18 Questions
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.
According to the typical PoS workflow described, what is the first step?
Nodes make transactions, which are put into a pool.
What factors are combined with the stake to select the validator in the described PoS mechanism?
Coin-age and randomized block selection.
In the typical PoS workflow, what is the final step?
The validator verifies transactions and publishes the block.
What is the purpose of the 'randomized block selection' mechanism mentioned in the text?
To ensure that the same node does not become the validator repeatedly.
What is the role of the validator node in the PoS mechanism?
To verify transactions and publish blocks.
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?
2f + 1 prepared messages
What is the purpose of the Commit phase in the PBFT consensus algorithm?
To allow nodes to execute the client's request if they have received a sufficient number of commit messages
Which of the following is an advantage of the PBFT consensus algorithm?
It is resistant to Byzantine faults, where nodes can behave arbitrarily or maliciously
What is a potential disadvantage of the PBFT consensus algorithm?
It has a high communication overhead, which can lead to scalability issues
In the Pre-prepare phase of the PBFT consensus algorithm, what does the leader node do?
The leader node sends out a pre-prepared message to each backup node
Which of the following statements is true about the PBFT consensus algorithm?
It ensures that all nodes in the network have the same view of the blockchain
In the Prepare phase of the PBFT consensus algorithm, what is the role of the primary node?
The primary node broadcasts a PRE-PREPARE message containing the client's request to all backup nodes.
What is the purpose of the Commit phase in the PBFT consensus algorithm?
To enable backup nodes to commit the requested operation to their local replicas.
What is an advantage of the PBFT consensus algorithm?
It ensures that all nodes have the same view of the blockchain, preventing forks.
What is a disadvantage of the PBFT consensus algorithm?
It has a high communication overhead due to the exchange of multiple messages.
What is the purpose of the PRE-PREPARE phase in the PBFT consensus algorithm?
To initiate the consensus process by broadcasting the client's request to all backup nodes.
In the PBFT consensus algorithm, what happens if the primary node is faulty or malicious?
The backup nodes can detect the faulty primary node and elect a new primary node.
Learn about the Practical Byzantine Fault Tolerance (PBFT) consensus algorithm used in blockchain networks to achieve consensus among nodes. Understand how honest nodes reach a majority-based decision, verify message sources, and ensure message integrity.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
