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Implementation & Configuration Flashcards

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  1. What is the role of the Fabric Gateway introduced in Fabric 2.4?

    Answer: It lets client apps submit transactions through a peer service that coordinates endorsement and submission

    The peer Gateway service simplifies clients by handling endorsement collection and ordering submission.

  2. Which tool decodes protobuf channel configuration into JSON for editing?

    Answer: configtxlator

    configtxlator translates between protobuf and JSON and computes config update deltas.

  3. When upgrading a committed chaincode definition, which value must be incremented?

    Answer: Sequence number

    Each change to the chaincode definition must be approved and committed with sequence incremented by one.

  4. Which variable specifies the organization's MSP ID for the peer CLI?

    Answer: CORE_PEER_LOCALMSPID

    CORE_PEER_LOCALMSPID selects the MSP identity under which CLI commands run.

  5. Which Hyperledger Besu genesis-file element selects the QBFT consensus algorithm?

    Answer: config.qbft

    Besu private networks set qbft (or ibft2) in the genesis config to enable BFT consensus.

  6. What is the purpose of Capabilities in configtx.yaml?

    Answer: Ensure all nodes process features consistently by requiring a minimum version level

    Capabilities prevent nodes of different versions from diverging in behavior on the channel.

  7. What does a Fabric SDK wallet store?

    Answer: User identities with certificates and private keys

    A wallet holds identities (certificate and key) the application uses to sign transactions.

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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