Quiz: Blockchain Consensus Mechanisms

Question 1: What is the primary role of consensus mechanisms in blockchain networks?

A. To enable trustless coordination among distributed participants B. To increase transaction fees C. To centralize control of the network D. To slow down transaction processing

Question 2: Which consensus mechanism involves miners solving complex mathematical puzzles to validate transactions?

A. Proof of Stake (PoS) B. Proof of Work (PoW) C. Delegated Proof of Stake (DPoS) D. Practical Byzantine Fault Tolerance (PBFT)

Question 3: What is a significant drawback of Proof of Work (PoW) consensus mechanisms?

A. Low energy consumption B. Centralization of power C. High energy consumption D. Lack of security

Question 4: In Proof of Stake (PoS), how is the creator of a new block selected?

A. Based on computational power B. Random selection weighted by the amount of cryptocurrency they hold and are willing to "stake" C. By solving mathematical puzzles D. Through a voting process

Question 5: Which consensus mechanism is known for its energy efficiency compared to Proof of Work?

A. Proof of Burn B. Proof of Authority C. Proof of Stake (PoS) D. Proof of Elapsed Time

Question 6: What is Delegated Proof of Stake (DPoS)?

A. A combination of PoW and PoS B. A mechanism where validators are selected based on their identity C. A variant of PoS where stakeholders vote for a small number of delegates to validate transactions and create blocks D. A system where nodes are selected randomly to create blocks

Question 7: Which consensus mechanism uses a rotating leadership system to achieve consensus?

A. Proof of Work (PoW) B. Proof of Stake (PoS) C. Delegated Proof of Stake (DPoS) D. Practical Byzantine Fault Tolerance (PBFT)

Question 8: What is a key advantage of Practical Byzantine Fault Tolerance (PBFT)?

A. High scalability B. Tolerance to a high number of malicious nodes C. Simplified implementation D. Low energy consumption

Question 9: Which consensus mechanism is employed by the Ripple network?

A. Ripple Protocol Consensus Algorithm (RPCA) B. Proof of Work (PoW) C. Proof of Stake (PoS) D. Delegated Proof of Stake (DPoS)

Question 10: In Proof of Authority (PoA), how are validators selected?

A. Based on their computational power B. Through a voting process C. Based on their reputation and identity D. Randomly

Question 11: What is a common criticism of Proof of Authority (PoA)?

A. High energy consumption B. Centralization of power C. Lack of security D. Complex implementation

Question 12: Which consensus mechanism involves validators locking up a portion of their cryptocurrency as collateral?

A. Proof of Work (PoW) B. Proof of Burn C. Proof of Authority (PoA) D. Proof of Stake (PoS)