An organization is migrating its on-premises data center to AWS. They have a legacy application hardcoded to use specific IP addresses. The application must be migrated to AWS without changing these IP addresses. The on-premises network will remain connected to AWS via Direct Connect. How can the architect achieve this?

Answer options:

A.

Create a VPC with the exact same CIDR block as the on-premises network and use VPC peering.

B.

Bring Your Own IP (BYOIP) to AWS and assign the IP addresses to the EC2 instances.

C.

Use AWS PrivateLink to map the on-premises IPs to AWS IPs.

D.

Configure a NAT Gateway to translate the AWS IPs to the legacy on-premises IPs.

How to approach this question

Identify the feature that allows custom IP ranges in AWS.

Full Answer

B.Bring Your Own IP (BYOIP) to AWS and assign the IP addresses to the EC2 instances.✓ Correct

AWS allows you to Bring Your Own IP (BYOIP) addresses. You can bring part or all of your publicly routable IPv4 or IPv6 address range to your AWS account, allowing legacy apps to retain their hardcoded IPs.

Common mistakes

Trying to use overlapping CIDRs, which breaks routing.

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