Virtualization

Question 1

Virtualization

Answer 1

• One computer , many Operating Systems
  
  • Mac OS X , Windows 7 , Linux Ubutu all simultaneously
• Separate OS , independent CPU , memory , network, etc
• Hot-based virtualization = normal desktop plus others
• Stand alone server that host virtual machines
  
  • Enterprise level
  • Been around since 1967 / IBM mainframe virtualization

Question 2

The Hypervisor

Answer 2

• Virtual Machine Manager
  
  • Manages the virtual platform & guest operating system
• May require a CPU that supports virtualization
  
  • Can improve performance
• Hardware management
  
  • CPU
  • Networking
  • Security

Question 3

Emulation vs Virtualization

Answer 3

• Virtualization is a native operating system
  
  • Performing native OS process
  • This is identical to using non-virtual system
• Emulation is on device running process designed for completely different architecture
  
  • One device is pretending to be another
  • Original code is being used
  • Code is interpreted for running on the current hardware
  • This commonly slower / emulation very difficult

Question 4

Resource Requirements

Answer 4

• CPU Processor support
  
  • Intel : Virtualization Technology (VT)
  • AMD : AMD-V
• Memory
  
  • Above & beyond host OS requirements
• Disk space
  
  • Each guest OS has its own image

Question 5

Network Requirements

Answer 5

-Most client-side virtual machine managers have their own virtual (internal) network

• Shared network address
  
  • The virtual machine shares same IP address as host
  • Uses a private IP address internally
  • Uses NAT to convert to the physical host IP
• Bridged network address
  
  • The VM is a device on the physical host IP
• Private address
  
  • VM has no communication outside