Blockchain CBBF 問題練習

Question No : 1
Blockchain allows for which of the following?

• A.Anonymous Cryptography
• B.Trust in central authorities
• C.A fast and efficient ledger
• D.A peer to peer ledger without the need of a third party

答えを確認する

正解:
Explanation:
Reference: https://intellipaat.com/blog/what-is-blockchain-technology/

Question No : 2
In a private business Blockchain, transactions are endorsed by______________.

• A.only relevant business participants
• B.only the smart contract developer
• C.all the nodes on the Blockchain
• D.all participants with access to the network

答えを確認する

正解:
Explanation:
Reference: https://developer.ibm.com/opentech/wp-content/uploads/sites/43/2017/08/Blockchain­Explained-v4.06.AdaptedforBeirutConferenceAug2017-1.pdf (p.10)

Question No : 3
____________ledger technology is referred to as DLT.

• A.Distributed
• B.Decentralized
• C.Database
• D.All of the above
• E.None of the above

答えを確認する

正解:
Explanation:
Reference: https://cryptocurrencyfacts.com/what-is-distributed-ledger-technology-dlt/

Question No : 4
A Blockchain does NOT provide which attribute?

• A.Security through distribution
• B.Anonymity through cryptography
• C.Fault Tolerance through distribution
• D.Immutability through hashing

答えを確認する

正解:

Question No : 5
Blockchain applications can provide____________________.

• A.the elimination of intermediaries
• B.building more trust between trusted parties
• C.collaboration between trusted parties
• D.better cooperation between banks

答えを確認する

正解:

Question No : 6
One solution to increasing Blockchain Transactions Per Second (TPS) is________.

• A.adding more network nodes
• B.off-chain transactions
• C.using faster microprocessors
• D.fewer regulations

答えを確認する

正解:

Question No : 7
An asset is defined as ____________.

• A.all records on a database
• B.any data on the ledger
• C.anything of value requiring accountability of ownership
• D.any record on a private network

答えを確認する

正解:

Question No : 8
Once a record is stored on the Blockchain ____________.

• A.the record is moved to a secure server
• B.the record is stored on a central node
• C.it can be changed by an authorized person
• D.the record is permanent

答えを確認する

正解:
Explanation:
Reference can be changed by an authorized person

Question No : 9
One of the big issues that new financial transaction Blockchain solutions face is____________.

• A.increasing the number of transactions per second (TPS)
• B.the inability to find use cases
• C.solving user identity
• D.getting banks to cooperate

答えを確認する

正解:
Explanation:
Reference: https://www.cnbc.com/2018/10/01/five-crucial-challenges-for-blockchain-to-overcome­deloitte.html

Question No : 10
Which Blockchain protocol uses Proof of Work Consensus? Select all that apply

• A.Hyperledger
• B.Corda
• C.Bitcoin
• D.Ethereum
• E.All of the above

答えを確認する

正解:

Question No : 11
The Ethereum Blockchain provides a/an _____________ virtual machine.

• A.Windows compatible
• B.energy efficient
• C.Linux compatible
• D.turing-complete

答えを確認する

正解:
Explanation:
Reference: https://www.mycryptopedia.com/ethereum-virtual-machine-explained/

Question No : 12
Which of the following statements sums up the Proof of Work consensus process?

• A.Miners complete to find a nonce results in a hash that starts with a predetermined number of leading zeros.
• B.Miners put up a stake. A miner is then selected based on stake value to add a new block to the chain. If a miner adds an invalid block to the chain, that miner loses their stake.
• C.All nodes agree on the data of the transaction.
• D.Miners send assets to an inactive address. This process selects the next owner of a block.

答えを確認する

正解:
Explanation:
Reference: https://www.nichanank.com/blog/2018/5/23/consensus-algorithms-pow

Question No : 13
How is Blockchain benefiting voting?

• A.By revealing the identity of each voter and who or what they voted for
• B.By controlling who gets to vote
• C.By only allowing a certain number of votes per person
• D.By allowing voters to trust their vote has been counted

答えを確認する

正解:

Question No : 14
Which item(s) make up a block header?

• A.The hash of the Merkle root and the header of the previous block
• B.The hash of every transaction in a specific block and the next block
• C.The time stamp of the block and the genesis block hash
• D.The hash of the previous block

答えを確認する

正解:
Explanation:
Reference: https://www.cryptocompare.com/coins/guides/what-is-a-block-header-in-bitcoin/

Question No : 15
Which of the following are practical use cases for Blockchain?

• A.Voting
• B.A video sharing website
• C.Medical records
• D.Identity management
• E.All of the above

答えを確認する

正解:
Explanation:
Reference: https://www.mycryptopedia.com/16-promising-blockchain-use-cases/