✍️ OSI Model — Layers Explanation ✅ OSI Model क्या है OSI (Open Systems Interconnection) model networking communication को 7 layers में divide करता है ताकि data transmission व्यवस्थित तरीके से हो सके। --- 🔵 1️⃣ Physical Layer (Layer 1) ✔ Function Data को bits (0,1) में transmit करना Electrical signals / cables / hardware ✔ Examples Cable, Hub, Repeater 👉 यह hardware layer है। --- 🔵 2️⃣ Data Link Layer (Layer 2) ✔ Function Error detection Framing MAC addressing ✔ Examples S