2022年更新のBlockchain Certificationが有効なCBBF問題集を無料提供しています
最新のGoShiken CBBFのPDF問題集をダウンロードしちゃおう：https://www.goshiken.com/Blockchain/CBBF-mondaishu.html（85問題と解答)
Blockchain CBBF 認定試験の出題範囲：
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質問 26
Which Blockchain protocol uses Proof of Work Consensus? Select all that apply
- A. Hyperledger
- B. Ethereum
- C. Bitcoin
- D. All of the above
- E. Corda
正解: A,B,C
質問 27
Where is a Blockchain's central server?
- A. Located with the owner of the server
- B. There is no central server, it is distributed
- C. Orderer Node
- D. None of the above
- E. Where the Blockchain is created
正解: B
質問 28
How do consensus algorithms like Proof of Work or Proof of Stake incentivize miners to participate?
- A. By placing their name on the Blockchain
- B. By paying miners with U.S. dollars
- C. By not charging users monthly subscription costs
- D. By paying the miners with cryptocurrency
正解: D
質問 29
Which type of data can be stored on a Blockchain?
- A. A financial transaction
- B. All of the above
- C. Romeo and Juliet: The entire play
- D. A vote cast in an election
- E. A personal medical record
正解: B
解説:
Explanation/Reference:
質問 30
The Blockchain ledger is commonly referred to as___________.
- A. a database ledger
- B. a genesis block
- C. a triple-entry ledger
- D. a double-entry ledger
正解: A
解説:
Explanation
質問 31
Who governs a Blockchain?
- A. The architects
- B. The creator of the Blockchain
- C. The developers
- D. The users
正解: D
質問 32
Blockchain does not provide?
- A. Security
- B. Fault tolerance
- C. Fact Transaction time
- D. Immutability
正解: C
質問 33
Blockchain allows for which of the following?
- A. A peer to peer ledger without the need of a third party
- B. Anonymous Cryptography
- C. Trust in central authorities
- D. A fast and efficient ledger
正解: A
解説:
Explanation/Reference:
Reference: https://intellipaat.com/blog/what-is-blockchain-technology/
質問 34
Why is Blockchain important?
- A. It provides anonymity when making transactions
- B. It replaces all ledgers
- C. It allows for a secure, global, and peer to peer record of data
- D. All of the above
- E. It is a free, trusted bank
正解: A
質問 35
What is dApp?
- A. A dishonest application
- B. A decentralized application
- C. A distributed application
- D. A decoded application
正解: B
質問 36
Why is Hyperledger a good business solution over other Blockchains?
- A. Always permissioned and private
- B. It can employ smart contracts
- C. Multiple consensus methods can be chosen for use
- D. Modular design allowing for flexibility in solution
- E. All the above
正解: C
質問 37
The Corda distributed ledger is designed for _______________.
- A. Any business transactions
- B. Financial transactions
- C. International shipping
- D. The transportation industry
正解: B
質問 38
One of the great advantages of creating a new Blockchain solution is__________.
- A. merging your existing network technology into a new Blockchain solution
- B. not being limited to a conventional business solution or restriction
- C. All of the above
- D. the ability to completely customize a unique business solution
- E. combining Blockchain technologies to fit your business solution
正解: B
質問 39
How do consensus algorithms like Proof of Work or Proof of Stake incentivize miners to participate?
- A. By placing their name on the Blockchain
- B. By paying miners with U.S. dollars
- C. By not charging users monthly subscription costs
- D. By paying the miners with cryptocurrency
正解: D
解説:
Explanation/Reference: https://www.oliverisaacs.com/proof-of-work-or-proof-of-stake-whats-the-future-of-crypto/
質問 40
Blockchain is faster and more efficient than a standard database.
- A. False
- B. True
正解: A
質問 41
The cryptocurrency Bitcoin is__________.
- A. a replacement currency for the U.S. dollar
- B. the same as all other cryptocurrencies
- C. replacing bartering in many parts of the world
- D. another application that runs on a Blockchain
正解: D
質問 42
Once a record is stored on the Blockchain ____________.
- A. the record is permanent
- B. the record is moved to a secure server
- C. the record is stored on a central node
- D. it can be changed by an authorized person
正解: A
解説:
Explanation
Reference can be changed by an authorized person
質問 43
Blockchains work best when they are____________________.
- A. used alone
- B. combined with other technologies
- C. used as an alternative to a database
- D. used for financial applications
正解: D
質問 44
Which of the following are practical use cases for Blockchain?
- A. Identity management
- B. Voting
- C. A video sharing website
- D. All of the above
- E. Medical records
正解: D
質問 45
The common safe place to store personal cryptocurrency is_____________.
- A. in a secure database
- B. in a secure ledger
- C. a bank account
- D. A digital wallet
正解: D
質問 46
One of the big issues that new financial transaction Blockchain solutions face is____________.
- A. increasing the number of transactions per second (TPS)
- B. solving user identity
- C. the inability to find use cases
- D. getting banks to cooperate
正解: A
解説:
Explanation/Reference:
Reference: https://www.cnbc.com/2018/10/01/five-crucial-challenges-for-blockchain-to-overcome-deloitte.html
質問 47
Blockchain is always a better alternative to a standard database.
- A. False
- B. True
正解: A
質問 48
What do consensus methods achieve?
- A. The most efficient way of recording a transaction in any database.
- B. Anonymity in a peer to peer network
- C. The highest level of security in a database by ensuring 51% agreement of nodes on the network.
- D. It confirms that all nodes on the network are legitimate.
- E. None of the above
正解: D
質問 49
Blockchain transaction code categorizes the data put into blocks.
- A. False
- B. True
正解: A
質問 50
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実験された試験材料はCBBF：https://www.goshiken.com/Blockchain/CBBF-mondaishu.html