You cannot use the first address (Network ID) or the last address (Broadcast Address) in any range for a specific host. Levels 4–6: Introducing Routers Now you have a router connecting multiple subnets.
This tutorial breaks down the essential concepts and provides a roadmap for the common hurdles you'll face. Core Concepts: The Toolbox netpractice 42 tutorial
The mask (e.g., 255.255.255.0 or /24 ) defines which part of the IP is the "street" (Network ID) and which is the "house" (Host ID). You cannot use the first address (Network ID)
The goal here is simple: make sure devices are on the same network. netpractice 42 tutorial