Other Consensus Algorithms and Blockchain Security: Enhance Your Blockchain Knowledge

Question 1

Which of the following is NOT a fundamental security property of consensus algorithms in blockchain networks?

Accepted Answer

Efficiency

Answer

Safety

Answer

Liveness

Answer

Fault tolerance

Question 2

Which consensus algorithm is best suited for blockchain applications that prioritize high transaction throughput?

Accepted Answer

Delegated Proof-of-Stake (DPoS)

Answer

Proof-of-Work (PoW)

Answer

Practical Byzantine Fault Tolerance (PBFT)

Question 3

In permissioned blockchain networks where nodes are known and trusted, which consensus algorithm is commonly employed?

Accepted Answer

Proof-of-Authority (PoA)

Answer

Proof-of-Work (PoW)

Answer

Proof-of-Stake (PoS)

Answer

Practical Byzantine Fault Tolerance (PBFT)

Question 4

Which consensus algorithm involves a group of elected delegates validating transactions?

Accepted Answer

Delegated Proof-of-Stake (DPoS)

Answer

Proof-of-Work (PoW)

Answer

Practical Byzantine Fault Tolerance (PBFT)

Answer

Proof-of-Authority (PoA)

Question 5

For which type of blockchain network is Proof-of-Authority (PoA) a suitable consensus algorithm?

Accepted Answer

Permissioned

Answer

Hybrid

Answer

Semi-permissioned

Answer

Public

Question 6

What is a unique advantage of Practical Byzantine Fault Tolerance (PBFT) over other consensus algorithms?

Accepted Answer

Tolerance to Byzantine faults

Answer

Low energy consumption

Answer

Fast consensus times

Answer

High scalability

Question 7

Which of the following is a potential trade-off associated with Delegated Proof-of-Stake (DPoS)?

Accepted Answer

Increased centralization

Answer

High energy consumption

Answer

Slow transaction times

Answer

Vulnerability to 51% attacks

Question 8

What is the primary method used by Proof-of-Work (PoW) to reach consensus?

Accepted Answer

Solving complex computational puzzles

Answer

Byzantine agreement

Answer

Majority voting

Answer

Delegation of validation power

Question 9

Which consensus algorithm provides the highest level of security in terms of transaction immutability?

Accepted Answer

Practical Byzantine Fault Tolerance (PBFT)

Answer

Proof-of-Stake (PoS)

Answer

Delegated Proof-of-Stake (DPoS)

Answer

Proof-of-Work (PoW)

Question 10

In a Delegated Proof-of-Stake (DPoS) network, what is the primary role of 'validators'?

Accepted Answer

To verify transactions and add them to the blockchain

Answer

To solve complex computational puzzles

Answer

To govern the network and make decisions

Question 11

Which of the following is NOT a characteristic of Proof-of-Authority (PoA)?

Accepted Answer

High decentralization

Answer

Fast transaction confirmation

Answer

Permissioned network

Question 12

What is the primary goal of blockchain security in the context of consensus algorithms?

Accepted Answer

To ensure the integrity, authenticity, and availability of blockchain data

Answer

To enhance transaction efficiency

Answer

To prevent double-spending

Question 13

In which consensus algorithm do a predefined set of trusted validators authorize transactions and create blocks?

Accepted Answer

Proof-of-Authority (PoA)

Answer

Proof-of-Work (PoW)

Answer

Practical Byzantine Fault Tolerance (PBFT)

Answer

Delegated Proof-of-Stake (DPoS)

Question 14

Which consensus algorithm is designed to provide consensus even when malicious participants are present?

Accepted Answer

Practical Byzantine Fault Tolerance (PBFT)

Answer

Delegated Proof-of-Stake (DPoS)

Answer

Proof-of-Authority (PoA)

Answer

Proof-of-Work (PoW)

Question 15

A concern regarding Proof-of-Authority is its:

Accepted Answer

Centralized structure

Answer

High energy consumption

Answer

Vulnerability to 51% attacks

Answer

Limited transaction capacity

Question 16

Which of the following is a potential challenge associated with Delegated Proof-of-Stake?

Accepted Answer

Risk of collusion among validators

Answer

Susceptibility to double-spending

Answer

Excessive computational requirements

Answer

Low transaction throughput

Question 17

Which of the following represents a trade-off inherent to Delegated Proof-of-Stake?

Accepted Answer

Centralization versus efficiency

Answer

Energy consumption versus transaction throughput

Answer

Security versus scalability

Question 18

Which consensus algorithm involves a set of elected delegates who validate transactions?

Accepted Answer

Delegated Proof-of-Stake (DPoS)

Answer

Proof-of-Stake (PoS)

Answer

Proof-of-Work (PoW)

Answer

Practical Byzantine Fault Tolerance (PBFT)

Question 19

Which consensus algorithm is designed to handle high network latency and asynchronous communication?

Accepted Answer

Practical Byzantine Fault Tolerance (PBFT)

Answer

Proof-of-Work (PoW)

Answer

Proof-of-Stake (PoS)

Answer

Delegated Proof-of-Stake (DPoS)

Question 20

Which consensus algorithm prioritizes fast transaction processing times by reducing decentralization?

Accepted Answer

Delegated Proof-of-Stake (DPoS)

Answer

Proof-of-Stake (PoS)

Answer

Practical Byzantine Fault Tolerance (PBFT)

Answer

Proof-of-Work (PoW)

Question 21

Which security property is strengthened by increasing the number of participants in a blockchain network?

Accepted Answer

Byzantine fault tolerance

Answer

Scalability

Answer

Data confidentiality

Answer

Data integrity

Question 22

Which type of attack is intended to prevent users from accessing a blockchain network?

Accepted Answer

Denial-of-service (DoS) attack

Answer

Phishing attack

Answer

Man-in-the-middle attack

Answer

Sybil attack

Question 23

Which security measure involves encrypting data before storing it on the blockchain?

Accepted Answer

End-to-end encryption

Answer

Hashing

Answer

Digital signature

Answer

Salting

Question 24

Which type of blockchain allows anyone to read and write transactions to the public ledger?

Accepted Answer

Public blockchain

Answer

Consortium blockchain

Answer

Private blockchain

Answer

Hybrid blockchain

Question 25

Which security concern is particularly relevant to the use of smart contracts?

Accepted Answer

Code vulnerabilities

Answer

Network congestion

Answer

Double spending

Answer

Transaction fees