Netpractice 42 Tutorial May 2026

For a host to reach another network, its routing table must list the router’s local interface as the Next Hop . Levels 7–10: Advanced Routing & Public vs. Private IPs

Check the Subnet Mask . If it’s /24 , the first three octets of all devices must be identical.

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. netpractice 42 tutorial

Every device needs a unique address. It consists of four octets (e.g., 192.168.1.1 ). Think of it as a house address.

A router interface must have an IP address that belongs to the subnet it is connected to. For a host to reach another network, its

These are the "maps" inside a device or router that tell it which direction to send data for specific destinations. Level-by-Level Strategy Levels 1–3: The Basics of Local Communication

Before diving into the levels, you must master these four pillars: If it’s /24 , the first three octets

Routers connect different networks. If a device wants to send data outside its own "street," it must send it to the Default Gateway (the router’s IP).

This tutorial breaks down the essential concepts and provides a roadmap for the common hurdles you'll face. Core Concepts: The Toolbox