Lec-2: Introduction to Computer Network | OSI MODEL in easiest Way in Hindi | Need of OSI model

Seamless Device Connectivity for Data Sharing A computer network is a collection of computing devices linked to share data effectively. It connects a sender to a receiver using wired or wireless channels to move data packets. The architecture supports homogeneous and heterogeneous devices, enabling smooth data flow. This connectivity lays the groundwork for communication independent of physical distances.

Protocol-Driven Communication for Data Clarity Successful data exchange depends on a common set of instructions that both sender and receiver follow. Protocols ensure that transmitted messages are interpreted correctly, much like a shared language. These guidelines prevent misinterpretations and maintain the integrity of the data. Adhering to standard protocols is essential for coherent communication.

Abstracting Remote Interaction as Local Connectivity Computer networks bridge the gap between physically separated client and server systems so that remote interactions feel like local operations. This abstraction contrasts with inter-process communication within a single machine, creating a seamless experience no matter the distance. It allows services accessed from distant locations to respond as quickly as local data retrieval. This unified environment exemplifies the power of modern distributed connectivity.

Ensuring Reliable Data Transfer with Mandatory Controls Error control verifies that transmitted messages remain unaltered despite potential interference from noise or hacking. Flow control manages data volume to prevent network congestion and buffer overload. Multiplexing and demultiplexing ensure that messages are correctly routed among multiple processes to maintain systematic communication.

Enhancing Security and Continuity with Optional Features Encryption and decryption transform data into secure formats to protect sensitive information, though they add system complexity and processing time. Checkpointing allows large data transfers to resume from the last saved point instead of restarting, ensuring efficient recovery from transmission failures. These optional mechanisms are applied only when their benefits outweigh the additional overhead.

Structuring Communication Through Standardized Protocol Layers The OSI model organizes over 70 networking functionalities into a structured framework across seven layers, from physical to application. This layered approach standardizes data transmission and guarantees a systematic application of error control, flow management, and other core mechanisms. Such a model provides a blueprint for protocols that secure, manage, and efficiently deliver messages across networks.