DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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 media company is migrating a 5 TB MongoDB database to Amazon DocumentDB. The migration must have minimal downtime. The source MongoDB uses sharding across 10 shards. Which migration strategy is MOST appropriate?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS DMS with MongoDB as source and DocumentDB as target, enabling CDC
Option B is correct because DocumentDB supports reading from MongoDB oplog for CDC, enabling minimal downtime. Option A is wrong because mongoexport/import is offline. Option C is wrong because S3 is not suitable for CDC. Option D is wrong because DMS does not support DocumentDB as a target.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 native MongoDB replication to sync to DocumentDB
Why it's wrong here
DocumentDB does not support native MongoDB replication protocol.
✓
Use AWS DMS with MongoDB as source and DocumentDB as target, enabling CDC
Why this is correct
DMS supports MongoDB to DocumentDB migration with CDC for minimal downtime.
Related concept
Static NAT maps one inside address to one outside address.
✗
Export data to S3 and use AWS Glue to load into DocumentDB
Why it's wrong here
Glue does not support CDC from MongoDB.
✗
Use mongoexport to export data and mongoimport to import into DocumentDB
Why it's wrong here
Requires downtime and does not support CDC.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.
Deployment and Migration — This question tests Deployment and Migration — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use AWS DMS with MongoDB as source and DocumentDB as target, enabling CDC — Option B is correct because DocumentDB supports reading from MongoDB oplog for CDC, enabling minimal downtime. Option A is wrong because mongoexport/import is offline. Option C is wrong because S3 is not suitable for CDC. Option D is wrong because DMS does not support DocumentDB as a target.
What should I do if I get this DBS-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DBS-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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