Before packets reach routers, they travel as frames across local networks. I will show you how Ethernet became the foundation of nearly all local area networks. You will learn how MAC addresses identify devices, how Ethernet frames carry your data, and how switches make forwarding decisions. Understanding these Layer fundamentals is necessary before you can troubleshoot connectivity issues or design network segments.
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$ curl repovive.com/roadmaps/network-design/physical-and-data-link-fundamentals/intro
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