A developer is designing a blockchain-based voting system. They want to ensure that once a vote is cast, it cannot be altered, and that all votes are visible to auditors. Which architectural feature is essential to achieve this?

Using a hash chain where each block references the previous block's hash

Encrypting votes with a symmetric key shared among all voters

Using a centralized database to store votes

Storing votes in a distributed file system without linking

A consortium of five banks wants to share a blockchain for interbank settlements. They require transaction finality in seconds, known participants, and the ability to restrict who can read transaction data. Which blockchain type and consensus mechanism best meets these requirements?

Consortium blockchain with Proof of Work

Public blockchain with Proof of Work

Public blockchain with Proof of Stake

Private blockchain with Proof of Authority

What is the primary role of a light node in a blockchain network?

To mine new blocks by solving computational puzzles

To verify transactions using block headers and request additional data from full nodes

To serve as the only entry point for new nodes joining the network

To store the full blockchain and participate in consensus

A company is evaluating blockchain platforms for a cross-organizational workflow where multiple competing companies must share data but not reveal sensitive information to each other. They require a tamper-proof audit trail. Which architecture is most appropriate?

Public blockchain with off-chain storage

Public blockchain with public smart contracts

Private blockchain with a single organization controlling all nodes

Consortium blockchain with private transactions or channels

EC-CouncilBlockchain Developer Certification

Domain 1Objective 3

Blockchain Architecture, Node Infrastructure, and Types BDC Practice Questions (Page 5)

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

45questions here

9free pages

6concepts

Questions 21–25

21expert · medium
A blockchain startup is designing a network where mobile devices will participate but have limited storage and bandwidth. They still need to verify that their transactions are included in blocks. Which node type should the mobile devices run?
Select an answer first
22application · medium
A developer is designing a blockchain-based voting system. They want to ensure that once a vote is cast, it cannot be altered, and that all votes are visible to auditors. Which architectural feature is essential to achieve this?
Select an answer first
23application · medium
A consortium of five banks wants to share a blockchain for interbank settlements. They require transaction finality in seconds, known participants, and the ability to restrict who can read transaction data. Which blockchain type and consensus mechanism best meets these requirements?
Select an answer first
24foundation · easy
What is the primary role of a light node in a blockchain network?
Select an answer first
25expert · hard
A company is evaluating blockchain platforms for a cross-organizational workflow where multiple competing companies must share data but not reveal sensitive information to each other. They require a tamper-proof audit trail. Which architecture is most appropriate?
Select an answer first

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