OSI and TCP IP Models - Best Explanation

About this video

• Video Title: OSI and TCP IP Models - Best Explanation
• Channel: Drunk Engineer
• Speakers: [Not explicitly mentioned in the transcript]
• Duration: 00:19:20

Overview

This video explains the OSI and TCP/IP models as reference frameworks for understanding network communication. It details the process of data encapsulation and decapsulation as data travels down and up the protocol stack, and discusses the different layers and their roles in data transmission, from the application layer down to the physical layer. The speaker also highlights the differences and similarities between the OSI and TCP/IP models.

Key takeaways

• OSI Model as a Reference: The OSI model serves as a guideline to delegate responsibilities and understand the communication process, encompassing both directions of data flow.
• Encapsulation and Decapsulation: Encapsulation is the process of adding headers as data moves down the network stack, while decapsulation is the reverse process as data moves up.
• Layered Functionality: Each layer in the network model has specific responsibilities, such as producing data (application layer), identifying applications/services (transport layer), routing (network layer), and handling physical transmission (physical layer).
• Protocol Data Units (PDUs): Different layers refer to data segments with specific terms like "data," "segment," "packet," and "frame," each with associated headers that contain crucial addressing and control information.
• TCP/IP Model vs. OSI Model: The TCP/IP model is a more practical, condensed version that groups OSI layers, with its network layer being equivalent to the OSI network layer, and its network access layer encompassing the OSI data link and physical layers.