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NPTEL Blockchain and its Applications Assignment 6 Answers 2023:
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Q.1. If there are 24 faulty nodes (crash fault) in asynchronous CFT, at least how many nodes needed to reach consensus
Q.2. In Paxos, a node can have only one role among the three roles at a time. True or False.
- a. False
- b. True
Q.3. Can we reach a consensus when there is one commander, one good lieutenant, and one faulty lieutenant in a Byzantine Generals Problem. Yes or No?
- a. Yes
- b. No
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Q.4. If there are 24 faulty nodes in, at least how many nodes needed to reach consensus in the Byzantine Fault Tolerance (BFT) system.
Q.5. Which are the examples of the synchronous consensus techniques?
- a. RAFT
- b. PAXOS
- c. Byzantine General Model
- d. Practical Byzantine General Model
Q.6. Which of the following is false for single Paxos
- a. Paxos runs based on state machine replication
- b. Proposers and Acceptors maintain a state of the running epochs
- c. Once a consensus is reached, single Paxos consensus progresses to another consensus of the value.
- d. None of the above
Q.7. Which are the properties of an asynchronous consensus:
- a. Validity
- b. Agreement
- c. Termination
- d. Integrity
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Q.8. Which of the following is true for the permissioned model of blockchain?
- a. Participants are pre-authorized
- b. Membership Service providers help to obtain membership of the corresponding network
- c. Security and consensus need to be established
- d. All of the above
Q.9. Which of the following is/are true for smart contracts on a closed network?
- a. Contract is stored on a blockchain ledger
- b. Once an event is triggered, execute the codes locally on peers
- c. Generate transactions as the output of execution of contract
- d. The peers of the blockchain network validates the transactions and transactions are committed after successful validation.
Q.10. Which of the following is/are true for basic Multi-Paxos
- a. Applications often needs a continuous stream of agreed values
- b. Run Multiple instances of Paxos with different round number
- c. If a value has been accepted for a round process further accept requests for different value in that round
- d. All of the above
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About NPTEL Blockchain and its Applications Course:
In the last few years, Blockchain technology has generated massive interest among governments, enterprises, and academics, because of its capability of providing a transparent, secured, tamper-proof solution for interconnecting different stakeholders in a trustless setup. In January 2021, the Ministry of Electronics and Information Technology (MeiTY), Government of India, published the first draft of the “National Strategy on Blockchain” that highlights 17 potential applications that are of national interest. Against this backdrop, this subject will cover the basic design principles of Blockchain technology and its applications over different sectors.
Course Layout:
- Week 1: Introduction to Blockchain Technology and its Importance
- Week 2: Basic Crypto Primitives I – Cryptographic Hash
- Week 3: Basic Crypto Primitives II – Digital Signature
- Week 4: Evolution of the Blockchain Technology
- Week 5: Elements of a Blockchain
- Week 6: Blockchain Consensus I – Permissionless Models
- Week 7: Blockchain Consensus II – Permissioned Models
- Week 8: Smart Contract Hands On I – Ethereum Smart Contracts (Permissionless Model)
- Week 9: Smart Contract Hand On II – Hyperledger Fabric (Permissioned Model)
- Week 10: Decentralized Identity Management
- Week 11: Blockchain Interoperability
- Week 12: Blockchain Applications
CRITERIA TO GET A CERTIFICATE:
Average assignment score = 25% of average of best 8 assignments out of the total 12 assignments given in the course.
Exam score = 75% of the proctored certification exam score out of 100
Final score = Average assignment score + Exam score
YOU WILL BE ELIGIBLE FOR A CERTIFICATE ONLY IF AVERAGE ASSIGNMENT SCORE >=10/25 AND EXAM SCORE >= 30/75. If one of the 2 criteria is not met, you will not get the certificate even if the Final score >= 40/100.
If you have not registered for exam kindly register Through https://examform.nptel.ac.in/
