This DBS-C01 practice question tests your understanding of database security. 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 security engineer is designing a disaster recovery plan for an Amazon DynamoDB table that contains sensitive data. The table is encrypted using an AWS KMS customer managed key (CMK). The engineer needs to ensure that the table can be restored in a different AWS Region. Which TWO actions must be taken to enable cross-region restores with the same encryption? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable point-in-time recovery (PITR) on the table.
Option B and D are correct. DynamoDB cross-region restores require the KMS key to be available in the destination region, which means creating a replica key. The table must also have point-in-time recovery (PITR) enabled. Option A is wrong because cross-region replication is for live data, not backups. Option C is wrong because CloudHSM keys are not supported for DynamoDB encryption. Option E is wrong because the key must be in the destination region.
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.
✓
Enable point-in-time recovery (PITR) on the table.
Why this is correct
PITR is required for cross-region restores.
Related concept
Static NAT maps one inside address to one outside address.
✗
Enable DynamoDB global tables.
Why it's wrong here
Global tables replicate live data, not backups.
✗
Export the table to S3 and copy the S3 objects to the destination Region.
Why it's wrong here
This would require re-encryption with a new key.
✓
Create a multi-Region KMS key in the source and replicate it to the destination Region.
Why this is correct
Multi-Region keys allow decryption in the destination.
Related concept
Static NAT maps one inside address to one outside address.
✗
Create a CloudHSM key and use it for encryption.
Why it's wrong here
DynamoDB does not support CloudHSM.
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.
Database Security — This question tests Database Security — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Enable point-in-time recovery (PITR) on the table. — Option B and D are correct. DynamoDB cross-region restores require the KMS key to be available in the destination region, which means creating a replica key. The table must also have point-in-time recovery (PITR) enabled. Option A is wrong because cross-region replication is for live data, not backups. Option C is wrong because CloudHSM keys are not supported for DynamoDB encryption. Option E is wrong because the key must be in the destination region.
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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