Consistent Behavior over All Links Using the Ethernet Data Link Layer
Although Ethernet includes many physical layer standards, Ethernet acts like a single LAN technology because it uses the same data link layer standard over all types of Ethernet physical links. That standard defines a common Ethernet header and trailer. (As a reminder, the header and trailer are bytes of overhead data that Ethernet uses to do its job of sending data over a LAN.) No matter whether the data flows over a UTP cable, or any kind of fiber cable, and no matter the speed, the data link header and trailer use the same format.
While the physical layer standards focus on sending bits over a cable, the Ethernet data link protocols focus on sending an Ethernet frame from ...
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