Networking Cost

• Traffic from Public Internet to Instance is free
• Traffic from one Instance to another Instance in same AZ is free
• Traffic from one Instance to another Instance in different AZ
• 0.02 for Public Network / Elastic IP
• 0.01 for Private IP
• Traffic from one Region to another Region is 0.02
• Best Practice
• Uses Private IP instead of Public IP
  • Low cost, better performance
• Use same AZ as more as possible
  • Risk on HA