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Question 245 of 1,040

Design Resilient Architectures →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is an active/active design with multi-Region data replication, such as DynamoDB global tables, because this architecture allows writes to occur in any Region while asynchronously replicating data across Regions with sub-second latency, ensuring near-zero data loss and continuous write availability even during a full Regional outage. This approach directly satisfies the requirements for active-active multi-region data replication, as Route 53 latency-based routing directs users to the closest healthy Region for uninterrupted writes. On the SAA-C03 exam, this scenario tests your understanding of balancing write-heavy workloads with disaster recovery—a common trap is choosing a passive failover setup like RDS Multi-AZ, which cannot handle writes during an outage in the primary Region. Remember the key trade-off: active-active sacrifices strong consistency for availability and low RPO. Memory tip: think “Global Tables = Global Writes” to instantly recall that DynamoDB global tables are the go-to for active-active multi-region data replication.

SAA-C03 Design Resilient Architectures Practice Question

This SAA-C03 practice question tests your understanding of design resilient architectures. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: active/active architecture allows simultaneous operations in multiple Regions.. 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 global application experiences frequent writes and must survive a full Regional outage with near-zero data loss. The product team also requires that users can continue to write during the incident using the closest Region. Which approach is most aligned with these requirements?

Question 1mediummultiple choice

Full question →

A
Use an active/active design with multi-Region data replication (for example, global tables for the write-heavy datastore) and route traffic to multiple Regions based on health and latency.
Active/active supports writing in multiple Regions and reduces the blast radius of a Regional failure while enabling continued operations.
B
Use warm standby with periodic backups of the primary write datastore every 24 hours.
Why wrong: Periodic backups do not provide near-zero data loss and can cause long RPO during an outage.
C
Use pilot light where the secondary Region runs only infrastructure templates and starts data replication only after detecting failure.
Why wrong: Starting replication after failure defeats the “near-zero data loss” and “write during incident” requirement.
D
Use a single-writer model in one Region and deploy read-only replicas in the other Region for continuity.
Why wrong: Read-only replicas cannot support continued writes during a Regional outage without failover mechanisms.

Full breakdown with real-world context →

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

Use an active/active design with multi-Region data replication (for example, global tables for the write-heavy datastore) and route traffic to multiple Regions based on health and latency.

Option A is correct because an active/active design with multi-Region data replication, such as DynamoDB global tables, allows writes to occur in any Region and replicates data asynchronously across Regions with sub-second latency. This ensures near-zero data loss (RPO of seconds) and continuous write availability during a full Regional outage, while Route 53 latency-based routing directs users to the closest healthy Region.

Key principle: Active/active architecture allows simultaneous operations in multiple Regions.

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 an active/active design with multi-Region data replication (for example, global tables for the write-heavy datastore) and route traffic to multiple Regions based on health and latency.
Why this is correct
Active/active supports writing in multiple Regions and reduces the blast radius of a Regional failure while enabling continued operations.
Related concept
Active/active architecture allows simultaneous operations in multiple Regions.
✗
Use warm standby with periodic backups of the primary write datastore every 24 hours.
Why it's wrong here
Periodic backups do not provide near-zero data loss and can cause long RPO during an outage.
✗
Use pilot light where the secondary Region runs only infrastructure templates and starts data replication only after detecting failure.
Why it's wrong here
Starting replication after failure defeats the “near-zero data loss” and “write during incident” requirement.
✗
Use a single-writer model in one Region and deploy read-only replicas in the other Region for continuity.
Why it's wrong here
Read-only replicas cannot support continued writes during a Regional outage without failover mechanisms.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often confuse 'read-only replicas' (which cannot accept writes) with 'multi-Region write replicas' (which can), leading them to choose Option D despite its inability to support writes during an outage.

Detailed technical explanation

How to think about this question

DynamoDB global tables use a last-writer-wins conflict resolution mechanism based on timestamps, ensuring eventual consistency across Regions. Under the hood, each write is replicated via DynamoDB Streams and AWS Lambda functions, with replication typically completing within one second under normal conditions. In a real-world scenario, a financial trading application using global tables can tolerate a full Region failure with only a few seconds of data loss while traders continue to submit orders from the nearest healthy Region.

KKey Concepts to Remember

Active/active architecture allows simultaneous operations in multiple Regions.
DynamoDB Global Tables provide multi-Region, active-active replication for writes.
Route 53 can route traffic based on latency and health checks for failover.
Near-zero RPO is achieved through continuous, asynchronous data replication.

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

Active/active architecture allows simultaneous operations in multiple Regions.

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.

Review active/active architecture allows simultaneous operations in multiple Regions., then practise related SAA-C03 questions on the same topic to reinforce the concept.

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FAQ

Questions learners often ask

What does this SAA-C03 question test?

Design Resilient Architectures — This question tests Design Resilient Architectures — Active/active architecture allows simultaneous operations in multiple Regions..

What is the correct answer to this question?

The correct answer is: Use an active/active design with multi-Region data replication (for example, global tables for the write-heavy datastore) and route traffic to multiple Regions based on health and latency. — Option A is correct because an active/active design with multi-Region data replication, such as DynamoDB global tables, allows writes to occur in any Region and replicates data asynchronously across Regions with sub-second latency. This ensures near-zero data loss (RPO of seconds) and continuous write availability during a full Regional outage, while Route 53 latency-based routing directs users to the closest healthy Region.

What should I do if I get this SAA-C03 question wrong?

Review active/active architecture allows simultaneous operations in multiple Regions., then practise related SAA-C03 questions on the same topic to reinforce the concept.

What is the key concept behind this question?

Active/active architecture allows simultaneous operations in multiple Regions.

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Same concept, more angles

1 more ways this is tested on SAA-C03

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A global application experiences frequent writes and must survive a full Regional outage with near-zero data loss. The product team also requires that users can continue to write during the incident using the closest Region. Which approach is most aligned with these requirements?

medium

✓ A.Use an active/active design with multi-Region data replication (for example, global tables for the write-heavy datastore) and route traffic to multiple Regions based on health and latency.
B.Use warm standby with periodic backups of the primary write datastore every 24 hours.
C.Use pilot light where the secondary Region runs only infrastructure templates and starts data replication only after detecting failure.
D.Use a single-writer model in one Region and deploy read-only replicas in the other Region for continuity.

Why A: Option A is correct because an active/active design with multi-Region data replication, such as Amazon DynamoDB global tables, allows writes to occur in any Region and replicates them to all other Regions with near-real-time latency (typically sub-second). This meets the requirement for near-zero data loss during a full Regional outage, as data is asynchronously replicated to multiple Regions, and users can continue writing to the closest healthy Region via Route 53 latency-based or geolocation routing.

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