What is OSI Model Layers & Protocols? | Explained #ccna

**🌐 OSI Model Explained in Seconds! 🚀**

The **OSI Model** has **7 layers**, each handling specific network functions:

1️⃣ **Physical Layer** – Transfers raw data via cables/wireless (Ethernet, USB).
2️⃣ **Data Link Layer** – Manages MAC addresses & error detection (Switches, ARP).
3️⃣ **Network Layer** – Routes data using IP addresses (Routers, IP, ICMP).
4️⃣ **Transport Layer** – Ensures reliable data delivery (TCP, UDP).
5️⃣ **Session Layer** – Manages sessions & connections (RPC, NetBIOS).
6️⃣ **Presentation Layer** – Translates data formats (SSL, JPEG, HTML).
7️⃣ **Application Layer** – Direct user interaction (HTTP, FTP, SMTP).

💡 **Remember:** Data moves from **Layer 7 to Layer 1** when sending & **Layer 1 to Layer 7** when receiving! 🔁

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