a. POW always ensures consensus finality b. POW does not ensure consensus finality c. PBFT protocol always ensures consensus finality d. PBFT protocol does not ensure consensus finality
2) Which of the following is/are true regarding the CoSi protocol?
a. Witnesses are organized in a tree structure b. Three rounds of PBFT can be emulated using one round of CoSi protocol c. It can be used to sign a message by multiple authorities collectively d. Three rounds of PBFT can be emulated using two rounds of CoSi protocol
3) Which of the following factor(s) distinguish Bitcoin-NG from Bitcoin?
a. Decoupling the leader election and transaction serialization b. Use of key blocks and macroblocks c. Bitcoin-NG has lower transaction throughput as compared to Bitcoin d. Leader election using PBFT
4) Which of the following is/are true regarding Bitcoin-NG?
a. Microblock generation rate is lower than the key block generation rate b. Microblock generation rate is higher than the key block generation rate c. The interval between the generation of two key blocks is exponentially distributed d. The key block contains the ledger entries
a. PBFT protocol ensures total ordering of transactions b. Bitcoin has lower node scalability as compared to Standard BFT protocols c. Standard BFT protocols never produce lower transaction throughput as compared to Bitcoin d. Bitcoin-NG has higher node scalability as compared to Standard Bitcoin protocols in general
6) What is the primary function of a Fabric smart contract (Chaincode)?
a. Performing cryptocurrency mining b. Defining the business rules and logic in the ledger c. Defining consensus algorithms d. Monitoring the transaction throughput
8) Which of the following is/are true regarding fabric transactions?
a. The transactions should be endorsed by peers b. The transactions are committed without validation c. A transaction does not change the world state d. World state holds the current updated consensus view
10) Which of the following is/are correct regarding Schnorr Multisignature in CoSi protocol?
a. It is difficult to verify the signature b. Signature can be verified using a single collective public key c. It is easy to verify the signature d. It relies on group G of any composite order
Blockchain and its Applications Assignment 8 AnswersJAN-APR 2024
Q1. Which of the following is an open, scalable consensus algorithm having low transaction throughput? a. PoW b. PoS c. PBFT d. PoL
Answer: a. PoW
Q2. Running a chaincode in hyperledger fabric internally involves the following steps even if all the steps are not explicitly done by the user in the latest versions. i. Instantiation of Chaincode of Channel ii. Creation of Channel iii. Configuring Orderer and Peer nodes iv. Adding members to Channel v. Installing chaincode on peers Which of the following sequence of steps is valid? a. ii, iv, iii, i b. iv, iii, v, i c. v, i, ii, iv d. iii, v, ii, iv, i
Answer: d. iii, v, ii, iv, i
These are Blockchain and its Applications Assignment 8 Answers
Q3. Hyperledger Fabric only allows Proof of Work consensus to be plugged in to ensure a high degree of trustworthiness. True or False a. True b. False
Answer: b. False
Q4. Traditional methods for centralized digital identity management do NOT have which of the following characteristics? a. Identity holder can easily decide with whom to share the identity and which part of it b. Identity theft can occur and remain undetected c. Restricting components of identity to be revealed to different verifiers is difficult d. An attacker can capture the presented identity
Answer: a. Identity holder can easily decide with whom to share the identity and which part of it
These are Blockchain and its Applications Assignment 8 Answers
Q5. Which of the following statements is/are FALSE regarding PBFT and PoW? a. PoW can be executed over both public and private blockchain networks. b. PBFT can be executed over a private blockchain network, but not chosen to be executed over a public blockchain network in general. C. PBFT can be generally preferred to be executed for both public and private blockchain networks d. PoW can be executed over a private blockchain network but can not be executed over a public blockchain network
Q6. Which of the following is/are true for Proof Of Work) PoW protocol a. Generally used in Open environment b. Scalable c. Transaction Per second (TPS) is low in general d. All of the above
Answer: a, b, c, d
These are Blockchain and its Applications Assignment 8 Answers
Q7. PBFT has higher transaction throughput than PoW a. False b. True
Answer: b. True
Q8. Which of the below statements is true? a. PoW is a non-randomized protocol b. Pow can always ensure consensus finality c. BFT protocols ensure total ordering of transactions d. None of the above
Answer: c. BFT protocols ensure total ordering of transactions
These are Blockchain and its Applications Assignment 8 Answers
Q9. BFT protocol ensures finality in general. a. False b. True
Answer: b. True
Q10. 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 is used to sign a message by multiple authorities collectively d. none of the above
Blockchain and its Applications Assignment 8 AnswersJAN-APR 2022
Q1. 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
Q2. 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
These are Blockchain and its Applications Assignment 8 Answers
Q3. 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 quorams 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
Q4. Alice wants to interact with an Ethereum Network. Which of the following are required to do that? a. web3js b. nodejs c. geth d. bitcon
Answer: a, c
These are Blockchain and its Applications Assignment 8 Answers
Q5. 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. Will downloads all blocks including headers, transactions and receipts, will verify all headers, and downloads the state and verify it against the headers.
Q6. Which of the following is an open, scalable consensus algorithm having low transaction throughput? a. Pow b. PoS c. PBFT d. PoB
Answer: a. Pow
These are Blockchain and its Applications Assignment 8 Answers
Q7. In basic form PBFT has higher transaction throughput than PoW a. False b. True
Answer: b. True
Q8. Which of the below statements is true? a. PoW is a 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. BFT protocols ensure total ordering of transactions
These are Blockchain and its Applications Assignment 8 Answers
Q9. BFT protocol ensures finality in general. a. False b. True
Answer: b. True
Q10. 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. True
These are Blockchain and its Applications Assignment 8 Answers
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