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System Architecture & Design Flashcards

7 cards from real CBDH practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. In Hyperledger Fabric, which component is responsible for ordering transactions into blocks?

    Answer: Ordering service node

    The ordering service sequences endorsed transactions and packages them into blocks.

  2. Which consensus mechanism is the recommended production ordering service in Fabric v2.x?

    Answer: Raft

    Raft is the crash-fault-tolerant ordering service recommended since v2.0, with Kafka deprecated.

  3. What does a Fabric endorsement policy specify?

    Answer: Which organizations' peers must sign a transaction for it to be valid

    Endorsement policies define the set of peer signatures required for a transaction to pass validation.

  4. How do private data collections keep data confidential from other channel members?

    Answer: Only a hash goes on the shared ledger while the data stays in a side database on authorized peers

    Authorized peers hold private data in a side database, and only its hash is committed to the channel ledger.

  5. What is the primary purpose of an anchor peer in a Fabric channel?

    Answer: Enabling gossip communication discovery across organizations

    Anchor peers let peers from different organizations discover each other through gossip.

  6. In Fabric, what does a Membership Service Provider (MSP) define?

    Answer: How identities are validated and which roles they hold in an organization

    An MSP abstracts the identity validation rules, such as trusted CAs and roles, for an organization.

  7. What is a Fabric channel?

    Answer: A private subnet of communication with its own separate ledger among specific members

    Each channel maintains its own ledger and membership, isolating data from other channels.

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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