SD-WAN can be used to accomplish the same task of connecting offices securely. Instead of purchasing private MPLS links from the ISP, administrators can use SD-WAN to create private links by leveraging on-prem firewalls at each branch location to create site-to-site encrypted connections over commodity internet bandwidth. SDWAN relies on having on-prem appliances at each office location so that the private connections between the offices can be established. Because SD-WAN uses inexpensive commodity bandwidth, the cost per megabit is much lower than MPLS.