A multinational corporation wants to create a blockchain for internal audit trails. They require that only approved employees can submit transactions, but they also want to prove to external regulators that the data has not been tampered with. They are considering a private blockchain with a proof-of-authority (PoA) consensus. What is the main trade-off they must accept?

Inability to provide cryptographic proof of integrity to regulators

Reduced decentralization and reliance on trusted validators

Higher energy consumption than proof-of-work

Lower throughput compared to public blockchains

A startup is deploying a private Ethereum network for internal supply-chain tracking. They need to minimize storage overhead on participant machines while still allowing each participant to independently verify that a transaction was included in a block. Which node configuration should they use?

Run full nodes on all participant machines

Run light nodes on participant machines and full nodes on a few trusted servers

Run miner nodes on all participant machines

Run archive nodes on participant machines

A blockchain network is experiencing frequent orphaned blocks. The development team suspects the issue is related to block propagation time. Which change is most likely to reduce orphaned blocks?

Increase the difficulty of the consensus algorithm

Decrease the block time interval

Reduce the block propagation time by optimizing network topology

A developer is designing a blockchain network for a logistics company. They need to ensure that every participant can independently verify the integrity of the entire transaction history without trusting a central authority. Which architectural component is essential?

A cloud storage service for off-chain data

A distributed ledger replicated across all full nodes

A single authoritative node that validates all transactions

A centralized database with a backup server

A company wants to deploy a decentralized application (DApp) that automates royalty payments to musicians every time a song is streamed. The logic must be transparent and run identically on all nodes. Which component should they implement?

A smart contract on the blockchain

A sidechain with a custom consensus

EC-CouncilBlockchain Developer Certification

Domain 1Objective 3

Blockchain Architecture, Node Infrastructure, and Types BDC Practice Questions (Page 1)

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

45questions here

9free pages

6concepts

Questions 1–5

1expert · hard
A multinational corporation wants to create a blockchain for internal audit trails. They require that only approved employees can submit transactions, but they also want to prove to external regulators that the data has not been tampered with. They are considering a private blockchain with a proof-of-authority (PoA) consensus. What is the main trade-off they must accept?
Select an answer first
2application · medium
A startup is deploying a private Ethereum network for internal supply-chain tracking. They need to minimize storage overhead on participant machines while still allowing each participant to independently verify that a transaction was included in a block. Which node configuration should they use?
Select an answer first
3expert · hard
A blockchain network is experiencing frequent orphaned blocks. The development team suspects the issue is related to block propagation time. Which change is most likely to reduce orphaned blocks?
Select an answer first
4application · medium
A developer is designing a blockchain network for a logistics company. They need to ensure that every participant can independently verify the integrity of the entire transaction history without trusting a central authority. Which architectural component is essential?
Select an answer first
5application · medium
A company wants to deploy a decentralized application (DApp) that automates royalty payments to musicians every time a song is streamed. The logic must be transparent and run identically on all nodes. Which component should they implement?
Select an answer first

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