Blockchain Developer FREE Blockchain Developer Consensus Algorithms and Protocols Questions and Answers 2

Question 1

What mechanism does Delegated Proof of Stake (DPoS) use to achieve consensus?

Accepted Answer

Token holders vote for a fixed number of delegates who validate blocks

Answer

All nodes compete to solve cryptographic puzzles

Answer

Validators are randomly selected based on coin age

Answer

Nodes reach agreement through repeated rounds of binary voting

Question 2

Which consensus algorithm is specifically designed to tolerate up to one-third of nodes acting maliciously?

Accepted Answer

Practical Byzantine Fault Tolerance (PBFT)

Answer

Proof of Work

Answer

Proof of Authority

Answer

Proof of Elapsed Time

Question 3

In Proof of Stake systems, what is the primary risk that slashing conditions are designed to prevent?

Accepted Answer

Validators signing conflicting blocks or performing equivocation

Answer

Double spending through 51% attacks

Answer

Excessive gas consumption during smart contract execution

Answer

Network congestion from too many pending transactions

Question 4

What is the key advantage of the Nakamoto consensus used in Bitcoin compared to classical BFT protocols?

Accepted Answer

It supports an open and permissionless set of participants

Answer

It achieves instant transaction finality

Answer

It requires no computational resources to operate

Answer

It guarantees zero probability of chain reorganization

Question 5

In the Raft consensus algorithm, what happens when a follower node does not receive a heartbeat from the leader within the election timeout?

Accepted Answer

It becomes a candidate and initiates a new leader election

Answer

It shuts down and waits for manual restart

Answer

It automatically assumes the role of leader without an election

Answer

It begins mining the next block independently

Question 6

What problem does the Longest Chain Rule solve in Proof of Work blockchains?

Accepted Answer

It resolves temporary forks by having nodes adopt the chain with the most cumulative work

Answer

It determines which miner receives the highest reward

Answer

It prevents nodes from joining the network without authorization

Answer

It ensures all transactions have identical gas fees