CBDH CBDH Consensus & Transaction Validation

Question 1

What is the primary consensus mechanism used in Hyperledger Fabric?

Accepted Answer

Execute-Order-Validate (EOV)

Answer

Fabric uses an Execute-Order-Validate architecture where transactions are executed by endorsers, ordered by the ordering service, then validated by all peers.

Question 2

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

Accepted Answer

Ordering service (orderer)

Answer

The ordering service receives endorsed transactions, orders them deterministically, and broadcasts blocks to all channel peers.

Question 3

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

Accepted Answer

Crash Fault Tolerant (CFT) Raft

Answer

Fabric's Raft ordering service uses the Crash Fault Tolerant (CFT) Raft algorithm, tolerating up to (n-1)/2 orderer failures.

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

An endorsement policy defines which organizations' peers must execute chaincode and cryptographically sign the results for a transaction to be valid.

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

After gathering sufficient endorsements, the client packages the proposal responses into a transaction envelope and submits it to the ordering service.

CBDH - Certified Blockchain Developer Hyperledger Practice Test

CBDH - Certified Blockchain Developer Hyperledger Practice Test

CBDH CBDH Consensus & Transaction Validation