Can you tell about the principles of computer networks and their main components?

Computer networks are systems that connect devices for data exchange. The main principles of operation:

• Data transmission occurs according to protocols that define the rules of exchange (e.g., TCP/IP).
• Routing — selecting a path for data transfer between nodes.
• Addressing — each device is assigned a unique address (IP address).

Main components of a network:

• Devices (hosts) — computers, servers, smartphones.
• Communication equipment — routers, switches, modems, which ensure data transfer.
• Communication channels — physical or wireless data transmission lines.

For example, when you send an email, the data passes through several routers that direct it to the recipient's server using IP addresses and transmission protocols.