The traditional WAN (wide-area-network) functions are to connect users at remote/branch or corporate to applications hosted in Data Center servers. Usually, dedicated circuits are required to make the connection reliable and secure MPLS circuits are commonly used to achieve this.
But time has changed. Business models are changed and it needs a new network model. This is where the SD-WAN addressed those changes.
Benefits of SD-WAN:
Due to the rise of software as a Service (SaaS), public Infrastructure as a Service (IaaS) and other cloud services, the traffic patterns are changing and creates new requirements from business in relation to performance, security, management and cloud connectivity.
CISCO SD-WAN is a cloud-based WAN Solutions catered for enterprise and data center networks. This helps to address the traditional WAN limitations and the new WAN requirements.