Computer networking has come a very long way in the last 20 years since the original government-built Internet was opened up for general commercial use. In those days, there were few Wide Area Networks (WANs) connected to the Internet and the World Wide Web was still in its infancy. Most businesses and organizations had at best, very simple LAN networks, and few of those even connected to anything outside the LAN firewalls, except through indirect telephone modems. As the Internet grew, private WANs grew alongside it, but still only interconnected fairly indirectly.
The IT administrators of both sides hand configured all connections and manually calculated and adjusted for load balancing. As the Internet grew, more and more interoperable connections were made between the public and private networks. New tools, such as Quality of Service (QoS), and remote administration were developed. Today that networking has grown massively complex, especially on the public Internet. To address the need for faster, more dynamic administration of data traffic flow, Software-Defined Wide Area Network (SD WAN) network control software was invented. But, the definition of SD WAN technology is a bit consternating.
It has been said that the irony of software-designed networking is that there are so many different views on just what the term means, that firmly defining what SD WANs are can be difficult. A certain duality does exist in this emerging field of automated network management, with two different SDN models and two SDN missions in cloud computing. Successful operations with highly efficiency is the key goal that Cloud Wan can fulfill. Until this technology matures to where standards can be established, a very fuzzy logic explanation must suffice.
Software-Defined Wide Area Networks (SD WANs) are dynamically self-configuring virtual networks. Just as Virtual Personal Networks have enabled businesses and other organizations to sub-define particular nodes over the Internet as a cohesive private WAN, so SD WANs provide automated virtual cloud components for general use over the Internet. This can not only provide better run-time load balancing and automatic scaling to accommodate network traffic, it will also reduce operation costs and lower overall complexity.
In this age of cloud computing, administrators are overtaxed in attempting to quickly reconfigure, expand and contract networking topographies. These stresses have made clear the necessity of the time and expense required to implement SD WAN networking clouds. No better solutions have been found so far, so all clouds will need to adapt this technology to remain competitive, moving forward.