Which SD-Access feature forwards ARP, broadcast, and link-local frames across the fabric so silent hosts can receive traffic and begin communicating?

Layer 2 Flooding in SD-Access ensures that ARP requests, broadcast traffic, and link-local frames (like NDP) are forwarded across the fabric to reach silent hosts. This is crucial for devices that haven't yet communicated and therefore aren't known to the fabric control plane. Without Layer 2 Flooding, these hosts wouldn't receive initial discovery traffic, preventing them from establishing connectivity. Multisite Fabric is a solution for interconnecting multiple SD-Access domains. Native Fabric Multicast is for efficient multicast routing within the fabric. SDA Transit refers to connecting an SD-Access fabric to an external network.