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ACE Practice Question: Designing a solution for a retail application…
This ACE practice question tests your understanding of designing a solution for a retail application…. 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.
You are designing a solution for a retail application that needs to store customer shopping cart data. The cart data is accessed frequently during active sessions and must survive for at least 30 days even without activity. Each cart entry is small (< 1 KB) and identified by a user ID. The solution must support microsecond read latency and be horizontally scalable. Which GCP storage service best meets these requirements?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Cloud Firestore in Datastore mode
Firestore provides single-digit millisecond latency, not microsecond. It also has more complexity for simple key-value cart storage.
B
Distractor review
Cloud SQL (PostgreSQL)
Cloud SQL is a relational database with millisecond latency, not designed for microsecond high-throughput key-value access at horizontal scale.
C
Distractor review
Cloud Memorystore (Redis)
Memorystore Redis provides microsecond latency but is an in-memory store; long-term 30-day persistence for all users' carts may be expensive and Memorystore is not designed for large-scale durable storage.
D
Best answer
Cloud Bigtable
Bigtable delivers sub-millisecond (microsecond range) latency for key-value reads, scales horizontally, and persists data durably — ideal for the cart use case with a user ID row key.
Common exam trap
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.
Technical deep dive
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.
Related practice questions
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Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
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Question 3
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Question 4
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Question 5
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Question 6
A startup creates its first Google Cloud project. Before deploying any paid resources, what must be linked to the project?
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FAQ
Questions learners often ask
What does this ACE question test?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Cloud Bigtable — Cloud Bigtable offers sub-millisecond (microsecond) read/write latency and horizontal scalability, making it ideal for session-like data keyed by user ID. While Memorystore (Redis) also provides microsecond latency, its persistence is limited and cost scales with data volume in memory — 30-day retention of all user carts may require significant memory. Bigtable stores data on persistent SSDs with a row key design that handles the user ID pattern naturally. Firestore has millisecond (not microsecond) latency.
What should I do if I get this ACE 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 ACE NAT questions on configuration and troubleshooting.
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This ACE practice question is part of Courseiva's free Google Cloud 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 ACE exam.