🌐OSI Layers & Protocols — The Language of Networking If you want to build a career in Networking, Cybersecurity, Cloud or DevOps, then understanding the OSI Model & its protocols is absolutely essential. The OSI Model explains HOW data travels across a network — step by step: 📶 Layer 1 – Physical: Cables, signals, NICs 🧾 Layer 2 – Data Link: MAC, ARP, VLAN, STP 🌍 Layer 3 – Network: IP, OSPF, ICMP, EIGRP, BGP 📦 Layer 4 – Transport: TCP/UDP, reliability 🔄 Layer 5 – Session: Connection contro