Blockchain 101 Certification Blockchain 101 Certification Consensus Mechanisms & Protocols 1

Question 1

Which consensus mechanism requires participants to solve computationally intensive puzzles to validate transactions?

Accepted Answer

Proof of Work

Answer

Proof of Work (PoW) requires miners to expend computational energy solving cryptographic puzzles to add blocks to the chain.

Question 2

In a Proof of Stake consensus model, what determines a validator's chance of being selected to create the next block?

Accepted Answer

Amount of staked cryptocurrency

Answer

In PoS, validators are chosen to propose new blocks proportionally based on the amount of cryptocurrency they have staked as collateral.

Question 3

What is a Byzantine Fault in the context of distributed blockchain consensus?

Accepted Answer

Arbitrary or malicious behavior by a node

Answer

A Byzantine Fault refers to a node behaving arbitrarily or maliciously, sending conflicting information to different parts of the network.

Question 4

Which consensus protocol is commonly used in permissioned enterprise blockchains like Hyperledger Fabric?

Accepted Answer

Practical Byzantine Fault Tolerance (PBFT)

Answer

PBFT is widely used in permissioned blockchains because it achieves consensus among known, trusted nodes without energy-intensive mining.

Question 5

What is a blockchain fork?

Accepted Answer

A divergence in the blockchain creating two separate chains

Answer

A fork occurs when the blockchain diverges into two paths, either temporarily (soft fork) or permanently (hard fork), due to rule changes or disagreements.

Blockchain 101 Certification Practice Test

Blockchain 101 Certification Practice Test

Blockchain 101 Certification Blockchain 101 Certification Consensus Mechanisms & Protocols 1