This white paper examines how TAPs, SPAN ports, RSPAN, and VLAN access control lists affect the accuracy of network data used for monitoring and analysis. It explains that every access method can alter traffic, particularly packet timing, and stresses that analysts must understand these limitations before relying on captured evidence. SPAN-based methods may introduce variable delays, discard malformed frames, and provide incomplete visibility, making precise real-time analysis difficult. A dedicated TAP offers the most complete copy of traffic, including errors, interframe gaps, and packets of unusual sizes. The paper recommends testing access devices before deployment, comparing traffic before and after installation, evaluating filtering and security capabilities, and choosing scalable te

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