📝✏️ Sub Interface Configurations Who says complex networking concepts need fancy software? 👀 This hand-drawn sub-interface configuration proves that sometimes a pencil notebook is all you need to truly understand VLANs, trunking, and router-on-a-stick 🧠💡 📡 From RT1 to SW1, 🖧 VLANs clearly mapped, ✍️ Commands written line-by-line like a study cheat-sheet— this is how real learning sticks. If you’re studying CCNA / networking fundamentals, or teaching concepts in a way that actually makes se