Virtual Networking

Question 1

Network virtualization

Answer 1

• Server farm with 100 individual computers
• All servers are connected with enterprise switches
and routers, with redundancy

• Migrate 100 physical servers
• To one physical server with 100 virtual servers
inside

• What happens to the network?

Question 2

The hypervisor

Answer 2

• Virtual Machine Manager
  
  • Manages the virtual platform and guest OS
• May require a CPU that supports virtualization
  
  • Can improve performance
• Hardware management
  
  • CPU, networking, security

Question 3

Network requirements

Answer 3

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

• Shared network address
• The virtual machine shares the same IP address
as the physical 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 network

• Private address
• The VM does not communicate outside of the virtual
network