Why are different levels used in computer networks to organize data transmission?

The use of different levels in computer networks is due to the need to divide the complex task of data transmission into simpler and manageable parts. Each level is responsible for a specific aspect of transmission, which allows:

• Isolating functions and simplifying development and debugging.
• Ensuring standardization and compatibility between different devices and protocols.
• Allowing independent development and improvement of each level without affecting others.

For example, the OSI model divides the transmission process into 7 levels: physical, data link, network, transport, session, presentation, and application. Each level performs its own task, for instance, the physical layer is responsible for transmitting bits over the medium, and the transport layer for reliable data delivery.

This division facilitates understanding, designing, and maintaining network systems.