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GCDL Practice Question: A startup is building a gaming application where…
This GCDL practice question tests your understanding of a startup is building a gaming application where…. 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 startup is building a gaming application where players must see each other's moves in real time. The database storing game state must guarantee that all players see the same state simultaneously. Which consistency requirement does this impose and why does it matter for database selection?
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
Eventual consistency is sufficient; the game can show slightly stale state to some players without impact on gameplay
In a real-time multiplayer game, showing different states to different players simultaneously creates game-breaking inconsistencies: players acting on different views of game state leads to conflicting outcomes. Strong consistency is required.
B
Best answer
Strong consistency is required so all players simultaneously read the same current game state; eventual consistency would create conflicting game states visible to different players
This is correct. Strong consistency guarantees that after a write (player moves), all subsequent reads from any client see that write. This ensures all players operate on the same view of game state. Cloud Spanner's external consistency or Firestore's strongly consistent reads serve this requirement.
C
Distractor review
Consistency doesn't matter for gaming databases because games update state so frequently that any inconsistency resolves within milliseconds
Milliseconds of inconsistency in a real-time game means players are seeing and acting on different realities simultaneously. At game speeds, even sub-second inconsistency creates serious problems.
D
Distractor review
The game should avoid databases entirely and use local storage on each player's device to ensure fast, consistent state access
Local storage per device creates the worst consistency problem — each device maintains its own state with no coordination. Real-time multiplayer requires a shared authoritative source of truth.
Common exam trap
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Technical deep dive
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
Related practice questions
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More questions from this exam
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Question 2
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Question 3
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Question 4
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Question 5
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Question 6
What is virtualization in the context of cloud computing, and why is it fundamental to how cloud providers deliver services?
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FAQ
Questions learners often ask
What does this GCDL question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Strong consistency is required so all players simultaneously read the same current game state; eventual consistency would create conflicting game states visible to different players — Real-time multiplayer games require strong consistency (also called linearizability) — all players must read the same current state. Eventual consistency would allow different players to see different game states temporarily, creating unfair or nonsensical game experiences (one player sees a monster as alive while another sees it as dead). Strongly consistent databases (Cloud Spanner, with its external consistency) or strongly consistent reads in Firestore are appropriate choices.
What should I do if I get this GCDL question wrong?
Identify which GCDL exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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This GCDL 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 GCDL exam.