1. Answer the following two questions briefly.

(a) How many levels of virtualization can one consider? Comment on their advantages, shortcomings, and limitations. What are the typical systems that you know of that have been implemented at each level in the past?

(b) What are the differences between full virtualization and para-virtualization? Explain the advantages, shortcomings, and limitations in the implementation and application of either class of VMs on todays host machines

2. Describe the approaches used to exchange data among the domains of Xen and design experiments to compare the performance of data communication between the domains. This is designed to familiarize you with the Xen programming environment. It may require a longer time to port the Xen codes, implement the application codes, perform the experiments, collect the performance data, and interpret the results