At the present time, it is very vital to maintain a high level security to make certain harmless and reliable communication of information between various institutions. In highly active networks, the occurrence of disruptive or suspected network attacks leads to enormous destruction of data. Denial of service attack detection system aims at observing the attacks on the Internet from normal use of it. It is a crucial part of the network security system. The new guard system is suitable for efficient implementation for the detection and prevention of Denial-of-Service (DoS) attacks.