Which control-plane protocol is used to map an endpoint to a location in a Cisco SD-Access network?

FabricPath is a Layer 2 multipath routing technology for data centers, not used as the control plane for endpoint-to-location mapping in SD-Access.

IS-IS (Intermediate System-to-Intermediate System) is an interior gateway protocol (IGP) used for routing within an autonomous system, not for endpoint-to-location mapping in SD-Access.

Locator/ID Separation Protocol (LISP) is the control plane protocol in Cisco SD-Access that provides the mapping system between an endpoint's identity (EID) and its current location (RLOC), which is essential for host mobility and overlay networking. This allows endpoints to move within the fabric without changing IP addresses.

MP-BGP (Multiprotocol BGP) is used in SD-Access for underlay routing and for carrying EVPN routes (VXLAN Network Identifiers) but not directly for endpoint-to-location mapping as LISP does.