🌐OSI (Open Systems Interconnection) model 🌐

🌐OSI (Open Systems Interconnection) model 🌐

1. Physical Layer 🛠️ - The Foundation

Purpose: Transmits raw bits over a physical medium.

Example: Ethernet cables, fiber optics, or even Wi-Fi signals.

Real-Time Use: When you connect to Wi-Fi, your device's hardware (like a network card) operates at this layer.

2. Data Link Layer 🔗 - Forming Links

Purpose: Transfers data between adjacent network nodes in a wide area network or between nodes on the same local area network segment.

Example: Switches and MAC addresses.

Real-Time Use: When your computer communicates over Ethernet, it uses MAC addresses to ensure data reaches the right device on your LAN.

3. Network Layer 🌍 - Routing Data

Purpose: Determines how data is sent to the receiving device.

Example: Internet Protocol (IP) and routers.

Real-Time Use: When you send an email, the network layer routes your message across the internet using IP addresses.

4. Transport Layer 🚚 - End-to-End Communication

Purpose: Ensures complete data transfer.

Example: Transmission Control Protocol (TCP) and User Datagram Protocol (UDP).

Real-Time Use: When you stream a video, the transport layer manages the data packets to ensure smooth playback.

5. Session Layer 🤝 - Managing Sessions

Purpose: Controls the connections between computers.

Example: Session initiation in web applications.

Real-Time Use: Logging into a web service, the session layer keeps your connection stable and secure.

6. Presentation Layer 🎨 - Data Translation

Purpose: Translates data from the application layer into a format the network can understand, and vice versa.

Example: Secure Sockets Layer (SSL) encryption.

Real-Time Use: When you visit a website, the presentation layer encrypts the data so it can be securely transmitted over the internet.

7. Application Layer 📲 - Closest to End-User

Purpose: Provides networking services to the end-user.

Example: HTTP for web browsing, FTP for file transfers.

Real-Time Use: Opening a browser and searching on Google involves the application layer to send your request to the web server.

🌐 The OSI model is a conceptual framework that standardizes the functions of a telecommunication or computing system without regard to its underlying internal structure and technology. Its goal is the interoperability of diverse communication systems with standard protocols.

#OSIModelLayers

#NetworkCommunication

#PhysicalLayerTech

#DataLinkProtocols

#NetworkRouting

#TransportLayerTCP

#SessionLayerSecurity

#PresentationLayerData

#ApplicationLayerProtocols

#NetworkingStandards