Some of the DDoS attacks are the Ping Flood Attack, ICMP Land Attack, TCP-SYN Attack, ARP Flood Attack and UDP Flood Attack. All of these can cause Denial of service by storming the host with the respective attack traffic. Some of them are used to bring down the host in a Local Area Network where as some can bring down a host in internet that can be a web server or Internet root servers itself [7]. To evaluate the performance of McAfee SecurityCenter’s Personal Firewall against such DDoS attacks, we experimented with so called and commercially promoted, secure computer system, namely Apple’s iMac with Windows XP-SP2 operating system. We also compared the performance of McAfee SecurityCenter when the iMac platform is deploying Windows XP-SP2 with that of a DELL Inspiron 530 desktop built with Vista Business and McAfee SecurityCentre with Personal Firewall and 2 GB of RAM. We consider at-tacks at Layer-2, Layer-3 and Layer-4 in the TCP/IP suite in this paper. The rest of the paper is organized as follows: Section 2 provides the information about ex-perimental setup. In Section 3 we present experiments to evaluate effect of different attacks on the McAfee SecurityCenter. Section 4 is conclusion followed by Section 5 as Acknowledgment and Section 6 as references.