Join the Discord Server! --------------------- MY FULL CCNA COURSE 📹 CCNA - FREE CCNA FLASHCARDS 🃏 CCNA Flashcards - HOW TO PASS THE CCNA 📚 Get a great book - 📹 Take a video course - ✔ Use practice exams - SOCIAL 🐦 Twitter - 📸 Instagram - 👔 LinkedIn - 💬 Discord - Disclaimer: These are affiliate links. If you purchase using these links, I'll receive a small commission at no extra charge to you. --------------------------------------------------------------------------------------------------------------- What is the TCP/IP model? It's a model to standardise computer networking. The OSI model, while widely referenced isn't used in the real world. The TCP/IP model, however, is the real deal. Thankfully, it's not all that different. Here is the original TCP/IP model. Application, Transport, Internet, and Link. Just like the OSI model, it's numbered from the bottom up but the direction depends if you're sending or receiving traffic. So this is the original TCP/IP model, but, it has been updated. The link-layer has been split into Data Link and Physical and the Internet Layer has been renamed the Network layer. Layer 5: Application protocols such as HTTP, FTP, and SMTP Layer 4: The two most common transport protocols are TCP and UDP. Port numbers are also added here. Layer 3: At the Network layer, we have the Internet Protocol or IP. Routers also commonly operate at this layer Layer 2: The data link layer contains Ethernet related protocols. Switches usually operate at this layer. Although you can get layer 3 switches that have routing capabilities Layer 1: Think of everything you can touch and feel here. Things like cables, hubs and Network interface cards. #ccna #cisco #networking