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You are here: Home / CompTIA / Network+ / Section I: Networking Concepts / Chapter 2: Matching Network Components with OSI Layers / Layer 2 Network Components

Layer 2 Network Components

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.

 
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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