A group of five banks wants to share a distributed ledger for interbank settlements. They need fast finality, know each other's identities, and want to avoid the energy costs of proof-of-work. Which blockchain type and consensus mechanism should they choose?

Consortium blockchain with proof-of-work

Public blockchain with proof-of-stake

Private blockchain with practical Byzantine fault tolerance (PBFT)

Public blockchain with proof-of-authority

A developer is building a DApp that relies on a smart contract to manage digital identity. The smart contract stores a hash of each user's personal data on-chain, while the actual data is stored off-chain. What is the primary benefit of this architecture?

It reduces the cost of storing large data on-chain

It eliminates the need for encryption

It allows the smart contract to access the personal data directly

It makes the personal data immutable

A developer is designing a blockchain for a voting system. They need to ensure that votes are immutable and that the system remains available even if some nodes fail. Which architectural approach best meets these requirements?

A single full node with a backup database

A network of full nodes with consensus

A centralized server with a public API

A government agency wants to issue digital credentials to citizens. They need a blockchain that is publicly verifiable but only the agency can write new credentials. Which setup best fits?

Consortium blockchain with public read access

Public blockchain with open write access

Private blockchain with open read access

Public blockchain with permissioned write access

In a Proof of Work (PoW) consensus mechanism, what is the primary purpose of requiring miners to solve a computationally difficult puzzle?

To allow any node to propose a block without verification

To encrypt the transactions in the block

To make it costly to propose a new block, deterring spam and attacks

EC-CouncilBlockchain Developer Certification

Domain 1Objective 3

Blockchain Architecture, Node Infrastructure, and Types BDC Practice Questions (Page 2)

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

45questions here

9free pages

6concepts

Questions 6–10

6application · medium
A group of five banks wants to share a distributed ledger for interbank settlements. They need fast finality, know each other's identities, and want to avoid the energy costs of proof-of-work. Which blockchain type and consensus mechanism should they choose?
Select an answer first
7expert · hard
A developer is building a DApp that relies on a smart contract to manage digital identity. The smart contract stores a hash of each user's personal data on-chain, while the actual data is stored off-chain. What is the primary benefit of this architecture?
Select an answer first
8expert · medium
A developer is designing a blockchain for a voting system. They need to ensure that votes are immutable and that the system remains available even if some nodes fail. Which architectural approach best meets these requirements?
Select an answer first
9application · medium
A government agency wants to issue digital credentials to citizens. They need a blockchain that is publicly verifiable but only the agency can write new credentials. Which setup best fits?
Select an answer first
10foundation · easy
In a Proof of Work (PoW) consensus mechanism, what is the primary purpose of requiring miners to solve a computationally difficult puzzle?
Select an answer first

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