Definition
Packet sniffing, also known as network sniffing or packet analysis, is the process of intercepting and logging network traffic that passes over a digital network or part of a network. A packet sniffer, or network analyzer, captures data packets as they travel across the network, allowing for detailed examination of their contents. This technique is crucial for network administrators and security professionals to monitor network performance, troubleshoot connectivity issues, and detect malicious activity. For instance, a security analyst might use packet sniffing to identify unusual data flows indicative of malware attempting to exfiltrate sensitive information. Unlike intrusion detection systems that focus on alerting to threats, packet sniffing provides raw data for deeper forensic analysis. This topic is frequently covered in cybersecurity certifications like CompTIA Security+, CySA+, and CISSP.