Question 704 of 997

Deployment →mediumMultiple SelectObjective-mapped

CV0-004 Deployment Practice Question

This CV0-004 practice question tests your understanding of deployment. 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 cloud engineer is planning a database migration from an on-premises Oracle database to Amazon RDS for PostgreSQL. The migration must minimize downtime and preserve ongoing changes. Which TWO services should the engineer consider using together? (Choose two.)

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.

A
AWS DataSync
Why wrong: DataSync is for file storage migration, not databases.
B
AWS Snowball
Why wrong: Snowball is for offline data transfer, not suitable for live database migration with CDC.
C
AWS Database Migration Service (DMS)
DMS supports full load and CDC for minimal downtime migration.
D
Amazon S3 Transfer Acceleration
Why wrong: Transfer Acceleration speeds up S3 uploads, not database migration.
E
AWS Schema Conversion Tool (SCT)
SCT converts source schema and code to target database format.

Full breakdown with real-world context →

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

✓

AWS Database Migration Service (DMS)

AWS DMS can migrate data and replicate ongoing changes using CDC, while the Schema Conversion Tool can convert the Oracle schema to PostgreSQL.

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

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
AWS DataSync
Why it's wrong here
DataSync is for file storage migration, not databases.
✗
AWS Snowball
Why it's wrong here
Snowball is for offline data transfer, not suitable for live database migration with CDC.
✓
AWS Database Migration Service (DMS)
Why this is correct
DMS supports full load and CDC for minimal downtime migration.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
Amazon S3 Transfer Acceleration
Why it's wrong here
Transfer Acceleration speeds up S3 uploads, not database migration.
✓
AWS Schema Conversion Tool (SCT)
Why this is correct
SCT converts source schema and code to target database format.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.

Common exam traps

Common exam trap: ACLs stop at the first match

ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.

Detailed technical explanation

How to think about this question

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.

KKey Concepts to Remember

Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.

TExam Day Tips

Check inbound versus outbound direction.
Read the ACL from top to bottom.
Look for a broader permit or deny above the intended line.

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

How this comes up in practice

A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.

What to study next

Got this wrong? Here's your next step.

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 CV0-004 ACL questions on filtering logic and placement.

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FAQ

Questions learners often ask

What does this CV0-004 question test?

Deployment — This question tests Deployment — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: AWS Database Migration Service (DMS) — AWS DMS can migrate data and replicate ongoing changes using CDC, while the Schema Conversion Tool can convert the Oracle schema to PostgreSQL.

What should I do if I get this CV0-004 question wrong?

Are there clue words in this question I should notice?

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.

What is the key concept behind this question?

Standard ACLs match source addresses.

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Last reviewed: Jul 4, 2026

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