The correct answer is to use AWS DMS with MongoDB as source and DocumentDB as target, enabling ongoing replication. This strategy works because AWS DMS natively supports MongoDB as a source endpoint and can perform a full load followed by continuous change data capture (CDC) to keep the target DocumentDB synchronized, effectively handling sharded collections by flattening them into a single DocumentDB cluster. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding that DocumentDB does not support native MongoDB replication protocols or sharding, so DMS is the only managed service that bridges the gap for a live migration with minimal downtime. A common trap is choosing mongodump/mongorestore, which fails to preserve shard metadata and requires application downtime, or assuming DocumentDB can act as a replica set member. Memory tip: "DMS Does Migration for Shards" — when shards are involved, DMS is the only direct path to DocumentDB.
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 planning to migrate a MongoDB database to Amazon DocumentDB. The database has several sharded collections. Which migration strategy should be used?
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 ongoing replication.
Option A is correct because AWS DMS supports MongoDB as a source and DocumentDB as a target for continuous migration. Option B is wrong because mongodump/mongorestore does not handle sharding well and requires downtime. Option C is wrong because DocumentDB does not support native replication from MongoDB. Option D is wrong because DocumentDB does not have a sharding feature like MongoDB.
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.
✗
Set up MongoDB replica set to replicate directly to DocumentDB.
Why it's wrong here
DocumentDB does not support native replication from MongoDB.
✓
Use AWS DMS with MongoDB as source and DocumentDB as target, enabling ongoing replication.
Why this is correct
DMS supports homogeneous migration with minimal downtime.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use AWS Schema Conversion Tool (SCT) to convert the schema, then manually migrate data.
Why it's wrong here
SCT is for schema conversion, not data migration for DocumentDB.
✗
Export data using mongodump and import using mongorestore.
Why it's wrong here
Does not handle sharding well and causes downtime.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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 ongoing replication. — Option A is correct because AWS DMS supports MongoDB as a source and DocumentDB as a target for continuous migration. Option B is wrong because mongodump/mongorestore does not handle sharding well and requires downtime. Option C is wrong because DocumentDB does not support native replication from MongoDB. Option D is wrong because DocumentDB does not have a sharding feature like MongoDB.
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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