The answer is network bandwidth and latency between source and target, along with a compatibility check for unsupported MongoDB features. When migrating a 2 TB MongoDB database to Amazon DocumentDB, network throughput directly determines how quickly the initial sync and ongoing change data capture can transfer data, while high latency can cause timeouts or replication lag. On the AWS Certified Database Specialty DBS-C01 exam, this scenario tests your understanding that DocumentDB is not a drop-in replacement—it lacks certain index types and aggregation operators, so you must audit your application’s queries first. A common trap is assuming DocumentDB supports all MongoDB features or that backup methods like S3 are involved; in reality, DocumentDB uses its own automated backups and IAM for authentication, not LDAP. Remember the mnemonic “Bandwidth and Bugs” to recall that network capacity and feature compatibility are the two critical factors before any migration.
DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 MongoDB database to Amazon DocumentDB. Which TWO factors should be considered when planning the migration?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Source MongoDB version compatibility with DocumentDB.
DocumentDB does not support all MongoDB features (e.g., some index types), so compatibility check is needed. Network bandwidth impacts migration speed. Option C: DocumentDB supports TLS. Option D: DocumentDB uses IAM for auth, not LDAP. Option E: DocumentDB uses its own backup, not S3.
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.
✗
DocumentDB stores backups in Amazon S3 automatically.
Why it's wrong here
DocumentDB has its own backup mechanism.
✗
DocumentDB requires LDAP for authentication.
Why it's wrong here
DocumentDB uses IAM or password authentication.
✗
DocumentDB does not support encryption in transit.
Source MongoDB version compatibility with DocumentDB.
Why this is correct
DocumentDB may not support all MongoDB versions.
Related concept
Static NAT maps one inside address to one outside address.
✓
Network bandwidth and latency between source and target.
Why this is correct
Affects migration speed and feasibility.
Related concept
Static NAT maps one inside address to one outside address.
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: Source MongoDB version compatibility with DocumentDB. — DocumentDB does not support all MongoDB features (e.g., some index types), so compatibility check is needed. Network bandwidth impacts migration speed. Option C: DocumentDB supports TLS. Option D: DocumentDB uses IAM for auth, not LDAP. Option E: DocumentDB uses its own backup, not S3.
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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