Google PCA Practice Question: Designing and Planning a Cloud Solution Architecture
This PCA practice question tests your understanding of designing and planning a cloud solution architecture. 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 company is migrating an on-premises Oracle database to Google Cloud. They want to minimize application changes and need a fully managed, PostgreSQL-compatible database with high performance for OLTP workloads. Which service is MOST suitable?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Why wrong: Bigtable is NoSQL and not compatible with SQL or Oracle applications.
B
AlloyDB
AlloyDB is PostgreSQL-compatible, fully managed, and offers 4x faster transaction processing than standard PostgreSQL, making it ideal for Oracle migrations.
C
Cloud SQL for PostgreSQL
Why wrong: Cloud SQL is managed but lacks AlloyDB's performance optimizations for Oracle migrations.
D
Cloud Spanner
Why wrong: Spanner is globally distributed and SQL-compatible but may require schema changes and is overkill for a single-region OLTP workload.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
AlloyDB
AlloyDB is a fully managed, PostgreSQL-compatible database optimized for high-performance OLTP workloads, designed for migration from Oracle with minimal changes. Cloud SQL for PostgreSQL is also managed but does not offer the same performance optimizations as AlloyDB. Cloud Spanner is global and SQL-compatible but may require application changes. Bigtable is NoSQL.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Bigtable
Why it's wrong here
Bigtable is NoSQL and not compatible with SQL or Oracle applications.
✓
AlloyDB
Why this is correct
AlloyDB is PostgreSQL-compatible, fully managed, and offers 4x faster transaction processing than standard PostgreSQL, making it ideal for Oracle migrations.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Cloud SQL for PostgreSQL
Why it's wrong here
Cloud SQL is managed but lacks AlloyDB's performance optimizations for Oracle migrations.
✗
Cloud Spanner
Why it's wrong here
Spanner is globally distributed and SQL-compatible but may require schema changes and is overkill for a single-region OLTP workload.
Common exam traps
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.
Detailed technical explanation
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.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
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 PCA NAT questions on configuration and troubleshooting.
Designing and Planning a Cloud Solution Architecture — This question tests Designing and Planning a Cloud Solution Architecture — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: AlloyDB — AlloyDB is a fully managed, PostgreSQL-compatible database optimized for high-performance OLTP workloads, designed for migration from Oracle with minimal changes. Cloud SQL for PostgreSQL is also managed but does not offer the same performance optimizations as AlloyDB. Cloud Spanner is global and SQL-compatible but may require application changes. Bigtable is NoSQL.
What should I do if I get this PCA 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 PCA NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This PCA 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 PCA exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.