172 Eleventh Hour Security : Exam SY0-201 Study Guide Software RAID is provided through OSs, such as Windows. When RAID is pro- vided through the software, the levels of RAID supported may be limited. Crunch Time RAID 0, 1, 3, and 5 are the most commonly used levels of RAID. While there are other levels of RAID that could possibly be used on a network, these four RAID levels are the ones most likely to appear on your exam. Focus studying on RAID 0, 1, 3, and 5. SPARE PARTS Spare parts refer to additional hardware components that are necessary for serv- ers or other network devices to operate. If a network card or power supply on a server failed, having an extra component on hand makes it possible to replace the part and get the server up and running. Hardware components may provide features that improve the ease and speed of replacing faulty hardware. The fol-