What is the primary focus of network forensics?

The primary focus of network forensics is to investigate network traffic and communications. This area of digital forensics involves capturing, recording, and analyzing network packets to uncover malicious activities, unauthorized access, or other security incidents that may have occurred over a network. By examining the flow of data through a network, forensic analysts can trace the origins of an attack, determine how it was executed, and identify the entities involved. This process is crucial for understanding security breaches and developing strategies to prevent future incidents.

In the context of the other options provided, analyzing on-site security measures typically relates more to physical security or systems integrity rather than the examination of network traffic. Managing server and database security focuses on the protection of data stored on servers, and monitoring social media activity pertains to the surveillance of social platforms, which does not overlap with the technical analysis of network data traffic. Therefore, B stands out as the most accurate choice regarding the specific domain of network forensics.