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GCDL Practice Question: A web application's homepage loads user-specific…
This GCDL practice question tests your understanding of a web application's homepage loads user-specific…. 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 web application's homepage loads user-specific data (shopping cart, recent orders) on every visit. The data changes frequently. An engineer suggests caching this data in a Redis cache between the web tier and the database. What is the primary benefit of this caching layer?
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
Caching encrypts data in transit between the web tier and database.
Caching is a performance optimization (storing data in fast memory). Encryption in transit is handled by TLS — a separate concern.
B
Best answer
Caching reduces database load and improves response times by serving frequently accessed data from fast in-memory storage.
Redis/Memorystore serves cache hits in microseconds vs. database queries in milliseconds. Fewer DB queries = lower DB load, faster responses, and ability to handle more concurrent users.
C
Distractor review
Caching permanently stores user data so the database can be deleted.
Caches are temporary stores that are periodically invalidated or expired. The database remains the durable source of truth; the cache is a performance layer in front of it.
D
Distractor review
Caching automatically synchronizes data between multiple database replicas.
Database replication synchronizes data between replicas — a separate mechanism. Caching is about fast read access to frequently accessed data, not database synchronization.
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.
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More questions from this exam
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Question 1
A traditional retailer currently maintains its own data centers, purchasing servers every 3–5 years and paying for facilities, power, and staff regardless of demand. When it migrates its workloads to the public cloud, which change in cost model does it experience?
Question 2
An e-commerce company plans its infrastructure for peak shopping events (e.g., Black Friday) which drive 50× normal traffic. On-premises, they must maintain 50× capacity year-round. In the cloud, they provision 50× capacity only during peak periods. Which cloud characteristic enables this cost optimization?
Question 3
Which term describes the process by which organizations integrate digital technology into all areas of their business, fundamentally changing how they operate and deliver value to customers?
Question 4
When a company moves from maintaining its own data center to using Google Cloud, which operational responsibility does Google assume that the company previously managed?
Question 5
A hospital runs a patient records system that must remain on-premises due to strict regulatory data residency requirements. However, they also want to use cloud-based AI for diagnostic imaging analysis. Which cloud deployment model best describes their architecture?
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: Caching reduces database load and improves response times by serving frequently accessed data from fast in-memory storage. — Caching stores frequently accessed data in a fast, in-memory store (Redis/Memorystore). Subsequent requests for the same data are served from cache at microsecond latency instead of querying the database (milliseconds to seconds). This reduces database load (fewer queries), improves response time for users, and allows the system to handle more concurrent users without scaling the database. The tradeoff is cache staleness — cached data may not reflect the very latest database state.
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.