[Unity Multiplayer Networking] About NPCs/AIs logic (movement, interaction,..) in multiplayer networking

Unity is having a Networking solution (Unity MLAPI).. so I wanted to check it out, but I'm still new to networking. My question is: - If I want to have an AI or a NPC in my multiplayer game which it can walk around and interactable. How do I impliment logic on it ? Like do you do the movement on the Server side and it gets called on all Clients ? Or you just called it on each Client and doen't need to go through the Server ?