Within past years, SDN has been becoming emerging buzzword in Internetworking Technology, for those who haven’t heard SDN terminology, it offers optimization and flexibility in Networks, i mean, IP Networks.
In a nutshell, SDN might be defined is a “cloud” of Internetworks, because it offers elastic cloud architectures and dynamic resource allocation while decoupling between data plane access and control plane access unlike most Layer 3 Devices in Networking now.
Openflow is example of SDN implementation and it defining some of SDN standards, and it is open. While major vendor offer proprietary implementation for these architectures.
Pradeep Sindhu (Juniper Networks Founder) explained in concise yet understandable what is CDN and it’s relevancies