DDoS attack extensively existed have been mortal threats for the software-defined networking (SDN) controllers and there is no any security mechanism which can prevent them yet. Combining SDN and network function virtualization (NFV). a novel preventing mechanism against DDoS attacks on SDN controller called upfront detection middlebox (UDM) was proposed. The upfront detection middleb... https://www.markbroyard.com/best-save-happy-way-ashy-bines-whey-protein-powder-choc-caramel-500g-online-sale-big-deal/