerability they will perform DDoS attack to down the server.

Working of DDoS attack: 

                       Before performing DDoS attack attacker have to make bot-net which are connected with controller(server). When the attacker sending target domain(www.xxx.com) and type of attack to the control server. Control server send it to bots which are connected in different network to form bot-net.A group of  bots are called bot-net.And the bots in the bot-net continuously sending flood to the victim or target website until it shutdown.We can perform DDoS attack without bots.We can use attackers in different network instead of bots. 

Whats is Bot-net?

                       Bots are also a type of a malicious software which are installed in the other computer without  the user knowledge.Bot doesn't access your data it is stay silently until command from the attacker through the controller server.when it get command it continuously sending packets (flood) to the target server. A group of Bots are called bot-nets.The bot affected computers are called zombie computers. 

                            
you can see live DDoS attack by click this : Live DDoS attack