MITM means Man In The Middle. It is someone reading or modifying your data on its way between you and your counterpart. Imagine, for example, that you sit in your favourite cafe and connect to the free Wi-Fi. What can happen? The hacker can either break into a poorly protected router in the cafe or advertise another free Wi-Fi in that area with a similar name. Boom! The site you're browsing may look and behave precisely like the original, but it is modified and served from the hacker's computer instead. It sends a password to the attacker first. Then the attacker forwards it to the bank, email server, 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.