Blockchain and its Applications | NPTEL | Week 7 Assignment Solutions

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Blockchain and its Applications NPTEL Week 7 Assignment Solutions

Q1. Which statement(s) are true about Byzantine Dissemination Quorum:

a) Any two quorums have at least one correct replica in common
b) There is always aa 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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Q2. If you have f number of faulty nodes, then you need at least how many replicas to reach consensus irrespective of crash fault or byzantine fault.

a) 2f + 1
b) 3f + 1
c) f + 1
d) 3f

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Q3. What is the correct sequence of operation in PBFT algorithm
i. Prepare
ii. Reply
iii. Commit
iv. Pre-Prepare

a) iv, i, ii, iii
b) iv, i, iii, ii
c) i, iv, ii, iii
d) i, ii, iv, iii

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Q4. PBFT is safe under _______ quorum over an asynchronous environment

a) 2f + 1
b) 3f + 1
c) f + 1
d) f

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Q5. What are Hyperledger frameworks used for?

a) Hyperledger frameworks are primarily used for building permissioned blockchains for organizations
b) Hyperledger frameworks are primarily used for building public blockchains
c) Hyperledger frameworks are used for only building smart contracts for IBM’s blockchain
d) Hyperledger frameworks are primarily used for building smart contracts for public blockchains

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Blockchain and its Applications NPTEL week 7 Assignment Solutions

Q6. Which of the following(s) is/are benefits of Blockchain for Business

a) Reduced transaction time from days to near instantaneous
b) Removes intermediaries overheads and cost
c) Enables NewBusiness Models such as IoT Integration into supply chain
d) All of the above

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Q7. Which of the following is an open source, enterprise-grade Permissioned DLT platform

a) Hyperledger Fabric
b) Hyperledger Explorer
c) Hyperledger Burrow
d) Hyperledger Indy

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Blockchain and its Applications NPTEL week 7 Assignment Solutions

Q8. Which of the following abstractions in Hyperledger Fabric provide confidentiality to individual ledgers?

a) Ordering Services
b) Peers
c) Channels
d) Endorsement Policies

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Blockchain and its Applications NPTEL week 7 Assignment Solutions

Q9. Suppose there are 5 channels present in a Hyperledger Fabric network, each of the them has access to 3 chaincodes A, B and C. How many containers will run in each peer for running this system?

a) 5
b) 1
c) 3
d) 15

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Q10. Hyperledger Fabric only allows Proof of Work consensus to be plugged in to ensure a high degree of trustworthiness. True or False

a) False
b) True

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Blockchain and its Applications NPTEL week 7 Assignment Solutions

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