- A
Use Amazon RDS with cross-Region replication enabled using MySQL binary log
Why wrong: Cross-Region replication with binlog is asynchronous and can have significant lag, leading to eventual consistency only.
- B
Use Amazon RDS Multi-AZ deployments in each region with read replicas
Why wrong: Multi-AZ provides high availability within a region, but read replicas across regions have replication lag, so read-after-write consistency is not guaranteed.
- C
Use Amazon Aurora Global Database with cluster endpoints in each region
Aurora Global Database uses dedicated replication infrastructure with typical latency under 1 second and supports read-after-write consistency via global transaction IDs.
- D
Use Amazon RDS with synchronous replication across regions
Why wrong: Synchronous replication across regions is not supported by RDS; it would require custom solutions and introduce high latency.
Quick Answer
The correct choice is Amazon Aurora Global Database with cluster endpoints in each region because it delivers read-after-write consistency across regions through its storage-layer replication, which physically synchronizes data at the block level rather than relying on asynchronous binary logs. This mechanism ensures that once a write is committed in the primary region, all read replicas in secondary regions reflect that write with typical latency under one second, meeting the strict consistency requirement. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this question tests your ability to distinguish between Aurora Global Database and standard RDS cross-Region replication—a common trap is assuming MySQL’s native replication suffices, but it can introduce lag and inconsistency. Remember the memory tip: “Aurora’s storage syncs globally, so reads never lag locally.”
ANS-C01 Network Design Practice Question
This ANS-C01 practice question tests your understanding of network design. 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 designing a multi-region application with Amazon RDS for MySQL as the primary database. The application requires read-after-write consistency across regions. Which design should the company choose to meet this requirement?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"primary"Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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 Amazon Aurora Global Database with cluster endpoints in each region
Amazon Aurora Global Database is the correct choice because it provides dedicated cluster endpoints in each region that automatically route write traffic to the primary region and read traffic to local replicas, ensuring read-after-write consistency through its storage-layer replication with typical latency under 1 second. Unlike standard RDS cross-Region replication, Aurora Global Database uses a physical storage-based replication mechanism that guarantees global consistency without relying on MySQL binary logs, which can introduce replication lag and potential inconsistency.
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.
- ✗
Use Amazon RDS with cross-Region replication enabled using MySQL binary log
Why it's wrong here
Cross-Region replication with binlog is asynchronous and can have significant lag, leading to eventual consistency only.
- ✗
Use Amazon RDS Multi-AZ deployments in each region with read replicas
Why it's wrong here
Multi-AZ provides high availability within a region, but read replicas across regions have replication lag, so read-after-write consistency is not guaranteed.
- ✓
Use Amazon Aurora Global Database with cluster endpoints in each region
Why this is correct
Aurora Global Database uses dedicated replication infrastructure with typical latency under 1 second and supports read-after-write consistency via global transaction IDs.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use Amazon RDS with synchronous replication across regions
Why it's wrong here
Synchronous replication across regions is not supported by RDS; it would require custom solutions and introduce high latency.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the misconception that standard RDS cross-Region replication (Option A) can provide read-after-write consistency, but the trap is that MySQL binary log replication is inherently asynchronous and cannot guarantee global consistency, whereas Aurora Global Database's storage-level replication is designed specifically for this purpose.
Detailed technical explanation
How to think about this question
Aurora Global Database leverages a distributed storage system where the primary region writes to a shared storage volume, and secondary regions replicate the storage pages asynchronously but with a deterministic commit order, ensuring that reads from cluster endpoints in secondary regions see all committed writes from the primary. The cluster endpoint in each region automatically load-balances across available instances and provides a single DNS name that resolves to the local reader endpoint, simplifying application configuration. In real-world scenarios, this design is critical for global applications like gaming leaderboards or financial dashboards where users expect to see their own writes immediately, regardless of geographic location.
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
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.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use Amazon Aurora Global Database with cluster endpoints in each region — Amazon Aurora Global Database is the correct choice because it provides dedicated cluster endpoints in each region that automatically route write traffic to the primary region and read traffic to local replicas, ensuring read-after-write consistency through its storage-layer replication with typical latency under 1 second. Unlike standard RDS cross-Region replication, Aurora Global Database uses a physical storage-based replication mechanism that guarantees global consistency without relying on MySQL binary logs, which can introduce replication lag and potential inconsistency.
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.
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