15.7.9 Internetworking In Perspective
This chapter has extended the study of communication systems beyond individual networks to the worldwide interconnection of many independent networks.
Internetworking combines logical addressing, packet forwarding, routing, and transport protocols to create a communication system of unprecedented scale. Together, these technologies allow billions of devices employing many different physical communication media to exchange information seamlessly.
From the user's perspective, sending an email, browsing a website, or streaming a video appears straightforward. Behind the scenes, however, thousands of routers, optical links, wireless systems, satellites, and communication protocols cooperate to deliver information reliably across the globe.
The Internet is therefore not a single network but a carefully coordinated collection of interconnected networks operating according to common architectural principles. Understanding those principles provides the foundation for understanding modern digital communication systems and the technologies that will shape their future.
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