CBSA - Certified Blockchain Solution Architect Blockchain Network Architectures Questions and Answers — Questions and Answers
Question 1: A financial consortium of several competing banks wants to build a shared ledger for inter-bank settlements. They require high transaction throughput, data privacy for their respective clients, and a governance model where no single bank has ultimate control. Which blockchain network architecture is most suitable for this scenario?
- Public Blockchain
- Private Blockchain
- Consortium Blockchain (Correct answer)
- Hybrid Blockchain
Correct answer: Consortium Blockchain
A consortium blockchain is the ideal choice because it is governed by a group of organizations rather than a single entity or being open to the public. This architecture provides the required balance of shared control, high performance, and privacy needed for collaboration between competing entities like banks. A public blockchain would lack the necessary privacy and performance. A private blockchain would be controlled by a single bank, which is not acceptable to the consortium. A hybrid model might be overly complex for this specific use case of a shared settlement ledger.
Question 2: A startup is developing a decentralized application (dApp) for supply chain management that needs to be accessible to a wide range of participants, from large manufacturers to small, individual farmers. The core requirements are maximum transparency, censorship resistance, and data integrity that can be verified by any participant. Which network architecture should the solution architect recommend?
- Private Blockchain
- Public Blockchain (Correct answer)
- Consortium Blockchain
- Centralized Database
Correct answer: Public Blockchain
A public blockchain is the most appropriate architecture for this use case. Its permissionless nature allows anyone to join and participate, ensuring the wide accessibility needed. The inherent transparency and decentralization of public blockchains provide the required censorship resistance and publicly verifiable data integrity. Private and consortium blockchains limit participation, which contradicts the requirement for open access. A centralized database would not provide the decentralized trust and immutability that is a core benefit of blockchain for this scenario.
Question 3: Which of the following is a primary trade-off when choosing a private blockchain architecture over a public one?
- Decreased transaction speed for increased decentralization.
- Increased decentralization at the cost of lower security.
- Enhanced privacy and performance at the cost of decentralization. (Correct answer)
- Lower operational costs for increased network transparency.
Correct answer: Enhanced privacy and performance at the cost of decentralization.
Private blockchains sacrifice decentralization to gain control, which leads to enhanced privacy and performance. Because the participants are known and trusted, more efficient consensus mechanisms can be used, resulting in faster transaction speeds compared to public blockchains. Public blockchains, on the other hand, prioritize decentralization and security over performance.
Question 4: A large enterprise wants to use blockchain to streamline its internal auditing processes. The system will handle sensitive financial data, access must be strictly controlled, and the company must have the ability to modify rules if necessary. Performance and scalability are critical. Which architecture is the best fit?
- Consortium Blockchain
- Hybrid Blockchain
- Public Blockchain
- Private Blockchain (Correct answer)
Correct answer: Private Blockchain
A private blockchain is the best fit for this internal enterprise use case. It is controlled by a single organization, allowing for strict access control and the ability to manage the rule set. This centralized control enables high performance and scalability, which are critical requirements. Data privacy is also a key feature, protecting the sensitive financial information. A consortium is for multiple organizations, a public blockchain is too open and slow, and a hybrid model is unnecessarily complex for a purely internal system.
Question 5: A healthcare provider plans to build a system for managing patient records. They want to store sensitive patient data on a permissioned network with restricted access for security and compliance. However, they also want to allow researchers to access anonymized data subsets for studies through a publicly verifiable system. What architecture would a solution architect most likely recommend?
- A single, highly secure Private Blockchain
- A Public Blockchain with zero-knowledge proofs
- A Hybrid Blockchain (Correct answer)
- A Consortium Blockchain governed by hospitals
Correct answer: A Hybrid Blockchain
A hybrid blockchain architecture is the most suitable solution. It combines a private, permissioned blockchain for securely managing sensitive patient records with controlled access, and a public blockchain for transparency and public verifiability of anonymized data. This allows the organization to leverage the benefits of both worlds: the privacy and control of a private chain and the trust and transparency of a public one.
Question 6: When designing a blockchain solution, a key architectural consideration is the 'Blockchain Trilemma,' which involves a trade-off between which three properties?
- Speed, Cost, and Storage
- Decentralization, Scalability, and Security (Correct answer)
- Privacy, Transparency, and Immutability
- Nodes, Smart Contracts, and Consensus
Correct answer: Decentralization, Scalability, and Security
The 'Blockchain Trilemma' refers to the challenge that blockchain systems face in trying to optimize for three key properties simultaneously: decentralization, scalability, and security. Typically, a design choice that enhances one or two of these aspects comes at the expense of the third. For example, increasing decentralization (more nodes) can negatively impact scalability (slower transaction throughput).
CBSA - Certified Blockchain Solution Architect Blockchain Network Architectures Questions and Answers
A financial consortium of several competing banks wants to build a shared ledger for inter-bank settlements.
They require high transaction throughput, data privacy for their respective clients, and a governance model where no single bank has ultimate control.
Which blockchain network architecture is most suitable for this scenario?