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by tenebrisalietum
981 days ago
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MAC is just one way to identify ("address") directly connected/visible nodes on a network. Not all L2 technologies use MAC addresses. - "Directly connected/visibile" means node X can contact node Y simply by throwing something on the medium (wire, radio, etc.) and doesn't have to knowingly send to a middleman (router). When Ethernet was invented in the early 80's there were a lot more L2 technologies. Most are uncommon now (Frame Link DLCIs I think fall in this category, and PPP/dialup was common at one time - no MACs there) except for one: I don't think the cellular network uses MAC addresses at all. I could be wrong with newer 4G/5G stuff which overlaps with Wi-Fi in various places. |
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