The OSI Model - Open Systems Interconnection (OSI) Model

The OSI Model - Demystified!🚀 The OSI (Open Systems Interconnection) model simplifies how devices and protocols collaborate to transmit data across the globe. Let's explore its 7 layers, along with the devices and protocols involved: Physical Layer, Data Link Layer, Network Layer, Transport Layer, Session Layer, Presentation Layer, and Application Layer. 1️⃣ Physical Layer 🛠️ Where raw binary data travels over physical media. ➡️ Devices: Hubs, Modems, Ethernet cables ➡️ Protocols: USB,Bluetooth, Ethernet 2️⃣ Data Link Layer 🔗 Ensures node-to-node communication with error detection and MAC addressing. ➡️ Devices: Switches, NICS ➡️ Protocols: ARP, PPP, IEEE 802.11 (Wi-Fi) 3️⃣ Network Layer 🌍 Routes data between networks, managing IP addressing. ➡️ Devices: Routers, Layer 3 switches ➡️ Protocols: IPv4/IPv6, ICMP, OSPF 4️⃣ Transport Layer 📥 Handles reliable data delivery through segmentation and flow control. ➡️ Devices: Firewalls ➡️ Protocols: TCP, UDP 5️⃣ Session Layer ✅ Manages connections between applications. ➡️ Devices: Application Gateways ➡️ Protocols: NetBIOS, PPTP 6️⃣ Presentation Layer 🌄 Formats, encrypts, and compresses data for applications. ➡️ Devices: Encryption devices ➡️ Protocols: SSL/TLS, JPEG, ASCII 7️⃣ Application Layer 📱 Provides user-facing interfaces and services. ➡️ Devices: Computers, Mobile Phones ➡️ Protocols: HTTP/HTTPS, FTP, SMTP, DNS