Lab 5 -- Inter VLAN Routing (Router on a Stick) скачать в хорошем качестве

Lab 5 -- Inter VLAN Routing (Router on a Stick)

In Lab 5, we configure inter-VLAN communication using Router-on-a-Stick (ROAS) and explain why VLANs require a Layer 3 device to communicate across broadcast domains. Up to this point, VLANs and trunking are already in place, but devices in different VLANs cannot communicate because switches operate at Layer 2. In this lab, we solve that limitation by introducing a router and configuring logical subinterfaces on a single physical router interface. What this lab covers: Why VLANs create separate broadcast domains Why inter-VLAN routing requires a Layer 3 device Router-on-a-Stick design explained (single interface, multiple subinterfaces) Creating router subinterfaces using 802.1Q encapsulation Assigning default gateway IP addresses for VLANs 10, 20, 30, and 99 Bringing up the physical router interface to activate subinterfaces Configuring the switch port as a trunk and allowing specific VLANs Setting default gateways on end devices Verifying connectivity with ping tests Troubleshooting common configuration mistakes By the end of the lab, all PCs across multiple VLANs successfully communicate, demonstrating how logical subinterfaces act as gateways and route traffic between VLANs. This lab reinforces real-world networking concepts and highlights the importance of troubleshooting—mistakes are expected, and knowing how to identify and fix them is a critical skill. 👉 Next Lab: Moving beyond the local network with static routing between routers.