DDoS Incidents and their Impact: A Review

The phenomenal growth and success of Internet has changed the way traditional essential services such as banking, transportation, medicine, education and defence are operated. Now they are being progressively replaced by cheaper and moreefficient Internet-based applications. In present era, the world is highly dependent on the Internet and it is considered as maininfrastructure of the global information society. Therefore, the availability of Internet is very critical for the socio-economicgrowth of the society. However, the inherent vulnerabilities of the Internet architecture provide opportunities for a lot of attackson its infrastructure and services. Distributed denial-of-service attack is one such kind of attack, which poses an immense threatto the availability of the Internet. One of the biggest challenges before researchers is to find details of these attacks because toavoid defamation most of the commercial sites do not even reveal that they were attacked. In this paper, an overview ofdistributed denial-of-service problem and Inherent vulnerabilities in the Internet architecture are provided. Real distributeddenial-of-service incidents with their financial impact are critically analyzed and finally need for a comprehensive distributeddenial-of-service solution is highlighted