PBFT Consensus Algorithm in Blockchain Networks
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Questions and Answers

What is the purpose of the 'coin-age based selection' mechanism in the provided text?

  • To ensure that older nodes have a higher chance of becoming validators. (correct)
  • To randomly select validators from the pool of nodes.
  • To prioritize nodes with higher stakes over those with lower stakes.
  • To verify transactions and publish blocks.

According to the typical PoS workflow described, what is the first step?

  • The algorithm selects a validator based on stake and other factors.
  • Nodes make transactions, which are put into a pool. (correct)
  • The validator verifies transactions and publishes a block.
  • Nodes raise stakes to become validators.

What factors are combined with the stake to select the validator in the described PoS mechanism?

  • Coin-age and randomized block selection. (correct)
  • Node reputation and network latency.
  • Computational power and energy efficiency.
  • Transaction fees and block size.

In the typical PoS workflow, what is the final step?

<p>The validator verifies transactions and publishes the block. (B)</p> Signup and view all the answers

What is the purpose of the 'randomized block selection' mechanism mentioned in the text?

<p>To ensure that the same node does not become the validator repeatedly. (B)</p> Signup and view all the answers

What is the role of the validator node in the PoS mechanism?

<p>To verify transactions and publish blocks. (A)</p> Signup and view all the answers

In the Prepare phase of the PBFT consensus algorithm, what is the minimum number of prepared messages a node must receive before it is considered prepared?

<p>2f + 1 prepared messages (B)</p> Signup and view all the answers

What is the purpose of the Commit phase in the PBFT consensus algorithm?

<p>To allow nodes to execute the client's request if they have received a sufficient number of commit messages (B)</p> Signup and view all the answers

Which of the following is an advantage of the PBFT consensus algorithm?

<p>It is resistant to Byzantine faults, where nodes can behave arbitrarily or maliciously (D)</p> Signup and view all the answers

What is a potential disadvantage of the PBFT consensus algorithm?

<p>It has a high communication overhead, which can lead to scalability issues (D)</p> Signup and view all the answers

In the Pre-prepare phase of the PBFT consensus algorithm, what does the leader node do?

<p>The leader node sends out a pre-prepared message to each backup node (B)</p> Signup and view all the answers

Which of the following statements is true about the PBFT consensus algorithm?

<p>It ensures that all nodes in the network have the same view of the blockchain (C)</p> Signup and view all the answers

In the Prepare phase of the PBFT consensus algorithm, what is the role of the primary node?

<p>The primary node broadcasts a PRE-PREPARE message containing the client's request to all backup nodes. (D)</p> Signup and view all the answers

What is the purpose of the Commit phase in the PBFT consensus algorithm?

<p>To enable backup nodes to commit the requested operation to their local replicas. (C)</p> Signup and view all the answers

What is an advantage of the PBFT consensus algorithm?

<p>It ensures that all nodes have the same view of the blockchain, preventing forks. (C)</p> Signup and view all the answers

What is a disadvantage of the PBFT consensus algorithm?

<p>It has a high communication overhead due to the exchange of multiple messages. (C)</p> Signup and view all the answers

What is the purpose of the PRE-PREPARE phase in the PBFT consensus algorithm?

<p>To initiate the consensus process by broadcasting the client's request to all backup nodes. (A)</p> Signup and view all the answers

In the PBFT consensus algorithm, what happens if the primary node is faulty or malicious?

<p>The backup nodes can detect the faulty primary node and elect a new primary node. (B)</p> Signup and view all the answers
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