1- What aspects or characteristics of our current network of networks allows distributed system run in an uninhibited and cohesive fashion

2-Describe some of the challenges that one faces when creating and deploying distributed systems. These would speak directly to the characteristics of distributed systems that are challenging in the scope of today's distributed systems that run atop the network of networks that is the internet (give examples where appropriate)

3-Describe the facility that allows multiple types of operating systems to run in a virtualized environment with varying types of hardware. Include why this is so difficult and what challenges are overcome.