The Secrets of New TCP/IP Model! | 2025 Free CCNA Lessons

Free CCNA Lesson 4 | TCP/IP Model In this lesson, we will focus on What is TCP/IP Model? What are the layers of TCP/IP Model? Why We Use TCP/IP Model? What are the functions of TCP/IP Model? And the difference of 4 layered old TCP/IP Model and 5 layered TCP/IP Model. . OSI is the abbreviation of Open Systems Interconnection. OSI Referance Model is the standard model of how devices communicate each other over a network. Beginning with Physical Layer (Layer 1), it goes throught the Application Layer (Layer 7). Each OSI layer has specific role in computer network communication. . OSI Layers: - Application Layer (5) - Transport Layer - Network Layer - Data-Link Layer - Physical Layer . OSI Model: https://ipcisco.com/lesson/osi-referance-model/ TCP/IP Model: https://ipcisco.com/lesson/tcp-ip-model/ . 2025 CCNA 200-301 v1.1 . Network Device: https://ipcisco.com/lesson/network-devices-2/ . You can also benefit from the below pages for CCNA, CCNP and CCIE! CCNA Courses and Useful Resources...