A government agency is developing a land registry system. They need to ensure that only authorized registrars can update property records, but citizens should be able to verify ownership without permission. Which blockchain type best fits this requirement?

Consortium blockchain with authorized writers and public read access

Private blockchain with restricted read access

Public blockchain with open access for writing

Private blockchain with open read access

A blockchain developer is explaining to a client how a transaction becomes part of the immutable ledger. Which sequence correctly describes the process?

Block is created → transaction is broadcast → nodes validate → block is added to the chain

Transaction is broadcast → nodes validate → block is created → block is added to the chain after consensus

Nodes validate → transaction is broadcast → block is created → block is added to the chain

Transaction is broadcast → block is added to the chain → nodes validate → block is created

How are blocks in a blockchain linked to form an immutable chain?

Each block contains the hash of the previous block's header.

Blocks are connected through a peer-to-peer network address.

Each block stores the full list of transactions from all previous blocks.

Blocks are linked by a shared public key.

A private blockchain network uses Proof of Authority with 5 validators. The network is experiencing downtime because one validator's node is frequently offline. What is the most effective way to improve availability?

Reduce the number of validators to 3

Increase the number of validators to 10

Replace the offline validator with a more reliable one

A developer is creating a DApp that allows users to trade digital collectibles. The smart contract must ensure that an item cannot be sold twice. Which feature of smart contracts guarantees this?

The contract is deployed on a sidechain

The contract's state is stored on-chain and updated atomically

The contract uses an off-chain database

The contract uses a random number generator

EC-CouncilBlockchain Developer Certification

Domain 1Objective 3

Blockchain Architecture, Node Infrastructure, and Types BDC Practice Questions (Page 3)

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

45questions here

9free pages

6concepts

Questions 11–15

11application · medium
A government agency is developing a land registry system. They need to ensure that only authorized registrars can update property records, but citizens should be able to verify ownership without permission. Which blockchain type best fits this requirement?
Select an answer first
12application · easy
A blockchain developer is explaining to a client how a transaction becomes part of the immutable ledger. Which sequence correctly describes the process?
Select an answer first
13foundation · easy
How are blocks in a blockchain linked to form an immutable chain?
Select an answer first
14expert · hard
A private blockchain network uses Proof of Authority with 5 validators. The network is experiencing downtime because one validator's node is frequently offline. What is the most effective way to improve availability?
Select an answer first
15expert · medium
A developer is creating a DApp that allows users to trade digital collectibles. The smart contract must ensure that an item cannot be sold twice. Which feature of smart contracts guarantees this?
Select an answer first

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