IP Addresses & Interfaces

Question 1

What is a Public IP Address

Answer 1

• Released when instance stopped
• Used in Public Subnets
• Associated with private IP address on instance
• Cannot be moved between instances

Question 2

What is a Private IP Address

Answer 2

• Retained when instance stopped
• Used in Private & Public subnets.

Question 3

What is an Elastic IP Address?

Answer 3

• Has Static IP Address
• Chargeable
• Associated with Private IP Address on instance.
• Can be moved b/w instances & Elastic Network Adapters.

Question 4

What is the Elastic Network Interface (ENI)?

Answer 4

• Basic type when don’t need high-performance.
• Can use all instance types.

Question 5

What is the Elastic Network Adapter (ENA)?

Answer 5

• Enhanced Networking performance
• Higher bandwidth
• Lower inter-instance latency
• Must choose supported instance type.

Question 6

What is the Elastic Fabric Adapter (EFA)?

Answer 6

• Use with High Performance Computing & MPI & ML use cases.
• Tightly coupled applications
• Can use all instance types.