Which two methods interconnect two SD-Access fabric sites?

SD-Access fabric sites can be interconnected using two primary methods. SD-Access transit involves extending the SD-Access control plane and data plane across a transit network, allowing for seamless communication and policy enforcement between sites. This method leverages VXLAN tunnels and LISP for encapsulation and routing. IP-based transit, also known as an external transit, utilizes standard IP routing to connect the fabric sites. In this scenario, the fabric edge nodes or border nodes at each site exchange routes over the IP network, and traffic is forwarded based on traditional IP routing principles. This method is simpler to implement but may not offer the same level of integrated policy enforcement as SD-Access transit. Fabric interconnect, wireless transit, and SAN transit are not standard methods for interconnecting SD-Access fabric sites.