What is PCAP data and how is it used in network forensics?

• A. Public key certificates
• B. Packet capture data containing network traffic; analyzed to identify protocols, sessions, and indicators of compromise
• C. Password storage
• D. Personal configuration profile

Answer: (B)

PCAP data is packet capture data that records the raw bytes of every network packet seen on a capture interface during a time window. In network forensics, this lets you see exactly how hosts communicated—what protocols were used, the sequence of packets, which IPs and ports talked, and when the traffic occurred. By analyzing a PCAP with a tool like Wireshark, you can filter to relevant conversations, reconstruct TCP streams to view complete dialogues, and spot indicators of compromise such as unusual destinations, beaconing patterns, or large data transfers. PCAPs also help establish a timeline by aligning packet timestamps with system logs or alerts, and they allow you to reproduce or validate events in a controlled setting. Keep in mind that PCAPs can be large and may contain encrypted payloads, so interpretation often relies on metadata, protocol behavior, and cross-checking with other evidence. Other items like public key certificates, password storage, or personal configuration profiles serve different purposes (authentication, credential protection, device setup) and are not raw network traffic captures.