 end game or goal target Large Computing Capacity: It refers to attack on computer power and network bandwidth resources. Simultaneous Multi-Threaded OSI Layer Attacks: This focusses attacks on layer 3-7 of OSI model Persistence Over Extended Periods: It include well managed attacks over range of targets. What do the attacker wants through DDoS attack? The question was very obvious as what will be the motive of the attacker while attacking on the network. The motive could be to bring down a specific webpage or website in order to keep it isolated from the business. Thus, causing harm to the company by losing all the online transactions of the company which ends up in failing all the transactions. The reason for such can be cited as business rivalries as one of the main reason (Mirkovic, Reiher 2004). There can be another reason to show grievance to the government by attacking the government websites and bring it down. There can be more reasons for this attack but main reason is to harm the company working in order to cause it harm. There are also the cases when any beginner could perform this attack effortlessly without having much technical expertise. Many attackers often put their tools and scripts online just to aid others who like to carry out similar operations. There are many other websites and forum which often provide tools and instructions manual to carry out such attacks. People who done attack to breach the security unknowingly are termed as "Script Kiddies". CASE STUDY There are numerous types of attacks within the system that emerges day by day. One of the most happening attack held on 7 feb 2000 on the yahoo servers when they got crashed which causes unavailability of yahoo site for several hours leading to great loss to yahoo. There are others attacks to the companies like Buy.com, E-Bay and CNN to the very next day which causes a huge loss to the transaction of these companies where E-bay was a online bank which incurred a huge loss due to this attack. Other companies which suffers from these loss