TryHackMe | OSI Model | Walkthrough
Channel: PLei
Date: 26/05/2023

Learn about the fundamental networking framework that determines the various stages in which data is handled across a network.

*As always, I recommend to read through every task to get a complete understanding of each room. Happy learning!*

♾️TIMESTAMP ♾️
0:54 Task 1 - What is the OSI Model?
1:52 Task 2 - Layer 7 - Application
2:26 Task 3 - Layer 6 - Presentation
2:55 Task 4 - Layer 5 - Session
3:32 Task 5 - Layer 4 - Transport
5:20 Task 6 - Layer 3 - Network
6:40 Task 7 - Layer 2 - Data Link
7:10 Task 8 - Layer 1 - Physical
7:45 Task 9 - Practical - OSI Game
8:51 Task 10 - Continue Your Learning: Packets & Frames

The OSI (Open Systems Interconnection) model is a conceptual framework that standardizes the functions of a network into seven distinct layers. Each layer has a specific role and interacts with the layers above and below it, facilitating communication between different network devices and ensuring interoperability. Here's a brief summary of the seven layers:

1. Physical Layer: This layer deals with the physical transmission of data, including the electrical, optical, or wireless signals used to transmit bits over a network medium.

2. Data Link Layer: The data link layer provides error-free and reliable point-to-point or point-to-multipoint data transmission between network nodes. It also handles data framing, error detection, and flow control.

3. Network Layer: The network layer focuses on the logical addressing and routing of data packets across multiple networks. It determines the optimal path for data transmission and manages congestion control.

4. Transport Layer: This layer ensures the reliable delivery of data between end systems. It segments data received from the upper layers into smaller units and provides flow control, error recovery, and reassembly at the receiving end.

5. Session Layer: The session layer establishes, manages, and terminates communication sessions between applications. It enables synchronization, checkpointing, and recovery of data exchange processes.

6. Presentation Layer: The presentation layer translates and formats data from the application layer into a compatible format for the network. It handles data encryption, compression, and protocol conversion to ensure proper data representation.

7. Application Layer: The application layer provides a user interface for accessing network services. It enables applications to interact with the network and includes protocols for file transfer, email, remote access, and other high-level services.

By dividing network functionality into these layers, the OSI model allows for standardized communication protocols, easier troubleshooting, and the ability to mix and match different hardware and software components within a network.