There has been a multiplying growth in the quantity of DDoS assaults year over year. The biggest DDoS assault of Q2 2015 deliberates more than 240 gigabits for each second (Gbps) and endured for over 13 hours. China has remained the top wellspring of non-ridiculed assault activity for past 2 quarters. SYN and Simple Service Discovery Protocol (SSDP) were the most widely recognized DDoS attack vectors this quarter each representing more or less 16% of the DDoS attacks.”]
Source: http://securityaffairs.co/wordpress/39571/cyber-crime/q2-2015-ddos-akamai.html