As described in Chapter 1, the Layer 2-specific PDU is a frame. The Data Link Layer created this new data unit by adding a Layer 2 frame header and trailer before passing it down to the Physical Layer. The most important information inside the frame header is the source and destination MAC addresses.
Layer 2 addresses are also called MAC (Media Access Control) addresses, physical addresses, or burned-in addresses (BIAs). These are assigned to NICs or device interfaces when they are manufactured.
MAC addresses are 48-bit values. The first 24 bits represent the Organizational . . .
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