CBSA Solution Architecture Design 4

Question 1

An architect is designing a DeFi protocol and needs to prevent flash loan attacks. Which architectural safeguard is most effective?

Accepted Answer

Using time-weighted average prices (TWAP) instead of spot prices

Answer

TWAP oracles average prices over multiple blocks, making them resistant to flash loan price manipulation that occurs within a single atomic transaction.

Question 2

A blockchain architect is designing a solution where nodes must validate transactions without accessing their full content. Which cryptographic primitive enables this?

Accepted Answer

Zero-knowledge proofs

Answer

Zero-knowledge proofs allow a prover to convince a verifier that a statement is true (e.g., a transaction is valid) without revealing the underlying data.

Question 3

When designing a blockchain network for a regulated industry, which node architecture model best balances decentralization with compliance requirements?

Accepted Answer

Permissioned nodes with KYC-verified operators

Answer

Permissioned networks with KYC-verified node operators satisfy regulatory requirements for known counterparties while maintaining distributed control across multiple organizations.

Question 4

In a blockchain solution architecture, what is the primary role of an event-driven architecture pattern using smart contract events?

Accepted Answer

Enabling off-chain systems to react to on-chain state changes in real time

Answer

Smart contract events emit logs that off-chain systems can subscribe to, enabling real-time integration between blockchain state changes and traditional application systems.

Question 5

A solution architect must ensure that a blockchain smart contract correctly handles reentrancy attacks. Which design pattern directly mitigates this vulnerability?

Accepted Answer

Checks-Effects-Interactions pattern with mutex guards

Answer

The Checks-Effects-Interactions pattern ensures state is updated before making external calls, and mutex guards prevent reentrant calls from executing while a function is in progress.

(CBSA) Certified Blockchain Solution Architect Practice Test

(CBSA) Certified Blockchain Solution Architect Practice Test

CBSA Solution Architecture Design 4