Which tool is suitable for monitoring real-time server memory usage and I/O operations?

The choice of Vmstat is appropriate for monitoring real-time server memory usage and I/O operations. Vmstat, short for virtual memory statistics, provides a snapshot of various system resources and performance metrics, including memory usage, swap activity, and I/O operations. It offers critical information such as how much memory is being used, how much is free, and how the system is handling input/output operations. This makes it an essential tool for system administrators and engineers who need to analyze the performance of their servers in real-time and address potential bottlenecks or resource allocation issues.

Other tools mentioned are designed for different functions and do not focus on monitoring memory and I/O operations. Tcpdump is a packet analyzer used for network traffic capture and analysis, while Netcat is primarily a networking utility for reading from and writing to network connections. Ssdeep is a tool for computing and matching context-triggered piecewise hashes, typically used in digital forensics and malware detection, rather than for system performance monitoring.