Virtualization means to create a virtual version of adevice or resource, such as a server, storage device, network or even an operating system where the framework divides the resource into one or more execution environments. Even something as simple as partitioning a hard drive is considered virtualization because you take one drive and partition it to create two separate hard drives What is ISS? What are the 3 main components of the ISS? How cache works in ISS? Storage Area Network (SAN) and Network Attached Storage (NAS) are widely used concepts in data storage arena. The following YouTube video links gives detailed description of these concepts: Based on the watched videos answer the following questions: Describe NAS and SAN briefly using diagrams?