CSKH-02.2017- (Abstract) In recent research, DoS and DDoS attack is a crucial topic where solutions have not been satisfied with the real problem. As a consequence of the fact that the former one mainly focuses on the vulnerabilities of protocols to conduct an invasion, while the latter one utilizes multiple compromised systems for a single target to make the services unavailable for legitimate users. In this paper, we will concentrate on making clear the impact of these attacks on RAM utilization, CPU usage, and network throughput of various Web Servers and Application Servers, which contributes to understanding deeply and constructing effective DoS, DDoS defense systems.