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Consensus Mechanisms

Description: This quiz will test your knowledge of consensus mechanisms, which are used to achieve agreement on a single, shared state in a distributed system.
Number of Questions: 16
Created by:
Tags: blockchain consensus mechanisms distributed systems
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Which consensus mechanism is used by Bitcoin?

  1. Proof of Work

  2. Proof of Stake

  3. Delegated Proof of Stake

  4. Practical Byzantine Fault Tolerance

Show answer
Correct Option: A
Explanation:

Proof of Work is a consensus mechanism that requires miners to solve complex mathematical problems in order to add new blocks to the blockchain.

What is the purpose of a consensus mechanism?

  1. To prevent double-spending

  2. To ensure that all nodes in the network agree on the current state of the blockchain

  3. To reward miners for their work

  4. All of the above

Show answer
Correct Option: D
Explanation:

Consensus mechanisms are used to prevent double-spending, ensure that all nodes in the network agree on the current state of the blockchain, and reward miners for their work.

Which consensus mechanism is used by Ethereum?

  1. Proof of Work

  2. Proof of Stake

  3. Delegated Proof of Stake

  4. Practical Byzantine Fault Tolerance

Show answer
Correct Option: A
Explanation:

Ethereum currently uses Proof of Work, but is planning to transition to Proof of Stake in the future.

What is the difference between Proof of Work and Proof of Stake?

  1. Proof of Work requires miners to solve complex mathematical problems, while Proof of Stake requires miners to hold a certain amount of cryptocurrency

  2. Proof of Work is more secure than Proof of Stake

  3. Proof of Stake is more energy-efficient than Proof of Work

  4. All of the above

Show answer
Correct Option: D
Explanation:

Proof of Work requires miners to solve complex mathematical problems, while Proof of Stake requires miners to hold a certain amount of cryptocurrency. Proof of Work is more secure than Proof of Stake, but Proof of Stake is more energy-efficient.

Which consensus mechanism is used by Cardano?

  1. Proof of Work

  2. Proof of Stake

  3. Delegated Proof of Stake

  4. Practical Byzantine Fault Tolerance

Show answer
Correct Option: B
Explanation:

Cardano uses a Proof of Stake consensus mechanism called Ouroboros.

What is the difference between Delegated Proof of Stake and Proof of Stake?

  1. In Delegated Proof of Stake, token holders can delegate their voting power to other users, while in Proof of Stake, token holders must vote themselves

  2. Delegated Proof of Stake is more secure than Proof of Stake

  3. Delegated Proof of Stake is more energy-efficient than Proof of Stake

  4. None of the above

Show answer
Correct Option: A
Explanation:

In Delegated Proof of Stake, token holders can delegate their voting power to other users, while in Proof of Stake, token holders must vote themselves.

Which consensus mechanism is used by EOS?

  1. Proof of Work

  2. Proof of Stake

  3. Delegated Proof of Stake

  4. Practical Byzantine Fault Tolerance

Show answer
Correct Option: C
Explanation:

EOS uses a Delegated Proof of Stake consensus mechanism.

What is the difference between Practical Byzantine Fault Tolerance and other consensus mechanisms?

  1. Practical Byzantine Fault Tolerance can tolerate up to 1/3 of malicious nodes, while other consensus mechanisms can only tolerate up to 1/2 of malicious nodes

  2. Practical Byzantine Fault Tolerance is more secure than other consensus mechanisms

  3. Practical Byzantine Fault Tolerance is more energy-efficient than other consensus mechanisms

  4. None of the above

Show answer
Correct Option: A
Explanation:

Practical Byzantine Fault Tolerance can tolerate up to 1/3 of malicious nodes, while other consensus mechanisms can only tolerate up to 1/2 of malicious nodes.

Which consensus mechanism is used by Hyperledger Fabric?

  1. Proof of Work

  2. Proof of Stake

  3. Delegated Proof of Stake

  4. Practical Byzantine Fault Tolerance

Show answer
Correct Option: D
Explanation:

Hyperledger Fabric uses a Practical Byzantine Fault Tolerance consensus mechanism.

What is the difference between consensus and finality?

  1. Consensus is the process of reaching agreement on the current state of the blockchain, while finality is the point at which a block is considered to be irreversible

  2. Consensus is more important than finality

  3. Finality is more important than consensus

  4. None of the above

Show answer
Correct Option: A
Explanation:

Consensus is the process of reaching agreement on the current state of the blockchain, while finality is the point at which a block is considered to be irreversible.

Which consensus mechanism is used by Algorand?

  1. Proof of Work

  2. Proof of Stake

  3. Delegated Proof of Stake

  4. Pure Proof of Stake

Show answer
Correct Option: D
Explanation:

Algorand uses a Pure Proof of Stake consensus mechanism.

What is the difference between Pure Proof of Stake and other Proof of Stake mechanisms?

  1. Pure Proof of Stake does not require miners to hold any cryptocurrency, while other Proof of Stake mechanisms do

  2. Pure Proof of Stake is more secure than other Proof of Stake mechanisms

  3. Pure Proof of Stake is more energy-efficient than other Proof of Stake mechanisms

  4. All of the above

Show answer
Correct Option: A
Explanation:

Pure Proof of Stake does not require miners to hold any cryptocurrency, while other Proof of Stake mechanisms do.

Which consensus mechanism is used by Solana?

  1. Proof of Work

  2. Proof of Stake

  3. Delegated Proof of Stake

  4. Proof of History

Show answer
Correct Option: D
Explanation:

Solana uses a Proof of History consensus mechanism.

What is the difference between Proof of History and other consensus mechanisms?

  1. Proof of History uses a verifiable delay function to order transactions, while other consensus mechanisms use a variety of other methods

  2. Proof of History is more secure than other consensus mechanisms

  3. Proof of History is more energy-efficient than other consensus mechanisms

  4. All of the above

Show answer
Correct Option: A
Explanation:

Proof of History uses a verifiable delay function to order transactions, while other consensus mechanisms use a variety of other methods.

Which consensus mechanism is used by Avalanche?

  1. Proof of Work

  2. Proof of Stake

  3. Delegated Proof of Stake

  4. Snowflake

Show answer
Correct Option: D
Explanation:

Avalanche uses a Snowflake consensus mechanism.

What is the difference between Snowflake and other consensus mechanisms?

  1. Snowflake uses a directed acyclic graph (DAG) to order transactions, while other consensus mechanisms use a variety of other methods

  2. Snowflake is more secure than other consensus mechanisms

  3. Snowflake is more energy-efficient than other consensus mechanisms

  4. All of the above

Show answer
Correct Option: A
Explanation:

Snowflake uses a directed acyclic graph (DAG) to order transactions, while other consensus mechanisms use a variety of other methods.

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