NPTEL Blockchain and its Applications Week 7 Assignment Answers 2025
1. Which statements) are not true about Byzantine Dissemination Quorum:
a. Any two quorums have at least one correct replica in common
b. There is always a quorum available with no faulty replicas
c. Any two quorums have at most one correct replica in common
d. There is always a quorum available with some faulty replicas
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2. If you have f number of total faulty nodes, then you need at least how many replicas to reach consensus considering the possibility of both crash fault or byzantine fault.
a. 2f + 1
b. 3f + 1
c. f+1
d. 3f
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3. Which cryptographic technique is primarily used in PBFT to validate message integrity?
a. Hashing
b. Symmetric encryption
c. Digital signatures
d. Sharding
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4. Which mechanism ensures PBFT liveness when the primary fails?
a. Cryptographic signatures
b. View change protocol
c. Pre-prepare and Prepare phases
d. Timeout mechanism
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5. Which of the following statements) are not true regarding Hyperledger frameworks?
a. Hyperledger frameworks are primarily used for building permissioned blockchains for
organizations.
b. Hyperledger frameworks are developed for mainly building public blockchains.
c. Hyperledger frameworks can not use CouchDB.
d. Hyperledger frameworks are only used for building smart contracts for public blockchains
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6. Which of the following(s) is/are benefits of Blockchain for Business?
a. Reduced transaction time in general, from days to near instantaneous for legacy based cross-border interactions
b. The sole centralized authority has been able to remove overheads and cost
c. Supports transparency and traceability in transactions
d. Always increases transaction costs due to complexity
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7. Which of the following are characteristics of permissioned blockchains (in comparison with permissionless blockchains)?
a. Closed membership consensus protocol in permissioned blockchains
b. The identities of nodes are not pre-known in permissioned blockchains
c. Always lower transaction throughput in permissioned blockchains
d. Permissioned blockchains are highly scalable for a large number of nodes
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8. Which of the following abstractions in Hyperledger Fabric primarily provides confidentiality to individual ledgers?
a. Ordering Services
b. Peers
c. Channels
d. Consensus
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9. What is the role of Membership Service Provider (MSP) in Hyperledger Fabric?
a. Assigning sequence numbers to transactions
b. Identity management for network participants
c. Storing ledger data securely
d. Defining consensus mechanism for network
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10. Which of the following are key features of Hyperledger Fabric?
a. Modular architecture with pluggable components
b. Permissionless blockchain framework
c. Support for smart contracts (chain codes) in general-purpose languages
d. Use of native cryptocurrencies for transactions
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