- A
Configure the AWS MGN launch template to use the same private IP addresses as the source servers within the target subnet.
AWS MGN allows specifying private IP addresses in the launch template to match source IPs.
- B
Use AWS Database Migration Service (AWS DMS) to replicate the database and keep the source servers running with the same IPs.
Why wrong: AWS DMS is for database migration, not IP address preservation.
- C
Assign Elastic IP addresses to the source servers and configure the DNS to point to these IPs after migration.
Why wrong: Elastic IPs are public IPs; private IPs cannot be preserved with Elastic IPs.
- D
Set up an AWS Transit Gateway to route traffic between on-premises and AWS with the same IP addresses.
Why wrong: Transit Gateway does not assign IP addresses to instances.
Quick Answer
The answer is to configure the AWS MGN launch template to use the same private IP addresses as the source servers within the target subnet. AWS MGN supports preserving static IP addresses by allowing you to specify the exact private IP during instance launch, provided the target subnet has the required IP available. This is critical for a lift-and-shift migration where other systems rely on those fixed IPs for communication, avoiding immediate reconfiguration. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your understanding of MGN’s launch settings versus networking services like Transit Gateway or Elastic IPs, which are common distractors—remember, Elastic IPs are public, not private. A key memory tip is “MGN maps the MAC to the IP”: if you need the same private IP, set it in the launch template, not in a separate networking service.
PAS-C01 Migration Practice Question
This PAS-C01 practice question tests your understanding of migration. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
A company is planning to migrate its SAP system from on-premises to AWS. The current system consists of two application servers and one database server running SAP HANA on SUSE Linux. The company wants to use a lift-and-shift migration approach to minimize changes. The migration team has set up an AWS Application Migration Service (AWS MGN) replication environment. The team has completed the test migration and is ready for the final cutover. However, during the final cutover, the team realizes that the source application servers have static IP addresses that are used by other systems for communication. The company cannot change these IP addresses immediately. Which step should the team take to ensure that the AWS instances can use the same IP addresses after migration?
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.
Clue:
"immediately / without restart"Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Configure the AWS MGN launch template to use the same private IP addresses as the source servers within the target subnet.
AWS MGN allows launching instances with the same private IP addresses by choosing the appropriate subnet and optionally using a secondary IP address. Option A is wrong because AWS Transit Gateway does not provide IP address preservation. Option B is wrong because Elastic IP addresses are public IPs, not private. Option D is wrong because AWS DMS is for databases, not IP addresses.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure the AWS MGN launch template to use the same private IP addresses as the source servers within the target subnet.
Why this is correct
AWS MGN allows specifying private IP addresses in the launch template to match source IPs.
Clue confirmation
The clue words "minimum / minimize", "immediately / without restart" in the question point toward this answer.
Related concept
CIDR notation defines the prefix length.
- ✗
Use AWS Database Migration Service (AWS DMS) to replicate the database and keep the source servers running with the same IPs.
Why it's wrong here
AWS DMS is for database migration, not IP address preservation.
- ✗
Assign Elastic IP addresses to the source servers and configure the DNS to point to these IPs after migration.
Why it's wrong here
Elastic IPs are public IPs; private IPs cannot be preserved with Elastic IPs.
- ✗
Set up an AWS Transit Gateway to route traffic between on-premises and AWS with the same IP addresses.
Why it's wrong here
Transit Gateway does not assign IP addresses to instances.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
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
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PAS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
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Migration — study guide chapter
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Migration practice questions
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FAQ
Questions learners often ask
What does this PAS-C01 question test?
Migration — This question tests Migration — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Configure the AWS MGN launch template to use the same private IP addresses as the source servers within the target subnet. — AWS MGN allows launching instances with the same private IP addresses by choosing the appropriate subnet and optionally using a secondary IP address. Option A is wrong because AWS Transit Gateway does not provide IP address preservation. Option B is wrong because Elastic IP addresses are public IPs, not private. Option D is wrong because AWS DMS is for databases, not IP addresses.
What should I do if I get this PAS-C01 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PAS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize", "immediately / without restart". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
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