Internet connected systems are still vulnerable to DoS/DDos attacks despite active security efforts is because of the following reasons:<ref>[http://www.cert.org/homeusers/ddos.html Trends in Denial Service Attack Technology]</ref>
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Internet connected systems are still vulnerable to DoS attacks despite active security efforts is because of the following reasons:<ref>[http://www.cert.org/homeusers/ddos.html Trends in Denial Service Attack Technology]</ref>
* Internet is composed of limited and consumable resources
* Internet is composed of limited and consumable resources