- A
Amazon RDS with transaction logging
Why wrong: RDS transaction logs can be enabled but are not tamper-proof — a DBA with sufficient access can delete or modify logs. QLDB's journal is mathematically immutable.
- B
Amazon DynamoDB with global tables
Why wrong: DynamoDB with global tables provides multi-region replication for high availability — it doesn't provide cryptographically verifiable tamper-evident audit logs.
- C
Amazon QLDB
QLDB's journal is immutable and cryptographically verifiable — every change is hash-chained so any alteration to historical records can be mathematically detected, satisfying financial regulatory requirements.
- D
AWS CloudTrail with log file integrity validation
Why wrong: CloudTrail with integrity validation records API events and detects tampering of the log files — QLDB is specifically for application-level transaction data with immutable history.
Quick Answer
Amazon QLDB is the correct choice because it is purpose-built to provide a tamper-proof audit log with cryptographic verifiability. Unlike traditional databases, QLDB uses an append-only journal where every data change is recorded as a sequential entry, and each entry is cryptographically chained to the previous one using a hash, making any past alteration instantly detectable. On the AWS Certified Cloud Practitioner CLF-C02 exam, this question tests your ability to distinguish between services for immutable storage: a common trap is confusing Amazon DynamoDB or Amazon RDS for audit logging, but those lack the built-in journal and hash chain that guarantee immutability. Remember that QLDB’s “Q” stands for “Quantum,” but the key exam takeaway is that it is a ledger database, not a blockchain—it eliminates the need for a decentralized network while still providing a verifiable, tamper-proof record. A simple memory tip: think “QLDB = Queryable Ledger Database with a Built-in Blockchain-like Journal.”
CLF-C02 Cloud Technology and Services Practice Question
This CLF-C02 practice question tests your understanding of cloud technology and services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 financial services company needs to maintain a tamper-proof audit log of all financial transactions for regulatory compliance. Which AWS service is most appropriate?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Amazon QLDB
Amazon QLDB (Quantum Ledger Database) is purpose-built to provide a cryptographically verifiable, immutable, and tamper-proof transaction log. It uses a journal that stores every change as a series of entries, and each entry is chained using a hash, making it impossible to alter or delete past records without detection. This aligns directly with the financial services requirement for an audit log that must be tamper-proof for regulatory compliance.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Amazon RDS with transaction logging
Why it's wrong here
RDS transaction logs can be enabled but are not tamper-proof — a DBA with sufficient access can delete or modify logs. QLDB's journal is mathematically immutable.
- ✗
Amazon DynamoDB with global tables
Why it's wrong here
DynamoDB with global tables provides multi-region replication for high availability — it doesn't provide cryptographically verifiable tamper-evident audit logs.
- ✓
Amazon QLDB
Why this is correct
QLDB's journal is immutable and cryptographically verifiable — every change is hash-chained so any alteration to historical records can be mathematically detected, satisfying financial regulatory requirements.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS CloudTrail with log file integrity validation
Why it's wrong here
CloudTrail with integrity validation records API events and detects tampering of the log files — QLDB is specifically for application-level transaction data with immutable history.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse AWS CloudTrail's log file integrity validation with a tamper-proof ledger, but CloudTrail is for API activity logging and does not provide the immutable, cryptographically chained journal that QLDB offers for application-level transaction records.
Detailed technical explanation
How to think about this question
Amazon QLDB uses a Merkle tree structure to cryptographically chain each journal block, ensuring that any modification to a previous entry would break the hash chain and be immediately detectable. It also provides a SQL-like query interface and supports PartiQL, making it accessible for developers while maintaining the ledger's immutability. In a real-world scenario, a financial auditor can request a digest of the journal and verify the entire history of transactions without needing to trust the database administrator.
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.
TExam Day Tips
- 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.
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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Cloud Technology and Services — This question tests Cloud Technology and Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Amazon QLDB — Amazon QLDB (Quantum Ledger Database) is purpose-built to provide a cryptographically verifiable, immutable, and tamper-proof transaction log. It uses a journal that stores every change as a series of entries, and each entry is chained using a hash, making it impossible to alter or delete past records without detection. This aligns directly with the financial services requirement for an audit log that must be tamper-proof for regulatory compliance.
What should I do if I get this CLF-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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 →
Last reviewed: Jun 11, 2026
This CLF-C02 practice question is part of Courseiva's free Amazon Web Services 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 CLF-C02 exam.
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