The answer is Amazon ElastiCache for Redis Global Datastore, because it provides sub-millisecond read latency with cross-Region replication, making it the ideal multi-region low-latency shared data store for frequently updated datasets. Redis Global Datastore uses active-passive replication across AWS Regions, allowing you to scale reads locally while maintaining strong consistency for writes from a primary Region. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of latency-sensitive architectures and the trade-offs between consistency and speed—a common trap is choosing DynamoDB global tables for its eventual consistency or Aurora Global Database for its 1-second replication lag, both of which fail the sub-millisecond requirement. Remember the memory tip: "Redis Reads in a Red-Hot Rush" — if the need is for the fastest possible reads across Regions, Redis Global Datastore is the only service that delivers sub-millisecond performance with cross-Region consistency.
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 global company is deploying a multi-Region application on AWS. The application requires low-latency access to a shared dataset that is updated frequently in multiple Regions. The company wants to use Amazon Route 53 latency-based routing to direct users to the closest Region. Which data store provides the best combination of low-latency reads and cross-Region consistency for this use case?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Amazon ElastiCache for Redis Global Datastore
Option C is correct because Amazon ElastiCache for Redis offers sub-millisecond latency and can be used as a global datastore with cross-Region replication using Global Datastore. Option A is incorrect because DynamoDB global tables offer eventual consistency, but with higher latency for strongly consistent reads. Option B is incorrect because S3 is object storage and not suitable for frequently updated shared dataset requires sub-millisecond latency. Option D is incorrect because Aurora Global Database provides low-latency reads but with a lag of typically 1 second, not sub-millisecond.
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.
✗
Amazon S3 with cross-Region replication
Why it's wrong here
S3 is not suitable for sub-millisecond latency.
✗
Amazon Aurora Global Database
Why it's wrong here
Aurora Global Database has a replication lag of about 1 second.
✓
Amazon ElastiCache for Redis Global Datastore
Why this is correct
Redis Global Datastore provides sub-millisecond reads and cross-Region replication.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Amazon DynamoDB global tables with eventually consistent reads
Why it's wrong here
Eventually consistent reads have higher latency than Redis.
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 ANS-C01 NAT questions on configuration and troubleshooting.
Network Design — This question tests Network Design — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Amazon ElastiCache for Redis Global Datastore — Option C is correct because Amazon ElastiCache for Redis offers sub-millisecond latency and can be used as a global datastore with cross-Region replication using Global Datastore. Option A is incorrect because DynamoDB global tables offer eventual consistency, but with higher latency for strongly consistent reads. Option B is incorrect because S3 is object storage and not suitable for frequently updated shared dataset requires sub-millisecond latency. Option D is incorrect because Aurora Global Database provides low-latency reads but with a lag of typically 1 second, not sub-millisecond.
What should I do if I get this ANS-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 ANS-C01 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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