Blockchain and its Applications Assignment 8 Answers
1) Which of the following is/are true for (Proof Of Work) PoW protocol
a. Open environment
b. Scalable
c. Transaction Per Second (TPS) is low in general in comparison to permissioned protocol
d. None of the above
Answer: a, b, c
2) Which of the following is/are true for scalable witness cosigning protocol?
a. protect authorities and their clients from undetected misuse
b. ensuring that every authoritative statement is validated
c. It can used to sign a message by multiple authorities collectively
d. none of the above
Answer: a, b, c
3) Which statement(s) are true about Byzantine Dissemination Quorum:
i. Any 2 quorums have at least one correct replica in common
ii. If you have 3 numbers of faulty nodes you need at least 10 replicas to reach consensus
iii. Any 2 quorums have at most one correct replica in common
iv. PBFT uses Byzantine Dissemination Quorum with 2f + 2 replicas
a. i, ii
b. ii, iv
c. Only ii
d. Only iv
Answer: c
4) Alice wants to interact with an Ethereum Network. Which of the following are required to do that?
a. web.js
b. nodejs
c. geth
d. bitcoin
Answer: a, c
5) The command: geth –goerli –syncmode “fast” will
a. Will downloads all blocks excluding headers, transactions, and receipts and will generate the state of the blockchain incrementally by executing every block.
b. Will downloads all blocks including headers, transactions, and receipts, will verify all headers, and downloads the state and verify it against the headers.
c. Will downloads all blocks including headers, transactions, and receipts and will generate the state of the blockchain incrementally by executing every block.
d. Will downloads all block headers, block data, and verifies some randomly.
Answer: b
6) Which of the following is an open, scalable consensus algorithm having low transaction throughput?
a. PoW
b. PoS
c. PBFT
d. PoB
Answer: a
7) In basic form PBFT has higher transaction throughput than PoW
a. False
b. True
Answer: b
8) Which of the below statements is true?
a. PoW is an non-randomized protocol
b. BFT protocols ensure total ordering of transactions
c. PoW can always ensure consensus finality
d. None of the above
Answer: b
9) BFT protocol ensures finality in general.
a. False
b. True
Answer: b
10) Hyperledger Fabric allows pluggable implementations of consensus algorithm to ensure a high degree of confidentiality, resiliency and scalability. True or False
a. False
b. True
Answer: b
Disclaimer: Chandras EDU does not guarantee the correctness of the answers. These answers are based on the data provided by the NPTEL video lectures, are just for reference, and request students to complete the assignments independently.
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