MFA (Multifactor Authentication) means using multiple factors to authenticate. For example: Factor 1 - name + password and Factor 2 - OTP (one time password) - you can get it from Microsoft Authenticator or Google Authenticator Android app 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.