The answer is that the target VPC subnet does not have enough available IP addresses, which directly causes the AWS MGN test cutover to fail with the 'Insufficient IP address space in the target VPC' error. When AWS Application Migration Service launches a test instance during a cutover, it must assign an IP address from the target VPC’s subnet; if the subnet’s CIDR range is exhausted—often due to overlapping IP reservations or too many running instances—the launch cannot proceed. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of how MGN interacts with VPC networking during migration waves, and a common trap is confusing this with replication settings or IAM permissions, which produce different errors. Remember the memory tip: “IPs for launches, not for replications”—the error points squarely to subnet capacity, not agent configuration.
SAP-C02 Practice Question: Accelerate Workload Migration and Modernization
This SAP-C02 practice question tests your understanding of accelerate workload migration and modernization. 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 migrating workloads to AWS using AWS Application Migration Service (AWS MGN). The source servers are running on VMware vSphere. After installing the AWS Replication Agent on the source servers, the migration waves are set up. However, during a test cutover, the test instance fails to launch with an error 'Insufficient IP address space in the target VPC'. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The target VPC subnet does not have enough available IP addresses
Option B is correct: AWS MGN creates instances with IPs from the target VPC subnet; insufficient IPs cause launch failure. Option A (replication settings) affect data replication, not launch. Option C (IAM permissions) typically cause access denied, not IP error. Option D (license agreement) would show different errors.
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.
✗
The replication settings specify a subnet with an incorrect CIDR block
Why it's wrong here
Replication settings affect data replication, not test instance launch IP allocation.
✗
The IAM role for AWS MGN does not have permissions to create network interfaces
Why it's wrong here
Missing permissions would cause an access denied error, not an IP space error.
✓
The target VPC subnet does not have enough available IP addresses
Why this is correct
The test instance requires an available IP in the target subnet; insufficient IPs cause launch failure.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
The AWS MGN service is not enabled in the target AWS Region
Why it's wrong here
Service not enabled would prevent replication, not cause a subnet IP error.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 SAP-C02 subnetting questions on CIDR, address ranges, and subnet selection.
Accelerate Workload Migration and Modernization — This question tests Accelerate Workload Migration and Modernization — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: The target VPC subnet does not have enough available IP addresses — Option B is correct: AWS MGN creates instances with IPs from the target VPC subnet; insufficient IPs cause launch failure. Option A (replication settings) affect data replication, not launch. Option C (IAM permissions) typically cause access denied, not IP error. Option D (license agreement) would show different errors.
What should I do if I get this SAP-C02 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 SAP-C02 subnetting questions on CIDR, address ranges, and subnet selection.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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