The MeasureUp XK0-004: CompTIA Linux+ Practice Test prepares candidates for the CompTIA Linux+ XK0-004 exam. The CompTIA Linux+ certification is intended for IT professionals who want to test their knowledge configuring, monitoring, and supporting servers running the Linux operating system. The CompTIA Linux+ XK0-004 exam covers the following topics: Hardware and System Configuration, Systems Operation and Maintenance, Security, Linux Troubleshooting and Diagnostics, Automation and Scripting.