Kya hota osi model ke layers nhi hote..? Hindi explanation #osimodel #networking #ccna #jetking

1️⃣ Physical Layer
Function:
It deals with actual hardware transmission of raw data (bits 0s and 1s).
It defines cables, connectors, voltage, and data rates.
Examples:
Ethernet cables, Hubs, Repeaters, Wi-Fi signals.
Main Work:
Converts data into electrical, light, or radio signals.
Transfers bits physically.
🌐 2️⃣ Data Link Layer
Function:
Provides error detection and correction for data from the physical layer.
It ensures that frames are sent correctly between two directly connected devices.
Examples:
Switches, Bridges, Ethernet (MAC address).
Main Work:
Uses MAC Address to identify devices.
Divides data into Frames.
Detects and corrects transmission errors.
🧭 3️⃣ Network Layer
Function:
Handles routing of data from one network to another (decides the best path).
Examples:
Routers, IP (Internet Protocol).
Main Work:
Uses IP Address for logical addressing.
Routes packets to destination.
Divides data into Packets.
🚚 4️⃣ Transport Layer
Function:
Ensures end-to-end communication between devices.
Responsible for data reliability, sequencing, and flow control.
Examples:
TCP, UDP.
Main Work:
Breaks data into Segments.
Ensures data is received correctly and in order.
Handles retransmission if errors occur.
💬 5️⃣ Session Layer
Function:
Manages sessions (connections) between computers.
It creates, maintains, and terminates communication sessions.
Examples:
Session management in video calls, login sessions.
Main Work:
Starts and ends sessions.
Keeps track of dialogue between devices.
Syncs checkpoints in data transfer.
🧠 6️⃣ Presentation Layer
Function:
Translates data into a format understandable by the application layer.
Handles encryption, compression, and translation.
Examples:
SSL/TLS, JPEG, MPEG, GIF, ASCII, Encryption.
Main Work:
Converts data formats.
Encrypts and decrypts data.
Compresses files for faster transfer.
🖥️ 7️⃣ Application Layer
Function:
Provides user interface and services directly used by applications.
Examples:
HTTP (Web), FTP (File Transfer), SMTP (Email), DNS.
Main Work:
Allows user interaction with network.
Provides network services like email, file sharing, browsing.
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