CARTA is Continuous Adaptive Risk and Trust Assessment. It is not a very well-defined approach, basically saying that access to resources should not be granted based on static allow/deny rules (ACL). Instead, the access rights should change dynamically based on the parameters like location, the security posture of the entity requesting access, etc.
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The mesh is a collection of nodes, a lighthouse, and an admin center. The user device is a node, a server is a node, cloud stack is a node, LAN access box is a node.