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ACE Practice Question: A team is building a real-time multiplayer game…
This ACE practice question tests your understanding of a team is building a real-time multiplayer game…. 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 team is building a real-time multiplayer game backend requiring low-latency state synchronization between players worldwide. Session data must persist for the duration of a game (up to 2 hours) but doesn't need long-term storage. Which managed service best fits?
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
Best answer
Cloud Memorystore for Redis
Memorystore provides sub-millisecond in-memory storage with built-in TTL support for expiring game sessions — ideal for real-time, ephemeral state.
B
Distractor review
Cloud Bigtable
Bigtable handles massive analytics workloads efficiently, but its latency (~single-digit milliseconds) and operational model are not optimized for transient session-state patterns.
C
Distractor review
Cloud Firestore in Native mode
Firestore is a persistent document database — it's not designed for sub-millisecond in-memory caching of ephemeral session state.
D
Distractor review
Cloud SQL for PostgreSQL with connection pooling
Cloud SQL is a relational database — its latency (milliseconds to tens of milliseconds) is too high for real-time game state synchronization.
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
Related ACE practice-question pages
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.
Question 1
What is the correct order of the Google Cloud resource hierarchy from highest to lowest level?
Question 2
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Question 3
Which gcloud command creates a Compute Engine VM named 'web-01' using the e2-medium machine type in zone us-central1-a?
Question 4
A team wants to receive an email alert when the average CPU utilization of VMs in a managed instance group exceeds 80% for more than 5 minutes. What should they create in Cloud Monitoring?
Question 5
A junior developer needs read-only access to all GCP resources in a project. Which IAM role grants the minimum permissions required?
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 Memorystore for Redis — Cloud Memorystore for Redis provides managed, sub-millisecond latency in-memory data storage — ideal for real-time session state that is read and written frequently. Data automatically expires with TTL settings. Cloud SQL adds relational overhead unsuitable for sub-millisecond requirements. Firestore has higher latency than in-memory caches.
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.