1. The cert website, 2015, http://www.cert.org/.
2. Recent DDoS attacks, 2016, https://www.ddosattacks.net/twitter-amazon-other-top-websites-shut-in-cyber-attack/.
3. The arbor network’s WISR report, 2015, http://www.arbornetworks.com/images/documents/WISR2016_EN_Web.pdf.
4. Survey of network-based defense mechanisms countering the DoS and DDos problems;Peng;ACM Comput. Surv. (CSUR),2007
5. E-Ldat: a lightweight system for DDos flooding attack detection and IP traceback using extended entropy metric;Bhuyan;Security Commun. Netw.,2016