**💡 MASTER NETWORKING, PART 4: MAC, ARP, and ICMP Explained** Dive deep into the Data Link and Network Layers of the OSI Model with this essential breakdown! Understanding these core protocols is non-negotiable for any aspiring Network Engineer or IT professional. We cover: * **MAC Addresses:** The 48-bit address used by switches for local traffic. * **ARP:** How devices dynamically find the physical address (MAC) from an IP address. * **ICMP (Ping):** How this protocol is used for error report