A company is migrating a legacy application to AWS. The application uses hardcoded IP addresses to communicate with an on-premises mainframe. The mainframe cannot be updated to use DNS. How can the architect ensure the AWS application can communicate with the mainframe over AWS Direct Connect?

Answer options:

Assign the hardcoded on-premises IP addresses to the EC2 instances in AWS.

Use AWS PrivateLink to create an endpoint for the mainframe.

Configure the VPC route table to route the hardcoded IP addresses over the Direct Connect connection.

Use AWS Global Accelerator to provide fixed IP addresses for the mainframe.

How to approach this question

Recognize that standard IP routing over Direct Connect handles hardcoded IPs, provided there is no CIDR overlap.

Full Answer

C.Configure the VPC route table to route the hardcoded IP addresses over the Direct Connect connection.✓ Correct

If the application uses hardcoded IP addresses for the on-premises mainframe, you simply need to ensure the VPC route table has a route for those IP addresses pointing to the Virtual Private Gateway (VGW) or Transit Gateway attached to the Direct Connect connection.

Common mistakes

Overcomplicating the solution with DNS or NAT when simple routing is sufficient.

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