In Proof of Work (PoW), how is a new block added to the blockchain?

A group of delegates elected by token holders votes to approve the block

A miner solves a computationally difficult puzzle and the first to solve it proposes the block

A central authority signs and broadcasts the block to all nodes

A validator is randomly selected based on the amount of cryptocurrency they hold

In Delegated Proof of Stake (DPoS), who is responsible for producing and validating blocks?

Miners who solve computational puzzles

A small set of delegates elected by token holders

A central authority appointed by the founding team

All token holders equally, regardless of stake

A private enterprise blockchain for supply chain tracking needs a consensus mechanism that is energy-efficient, does not require token staking, and can tolerate a small number of known validators. The validators are all trusted partner companies. Which consensus mechanism is the best fit?

Delegated Proof of Stake (DPoS)

In Proof of Authority (PoA), what determines who can validate transactions?

The identity and reputation of the validator, who is pre-approved

The amount of cryptocurrency staked by the validator

The computational power of the validator's hardware

The number of tokens held by the validator

EC-CouncilBlockchain Business Leader Certification

Domain 3Objective 1

Blockchain Consensus Mechanisms and Their Applications BBLC Practice Questions (Page 1)

Part of the Consensus, Cryptomining, and Token Economics domain, which makes up ~13% of our current practice bank.

62questions here

13free pages

17concepts

17 Concepts in This Objective

Definition of Consensus
Properties of Consensus Mechanisms
Proof of Work (PoW)
Proof of Stake (PoS)
Delegated Proof of Stake (DPoS)
Practical Byzantine Fault Tolerance (PBFT)
Other Consensus Mechanisms
Consensus Mechanism Selection Criteria
Cryptomining Fundamentals
Mining Hardware and Software
Mining Pools
Mining Rewards and Incentives
Token Economics Fundamentals
Token Supply and Distribution
Token Valuation and Utility
Economic Security and Game Theory
Applications of Consensus and Token Economics

Questions 1–5

1foundation · easy
In Proof of Work (PoW), how is a new block added to the blockchain?
Select an answer first
2foundation · easy
In Delegated Proof of Stake (DPoS), who is responsible for producing and validating blocks?
Select an answer first
3application · medium
A private enterprise blockchain for supply chain tracking needs a consensus mechanism that is energy-efficient, does not require token staking, and can tolerate a small number of known validators. The validators are all trusted partner companies. Which consensus mechanism is the best fit?
Select an answer first
4foundation · easy
In Proof of Authority (PoA), what determines who can validate transactions?
Select an answer first
5application · medium
A blockchain network uses a PoS consensus mechanism. To ensure that validators act honestly, the protocol slashes (confiscates) a portion of a validator's stake if they propose conflicting blocks. What game-theoretic property does this mechanism primarily reinforce?
Select an answer first

Finished these 5 questions?

Review the revealed explanations, or continue through the curriculum.

Next 5 questions →Back to BBLC

Free Basic Practice is a study aid with revealable answers — not a scored exam. Examers.io is independent and not affiliated with or endorsed by EC-Council. “BBLC” is a trademark of its owner, used for identification only.