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CBDH Consensus & Transaction Validation Flashcards

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  1. What is a 'channel' in Hyperledger Fabric and how does it relate to consensus?

    Answer: An isolated ledger and messaging environment where a subset of network members share a consensus context

    A channel provides data isolation by maintaining a separate ledger and ordering context, so only channel members participate in consensus for that channel's transactions.

  2. What is the significance of the 'BatchTimeout' setting in the Fabric orderer configuration?

    Answer: Maximum wait time before the orderer cuts a block even if BatchSize isn't reached

    BatchTimeout sets the maximum time the orderer waits after the first transaction arrives before cutting a block, trading latency for throughput.

  3. In Hyperledger Fabric, what is an 'anchor peer' and its role in consensus-related communication?

    Answer: The peer in an organization that is discoverable by other organizations for cross-org gossip

    An anchor peer is the known contact point for an organization, enabling cross-organizational gossip so peers in different orgs can discover each other and exchange channel updates.

  4. What does 'state-based endorsement' allow in Hyperledger Fabric?

    Answer: Different endorsement policies per individual key in the world state, overriding the chaincode-level policy

    State-based endorsement lets chaincode set per-key endorsement policies using stub.SetStateValidationParameter(), allowing fine-grained control beyond the chaincode-level policy.

  5. How does Hyperledger Fabric achieve transaction finality compared to probabilistic blockchains?

    Answer: Through deterministic finality — once a block is committed it is irreversible, with no forks possible

    Fabric achieves deterministic finality because the CFT ordering service guarantees block order and prevents forks, so committed transactions are final immediately.

  6. What configuration parameter controls the maximum number of transactions per block in Hyperledger Fabric?

    Answer: MaxMessageCount in BatchSize

    MaxMessageCount is a BatchSize parameter that sets the upper limit on transactions per block, with the orderer cutting a block when this count is reached.

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Sources & references

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  1. blockchaintrainingalliance.com — Test delivery, passing score, score release, test dates, fees, exam format, time limit · verified Oct 2026