CLF-C02 Cloud Technology and Services Practice Question

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 DynamoDB

  Why it's wrong here

  Amazon DynamoDB is a serverless, multi-region NoSQL key-value and document database designed for single-digit-millisecond performance at any scale. While it now supports ACID transactions and can persist records of financial events, it is a centralized service with no peer-to-peer consensus or built-in cryptographic hash chain verifying the integrity of every entry. Storing transaction data in DynamoDB does not make it a blockchain service, because there is no distributed trust or immutable append-only log enforced by design.

• ✗

  AWS Quantum Ledger Database (QLDB)

  Why it's wrong here

  AWS Quantum Ledger Database (QLDB) provides a centralized, immutable, append-only journal that uses a cryptographic hash chain to make every change transparent and verifiable. However, the ledger's trust model is based on a single AWS account and region, with no distributed voting among untrusted participants, so it does not qualify as a blockchain. It is a ledger database, not a decentralized blockchain service, and is typically chosen when a central authority needs cryptographically verifiable history without the overhead of a full blockchain network.

• ✓

  Amazon Managed Blockchain

  Why this is correct

  Amazon Managed Blockchain is a fully managed service that lets you create and operate blockchain networks using either Hyperledger Fabric or Ethereum. It automates the provisioning of peer nodes, ordering services, certificate management, and membership policies, while still preserving the decentralized, multi-party consensus model that defines a blockchain. Because it provides the infrastructure for actual blockchain networks and supports multiple organizations voting and transacting without a central administrator, it is the correct answer.

• ✗

  Amazon Neptune

  Why it's wrong here

  Amazon Neptune is a fully managed graph database optimized for traversing highly connected datasets such as social graphs, fraud detection, and knowledge graphs. It supports query languages like Gremlin and SPARQL, but it stores relational-style graph data and has no concept of a distributed ledger, consensus, or cryptographic chaining. Therefore, Neptune cannot provide the decentralized, tamper-evident transaction history that blockchain use cases require.

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