Ethernet Data-Link Protocols
One of the most significant strengths of the Ethernet family of protocols is that these protocols use the same data-link standard. In fact, the core parts of the data-link standard date back to the original Ethernet standards.
The Ethernet data-link protocol defines the Ethernet frame: an Ethernet header at the front, the encapsulated data in the middle, and an Ethernet trailer at the end. Ethernet actually defines a few alternate formats for the header, with the frame format shown in Figure 2-15 being commonly used today.
Figure 2-15 Commonly Used Ethernet Frame Format
All the fields in the frame matter, but some ...
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