A global supply-chain consortium of 50 companies needs a blockchain that allows any member to read transaction data but only a subset of members (auditors) to validate transactions. They also require transaction finality in under 5 seconds and want to avoid energy-intensive mining. Which architecture best meets these requirements?

Public blockchain with Proof of Stake

Private blockchain with Proof of Work

Public blockchain with Proof of Authority

Consortium blockchain with Delegated Proof of Stake

A developer is building a decentralized application (DApp) for crowdfunding. The DApp uses a smart contract to collect funds and release them to the project creator if the funding goal is met. What is the role of the smart contract in this DApp?

To provide a user interface for the crowdfunding platform

To store the funds in a centralized bank account

To automatically enforce the funding rules and release funds when conditions are met

To mine new blocks for the blockchain

A new blockchain project wants to achieve 'instant finality' where transactions are irreversible as soon as they are included in a block. Which consensus mechanism is best suited?

Practical Byzantine Fault Tolerance (PBFT)

A DApp allows users to vote on proposals. The smart contract must prevent a user from voting twice. Which mechanism is most appropriate?

Allow the contract owner to manually remove votes

Use a random number generator to select voters

Store a mapping of voter addresses to a boolean flag

Use an off-chain database to track votes

Which of the following best describes the interaction between the peer-to-peer network layer and the consensus mechanism in a blockchain architecture?

The network layer orders transactions, and the consensus mechanism broadcasts the final block.

The network layer broadcasts transactions and blocks, while the consensus mechanism determines which block is accepted.

The network layer stores the blockchain, and the consensus mechanism encrypts the data.

The consensus mechanism creates the network topology, and the network layer validates transactions.

EC-CouncilBlockchain Developer Certification

Domain 1Objective 3

Blockchain Architecture, Node Infrastructure, and Types BDC Practice Questions (Page 9)

Part of the Blockchain Fundamentals and Architecture domain, which makes up ~14% of our current practice bank.

45questions here

9free pages

6concepts

Questions 41–45

41expert · hard
A global supply-chain consortium of 50 companies needs a blockchain that allows any member to read transaction data but only a subset of members (auditors) to validate transactions. They also require transaction finality in under 5 seconds and want to avoid energy-intensive mining. Which architecture best meets these requirements?
Select an answer first
42application · easy
A developer is building a decentralized application (DApp) for crowdfunding. The DApp uses a smart contract to collect funds and release them to the project creator if the funding goal is met. What is the role of the smart contract in this DApp?
Select an answer first
43expert · hard
A new blockchain project wants to achieve 'instant finality' where transactions are irreversible as soon as they are included in a block. Which consensus mechanism is best suited?
Select an answer first
44expert · medium
A DApp allows users to vote on proposals. The smart contract must prevent a user from voting twice. Which mechanism is most appropriate?
Select an answer first
45foundation · easy
Which of the following best describes the interaction between the peer-to-peer network layer and the consensus mechanism in a blockchain architecture?
Select an answer first

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