OSI (Open Systems Interconnection) model

The OSI (Open Systems Interconnection) model is foundational for understanding how data moves across networks.

Here’s a quick breakdown of the 7 OSI Layers and example protocols at each level:
1️⃣ Physical – Coax, Fiber, Wireless
2️⃣ Data Link – Ethernet, SLIP, PPP, FDDI
3️⃣ Network – IP, IPsec, ICMP, IGMP
4️⃣ Transport – TCP, UDP, ECN, SCTP, DCCP
5️⃣ Session – APIs, Sockets
6️⃣ Presentation – SSL, FTP, IMAP, SSH
7️⃣ Application – HTTP, FTP, SSH, DNS, IRC
🔍 From physical cables to web browsers, each layer plays a critical role in seamless data communication.

💬 Whether you’re studying networking or working in cybersecurity, knowing this model can elevate your understanding of how the internet really works.
⚙️ How well do you know the OSI Model? Comment with the layer you use most in your work!