Router-on-a-Stick Explained | Sub-interfaces, 802.1Q Tagging & Default Gateways | CCNA in English

Welcome back to our CCNA Switching series! In this video, we master Router-on-a-Stick, a vital technique for Inter-VLAN routing. Normally, different VLANs cannot communicate with each other. Router-on-a-Stick solves this by using a single physical router interface to enable routing between multiple VLANs. We will walk through the entire concept, how 802.1Q tagging works, and the step-by-step Cisco IOS commands required to get your network up and running. 📌 What You Will Learn in This Video:The ROAS Concept: How to use a single physical link configured as a trunk between a switch and a router. Sub-interfaces: How to divide a physical router interface into multiple sub-interfaces, with each representing a specific VLAN and acting as its default gateway. 802.1Q Tagging: How switches and routers use the 802.1Q tag (VLAN ID) to forward frames to the correct sub-interface. Switch Configuration: The exact commands to configure access ports for end devices and a trunk port for the router link. Router Configuration: Step-by-step instructions for assigning encapsulation dot1Q and IP addresses to sub-interfaces (like g0/0.10, g0/0.20, and g0/0.30). Hit the Like button if you found this explanation helpful, and Subscribe for more CCNA tutorials! Let me know in the comments if you have any questions about configuring sub-interfaces.Hashtags#CCNA #RouterOnAStick #InterVLANRouting #CiscoNetworking #NetworkEngineer #8021Q #SubInterfaces #CCNA200301 #NetworkingTutorial