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Digital Evidence and Computer Crime, 3rd Edition by Eoghan Casey

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Chapter 24

Digital Evidence on Physical and Data-Link Layers

Eoghan Casey

Contents

The physical and data-link layers provide the foundation for everything else on a network. The physical layer is the medium that carries data—such as the cables, radio waves, microwaves, or lasers. The data-link layer joins a computer with the physical layer, and includes the transmission method (e.g., CSMA/CD) as mentioned in Chapter 21. Network Interface Cards (NICs) are part of the data-link layer—connecting computers to the network cables. Each NIC has a unique address (machine access control ...

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