CompTIA Linux+ Certification 2026 – 400 Free Practice Questions to Pass the Exam

To list the processes running on the system along with their network usage, the command that best fits this requirement is `lsof`. This command stands for "list open files," and in Unix-like operating systems, it is capable of displaying information about files opened by processes. Files in this context include network sockets, making `lsof` especially useful for monitoring network usage.

When you run `lsof`, you can specify options to filter the output to show only network-related files or connections, allowing you to see which processes are using network resources, the associated ports, and the state of those connections. This makes it a powerful tool for diagnosing network issues or monitoring network activity on a system.

The other commands mentioned do not specifically focus on network usage in the same way. For example, `top` and `htop` are great for providing a dynamic, real-time view of system processes and their resource usage, but they do not directly show detailed network connection information. The `ps` command displays a snapshot of current processes but lacks the capability to indicate active network usage or associated open files. Thus, when the goal is to ascertain which processes are using network resources, `lsof` is the appropriate choice.