DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and 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 a 2 TB Oracle database to Amazon Aurora PostgreSQL. The on-premises database is 2 TB and the network link is 1 Gbps. The migration must complete within 48 hours with minimal data loss. The DBA has extracted the schema using AWS SCT and created an Aurora cluster. The DBA now needs to transfer the data. The DBA tried using AWS DMS over the network but estimates it will take 72 hours due to network overhead. The DBA also considered using an AWS Snowball Edge device but is concerned about the time to order and ship the device. Which approach should the DBA take to meet the deadline?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS Snowball Edge to transfer the database dump and then use DMS for change data capture
Option C is correct. The DBA should use AWS DMS with CDC to start the migration, then use a Snowball Edge for the initial load to reduce time. However, given the 48-hour window, using DMS with CDC and compressing data may still be too slow. Option B is actually the best: use Snowball Edge for initial load (which can be ordered and shipped quickly if available in region) and then DMS for CDC. But the correct answer according to best practices is to use DMS with CDC and optimize network (e.g., using compression, increasing instance size). However, the scenario suggests DMS alone is too slow. The best answer is to use Snowball Edge for the full load and DMS for CDC, as Snowball can transfer 2 TB quickly once received. Option A is wrong because it abandons CDC. Option B is correct because it combines Snowball for bulk and DMS for ongoing changes. Option C is wrong because it only uses DMS. Option D is wrong because it uses S3 only.
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.
✗
Use AWS DMS with change data capture and optimize the network by enabling compression
Why it's wrong here
Even with compression, the network may still be too slow for 2 TB within 48 hours.
✗
Use AWS S3 to upload the database dump and then load into Aurora
Why it's wrong here
Uploading to S3 still uses the 1 Gbps network and may not meet the deadline.
✓
Use AWS Snowball Edge to transfer the database dump and then use DMS for change data capture
Why this is correct
Snowball Edge can transfer the bulk data faster than the network, and DMS can capture ongoing changes.
Related concept
Standard ACLs match source addresses.
✗
Use AWS DMS to perform a full load and then stop replication, accepting some data loss
Why it's wrong here
This does not meet the minimal data loss requirement.
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 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 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 DBS-C01 ACL questions on filtering logic and placement.
Deployment and Migration — This question tests Deployment and Migration — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Use AWS Snowball Edge to transfer the database dump and then use DMS for change data capture — Option C is correct. The DBA should use AWS DMS with CDC to start the migration, then use a Snowball Edge for the initial load to reduce time. However, given the 48-hour window, using DMS with CDC and compressing data may still be too slow. Option B is actually the best: use Snowball Edge for initial load (which can be ordered and shipped quickly if available in region) and then DMS for CDC. But the correct answer according to best practices is to use DMS with CDC and optimize network (e.g., using compression, increasing instance size). However, the scenario suggests DMS alone is too slow. The best answer is to use Snowball Edge for the full load and DMS for CDC, as Snowball can transfer 2 TB quickly once received. Option A is wrong because it abandons CDC. Option B is correct because it combines Snowball for bulk and DMS for ongoing changes. Option C is wrong because it only uses DMS. Option D is wrong because it uses S3 only.
What should I do if I get this DBS-C01 question wrong?
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 DBS-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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