A tool used to monitor and analyze network traffic.
Description
A network sniffer, also known as a packet sniffer or network analyzer, is a software or hardware tool that captures and inspects data packets traveling over a network. In the cybersecurity field, network sniffers are crucial for diagnosing network issues, monitoring performance, and identifying unauthorized access or malicious activities. By intercepting and logging packets, these tools allow cybersecurity professionals to analyze the contents of the data being transmitted, which can include sensitive information like passwords and personal data. Network sniffers can operate in various modes, including promiscuous mode, where they capture all traffic on a network segment, regardless of the destination. This capability makes them invaluable for network troubleshooting and security assessments. However, they can also be misused by cybercriminals to gather sensitive information from unprotected networks. Therefore, understanding how to use and secure network sniffers is essential for maintaining a robust cybersecurity posture.
Examples
- Wireshark: A popular open-source network protocol analyzer used by professionals to capture and inspect network traffic.
- tcpdump: A command-line packet analyzer that allows users to capture and display packets being transmitted or received over a network.
Additional Information
- Network sniffers can help identify security vulnerabilities by revealing unencrypted data transmitted over the network.
- Regulatory compliance often requires organizations to monitor network traffic, making network sniffers a key tool in demonstrating adherence to standards such as GDPR and HIPAA.