Quick Answer
The answer is to assign an Elastic IP address to the SAP instance. This approach is correct because an Elastic IP provides a static public IPv4 address that remains associated with the instance even after a migration, directly solving the problem of a hardcoded IP address for RFC connections without requiring any changes to the custom ABAP application. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your understanding of how to handle network dependencies during an SAP migration, specifically the trade-off between minimizing application changes and leveraging AWS networking features. A common trap is choosing DNS-based solutions, which would force you to modify the hardcoded IP reference in the ABAP code, or selecting a NAT Gateway, which only handles outbound traffic. Remember the memory tip: for a hardcoded IP, think “Elastic IP sticks like glue,” ensuring the RFC endpoint stays constant and your ABAP code remains untouched.
This PAS-C01 practice question tests your understanding of migration. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An organization is planning to migrate an SAP ERP system from on-premises to AWS. The system uses a custom ABAP application that has a hardcoded IP address for RFC connections. The migration strategy must minimize changes to the application. What is the MOST effective approach?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Use a NAT Gateway to provide a fixed IP
Why wrong: NAT Gateway is for outbound, not inbound RFC.
Use VPC Peering to connect on-premises to AWS
Why wrong: Does not provide a fixed IP for the application.
Use a DNS name and update the application to use the DNS name
Why wrong: Requires application code change.
Assign an Elastic IP address to the SAP instance
Provides a static IP that can be retained after migration.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Assign an Elastic IP address to the SAP instance
Using an Elastic IP ensures the public IP remains the same after migration, avoiding application changes. Option A (DNS) would require application changes. Option C (NAT Gateway) is for outbound traffic. Option D (VPC Peering) does not provide a fixed IP.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Use a NAT Gateway to provide a fixed IP
Use VPC Peering to connect on-premises to AWS
Why it's wrong here
Does not provide a fixed IP for the application.
Use a DNS name and update the application to use the DNS name
Why it's wrong here
Requires application code change.
Assign an Elastic IP address to the SAP instance
Why this is correct
Provides a static IP that can be retained after migration.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PAS-C01 NAT questions on configuration and troubleshooting.
Migration — study guide chapter
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FAQ
Migration — This question tests Migration — Static NAT maps one inside address to one outside address..
The correct answer is: Assign an Elastic IP address to the SAP instance — Using an Elastic IP ensures the public IP remains the same after migration, avoiding application changes. Option A (DNS) would require application changes. Option C (NAT Gateway) is for outbound traffic. Option D (VPC Peering) does not provide a fixed IP.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PAS-C01 NAT questions on configuration and troubleshooting.
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
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