CBDH CBDH Consensus & Transaction Validation

Question 1

What is the primary consensus mechanism used in Hyperledger Fabric?

Accepted Answer

Execute-Order-Validate (EOV)

Answer

Proof of Work

Answer

Proof of Stake

Answer

Practical Byzantine Fault Tolerance (PBFT)

Question 2

Which component in Hyperledger Fabric is responsible for ordering transactions into blocks?

Accepted Answer

Ordering service (orderer)

Answer

Endorsing peer

Answer

Committing peer

Answer

Certificate Authority

Question 3

What consensus algorithm does Hyperledger Fabric's Raft-based ordering service use?

Accepted Answer

Crash Fault Tolerant (CFT) Raft

Answer

Kafka consensus

Answer

PBFT

Answer

Proof of Authority

Question 4

What is an 'endorsement policy' in Hyperledger Fabric?

Accepted Answer

A policy specifying which peers must simulate and sign a transaction proposal

Answer

A rule defining which orderers can create blocks

Answer

The CA policy for issuing certificates

Answer

A rule for gossip data dissemination

Question 5

During Hyperledger Fabric transaction flow, what does a client do after collecting endorsements?

Accepted Answer

Submits the endorsed transaction to the ordering service

Answer

Sends the proposal directly to all peers for commitment

Answer

Publishes the transaction to an external blockchain

Answer

Requests the CA to sign the transaction

Question 6

What happens during the 'validate' phase of Fabric's Execute-Order-Validate flow?

Accepted Answer

Peers verify endorsement policy compliance and detect read-write set conflicts

Answer

Peers simulate chaincode execution

Answer

The orderer checks certificate validity

Answer

The CA validates the transaction signature