The answer is DynamoDB’s automatic multi-AZ replication and its on-demand backup with point-in-time recovery. Multi-AZ replication ensures high availability and durability by synchronously copying data across three Availability Zones within a Region, so a full AZ failure does not disrupt access or lose data—this is what delivers the 99.999999999% durability SLA. On-demand backup and point-in-time recovery provide an additional safety net, allowing you to restore your table to any second within the last 35 days, which is critical for disaster recovery and compliance. On the AWS Certified Data Engineer Associate DEA-C01 exam, this question tests your understanding of DynamoDB’s built-in resilience versus optional backup features; a common trap is confusing cross-Region replication (Global Tables) with the automatic intra-Region replication across AZs. Remember the mnemonic: “Three AZs for always-on, PITR for gone-wrong.”
DEA-C01 Data Store Management Practice Question
This DEA-C01 practice question tests your understanding of data store management. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Which TWO features of Amazon DynamoDB help ensure high availability and durability? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Data is automatically replicated across multiple Availability Zones within an AWS Region.
Option B is correct because DynamoDB automatically replicates data synchronously across three Availability Zones (AZs) within an AWS Region. This built-in replication ensures that even if an entire AZ fails, the data remains available and durable, providing a 99.999999999% (11 nines) durability SLA.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Auto-scaling adjusts provisioned capacity based on traffic.
Why it's wrong here
Auto-scaling is for performance, not durability.
✓
Data is automatically replicated across multiple Availability Zones within an AWS Region.
Why this is correct
Provides high availability and durability.
Related concept
Read the scenario before looking for a memorised answer.
✗
Global tables enable active-active replication across multiple AWS Regions.
Why it's wrong here
Global tables are for multi-Region, not within a Region.
✓
On-demand backup and restore provides point-in-time recovery.
Why this is correct
Enables recovery from accidental writes or deletions.
Related concept
Read the scenario before looking for a memorised answer.
✗
Time to Live (TTL) automatically deletes expired items.
Why it's wrong here
TTL is for data lifecycle, not availability.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse auto-scaling (Option A) with high availability, but auto-scaling only adjusts capacity to meet demand, not data replication or fault tolerance.
Detailed technical explanation
How to think about this question
DynamoDB stores each item across three AZs using synchronous replication, meaning a write is acknowledged only after it is durably written to all three AZs. This design leverages the AWS Nitro System and SSD-backed storage to achieve low-latency writes while maintaining strong consistency. In a real-world scenario, if an AZ experiences a power outage, DynamoDB automatically redirects read and write traffic to the remaining AZs without any manual intervention, ensuring continuous availability.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Data Store Management — This question tests Data Store Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Data is automatically replicated across multiple Availability Zones within an AWS Region. — Option B is correct because DynamoDB automatically replicates data synchronously across three Availability Zones (AZs) within an AWS Region. This built-in replication ensures that even if an entire AZ fails, the data remains available and durable, providing a 99.999999999% (11 nines) durability SLA.
What should I do if I get this DEA-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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