The answer is the missing permissions are dms:CreateReplicationInstance and dms:CreateEndpoint. This is because AWS DMS requires explicit IAM permissions to provision the underlying infrastructure for a migration task, including creating the replication instance that processes the data and the endpoints that connect to source and target databases. Without these actions, the DMS service cannot allocate the necessary compute resources or establish the database connections, even if other permissions like S3 or EC2 Describe are present. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this tests your understanding of the principle of least privilege and the specific resource lifecycle actions DMS needs, often appearing as a trap where candidates assume read-only or describe permissions are sufficient. A common memory tip is “DMS needs to build before it can move”—think of CreateReplicationInstance and CreateEndpoint as the “build” permissions that are frequently overlooked in migration-focused policies.
PAS-C01 Migration Practice Question
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 IAM policy for a migration team is shown in the exhibit. The team is unable to start a DMS replication task. What is the most likely missing permission?
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
✓
dms:CreateReplicationInstance and dms:CreateEndpoint
Option C is correct because DMS requires permissions to create and manage DMS resources like replication instances, endpoints, and subnet groups. The policy lacks 'dms:CreateReplicationInstance' and 'dms:CreateEndpoint' which are necessary for the task to function. Option A is wrong because S3 permissions are present. Option B is wrong because EC2 Describe actions are present. Option D is wrong because KMS is not mentioned and may not be needed.
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.
✓
dms:CreateReplicationInstance and dms:CreateEndpoint
Why this is correct
DMS needs these to set up the migration infrastructure.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
ListBucket is not required for the replication task.
✗
kms:Decrypt
Why it's wrong here
No encryption is specified.
✗
ec2:CreateNetworkInterface
Why it's wrong here
DMS creates ENIs automatically if permissions are present, but the policy lacks broader DMS permissions.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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.
Migration — This question tests Migration — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: dms:CreateReplicationInstance and dms:CreateEndpoint — Option C is correct because DMS requires permissions to create and manage DMS resources like replication instances, endpoints, and subnet groups. The policy lacks 'dms:CreateReplicationInstance' and 'dms:CreateEndpoint' which are necessary for the task to function. Option A is wrong because S3 permissions are present. Option B is wrong because EC2 Describe actions are present. Option D is wrong because KMS is not mentioned and may not be needed.
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: "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.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Refer to the exhibit. A migration engineer is setting up an IAM policy for an AWS DMS task that will replicate data from an on-premises SAP ASE database to Amazon RDS for SAP ASE. The engineer wants to ensure the DMS task can be created and started. What is missing from this policy?
medium
✓ A.Permissions to create DMS endpoints (dms:CreateEndpoint)
B.Permissions to describe DMS replication instances
C.Permissions to start and stop replication tasks
D.Permissions to use AWS Key Management Service (KMS) for encryption
Why A: Option A is correct because DMS needs 'dms:CreateEndpoint' to create source/target endpoints. Option B is incorrect because the policy already allows DescribeReplicationTasks. Option C is incorrect because KMS is not used here. Option D is incorrect because the policy allows StartReplicationTask, but without endpoints, it won't work.
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This PAS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PAS-C01 exam.
Question Discussion
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