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GCDL Practice Question: A retail company needs to process financial…
This GCDL practice question tests your understanding of a retail company needs to process financial…. 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 retail company needs to process financial transactions requiring strict ACID compliance, serve global customers with consistent low-latency reads and writes, and scale horizontally without downtime for maintenance. Which Google Cloud database service is uniquely designed to meet all three requirements simultaneously?
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
Firestore in Datastore mode with multi-region replication
Firestore is a NoSQL document database that provides eventual or strong consistency per-document but not ACID transactions across multiple document types. It is not suitable for complex relational financial transaction processing.
B
Distractor review
BigQuery with streaming inserts for real-time transaction processing
BigQuery is an analytical data warehouse, not a transactional database. It does not provide ACID transaction support for the type of concurrent read-write financial transaction processing described.
C
Distractor review
Cloud SQL with read replicas in multiple regions
Cloud SQL with read replicas provides read scaling but writes remain single-region. Global write consistency across regions requires manual application-level sharding, complex failover, and introduces latency inconsistencies. Cloud SQL does not natively provide globally consistent low-latency writes.
D
Best answer
Cloud Spanner, Google's globally distributed relational database with ACID transactions and horizontal scalability
Cloud Spanner uniquely satisfies all three requirements: full ACID compliance for financial transactions, global distribution with strong consistency for low-latency global reads and writes, and horizontal scaling without downtime. It was purpose-built by Google for exactly this class of globally consistent, highly available transactional workloads.
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 GCDL practice-question pages
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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?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Cloud Spanner, Google's globally distributed relational database with ACID transactions and horizontal scalability — Cloud Spanner is Google's globally distributed relational database that provides ACID transactions, SQL support, and horizontal scalability simultaneously — a combination that was theoretically considered impossible (CAP theorem) before Spanner. It is the only service that offers both relational consistency and global horizontal scalability. No other single service in Google Cloud (or any other cloud) matches all three requirements natively.
What should I do if I get this GCDL 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 GCDL NAT questions on configuration and troubleshooting.
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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.