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.
A company is migrating an on-premises Oracle database to Amazon RDS for Oracle. The database is 2 TB in size and has a high transaction rate. The migration must have minimal downtime. Which AWS service should be used for the migration?
AWS Snowball Edge
Why wrong: Snowball is for offline bulk data transfer, not minimal downtime.
AWS Server Migration Service (SMS)
Why wrong: SMS is for server volume migrations, not databases.
AWS DataSync
Why wrong: DataSync is for file transfers, not database replication.
AWS Database Migration Service (DMS)
DMS supports live migration with ongoing replication.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
AWS Database Migration Service (DMS)
AWS Database Migration Service (DMS) supports ongoing replication to minimize downtime during migration. Option A is wrong because AWS Server Migration Service is for server migrations, not databases. Option C is wrong because AWS DataSync is for file-based data transfers. Option D is wrong because AWS Snowball is for large-scale offline data transfer, not suitable for minimal downtime scenarios.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
AWS Snowball Edge
Why it's wrong here
Snowball is for offline bulk data transfer, not minimal downtime.
AWS Server Migration Service (SMS)
Why it's wrong here
SMS is for server volume migrations, not databases.
AWS DataSync
Why it's wrong here
DataSync is for file transfers, not database replication.
AWS Database Migration Service (DMS)
Why this is correct
DMS supports live migration with ongoing replication.
Related concept
Standard ACLs match source addresses.
Common exam traps
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PAS-C01 ACL questions on filtering logic and placement.
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FAQ
Migration — This question tests Migration — Standard ACLs match source addresses..
The correct answer is: AWS Database Migration Service (DMS) — AWS Database Migration Service (DMS) supports ongoing replication to minimize downtime during migration. Option A is wrong because AWS Server Migration Service is for server migrations, not databases. Option C is wrong because AWS DataSync is for file-based data transfers. Option D is wrong because AWS Snowball is for large-scale offline data transfer, not suitable for minimal downtime scenarios.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PAS-C01 ACL questions on filtering logic and placement.
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
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.
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