During the last two years, we've seen DDoS attacks taking down high authority websites and networks. Unlike what we used to think that such attacks needs a large scale of resources (botnet or many compromised servers), these attacks are carried out by individuals or small number of people (often teenagers) with limited resources.
more here.........http://www.pythonforpentesting.com/2015/02/ddos-amplification-attacks.html
DDOS AMP TOOL here...............https://github.com/OffensivePython/Saddam
more here.........http://www.pythonforpentesting.com/2015/02/ddos-amplification-attacks.html
DDOS AMP TOOL here...............https://github.com/OffensivePython/Saddam