A Study of Distributed Denial of service Flooding Attacks by Preventive & Defense mechanisms

摘要

Distributed denial-of-service attack, or DDoS attack, is an attempt to overwhelm a website or online service with traffic from multiple sources in order to render it unavailable to users. DDoS attacks are one of the biggest concerns for security professionals. DDoS flooding attacks attempts to disrupt legitimate users access to services. Attackers usually gain access to a large number of computers by exploiting their vulnerabilities to set up attack armies (i.e., Botnets). This paper is about the overview of the DDOS attack, the various types of these attacks, the Preventive measures and the Defense mechanisms for these attacks. The Preventive measure is about the general mechanisms to be done to prevent the entry of DDos attack. The Defense mechanism defines the techniques to protect the network and server.