What is a 'network sniffer' used for?

A network sniffer, also known as a packet analyzer or protocol analyzer, is employed to capture and analyze data packets traversing a network. This tool allows technicians and network administrators to monitor the traffic flowing through a network in real-time, providing insights into the data exchange occurring between devices. By capturing these packets, users can examine the information being sent, including the headers and payload, which assists in troubleshooting issues, optimizing performance, and ensuring proper security measures are in place.

This capability is essential for diagnosing network problems, verifying data integrity, detecting unauthorized access, and understanding the overall traffic patterns within a network. The ability to dissect each packet and its contents enables informed decision-making regarding network management and security protocols.

Other options do not align with the primary function of a network sniffer. Encrypting data packets pertains to ensuring data security, monitoring internet speed focuses on bandwidth assessment, and testing network connectivity deals with checking if devices can communicate, none of which constitute the core purpose of a network sniffer.