File Info
| Exam | Certified Blockchain Business Foundations |
| Number | CBBF |
| File Name | Blockchain.CBBF.TestKing.2019-06-06.33q.vcex |
| Size | 17 KB |
| Posted | Jun 06, 2019 |
| Download | Blockchain.CBBF.TestKing.2019-06-06.33q.vcex |
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Demo Questions
Question 1
Transparency allows_____________.
- a trustless system where users can be certain of a result
- easy iteration through the Blockchain
- Records on the Blockchain to never be changed
- users on the Blockchain to change data on the Blockchain
Correct answer: A
Explanation:
Reference: https://lisk.io/academy/blockchain-basics/benefits-of-blockchain/why-is-blockchain-trustless Reference: https://lisk.io/academy/blockchain-basics/benefits-of-blockchain/why-is-blockchain-trustless
Question 2
Blockchain is always a better alternative to a standard database.
- True
- False
Correct answer: B
Explanation:
Reference: https://www.coindesk.com/information/what-is-the-difference-blockchain-and-database Reference: https://www.coindesk.com/information/what-is-the-difference-blockchain-and-database
Question 3
How does a private Blockchain differ from a public one? Select all that apply.
- A private Blockchain does not use proof of work consensus
- A private Blockchain is more efficient and has faster transaction times
- A private Blockchain is not distributed
- A private Blockchain often requires the identity of users to be known
Correct answer: D
Explanation:
Reference: https://medium.com/coinmonks/public-vs-private-blockchain-in-a-nutshell-c9fe284fa39f Reference: https://medium.com/coinmonks/public-vs-private-blockchain-in-a-nutshell-c9fe284fa39f
Question 4
Blockchains work best when they are____________________.
- combined with other technologies
- used for financial applications
- used alone
- used as an alternative to a database
Correct answer: B
Question 5
What is a hash function?
- A one-way function that converts input to a unique string output
- A function that stores data behind a key
- A two-way function used for condensing information
- The block-ID of the block
- All the above
Correct answer: D
Question 6
Which of the following are practical use cases for Blockchain?
- Voting
- A video sharing website
- Medical records
- Identity management
- All of the above
Correct answer: E
Explanation:
Reference: https://www.mycryptopedia.com/16-promising-blockchain-use-cases/ Reference: https://www.mycryptopedia.com/16-promising-blockchain-use-cases/
Question 7
Which item(s) make up a block header?
- The hash of the Merkle root and the header of the previous block
- The hash of every transaction in a specific block and the next block
- The time stamp of the block and the genesis block hash
- The hash of the previous block
Correct answer: D
Explanation:
Reference: https://www.cryptocompare.com/coins/guides/what-is-a-block-header-in-bitcoin/ Reference: https://www.cryptocompare.com/coins/guides/what-is-a-block-header-in-bitcoin/
Question 8
How is Blockchain benefiting voting?
- By revealing the identity of each voter and who or what they voted for
- By controlling who gets to vote
- By only allowing a certain number of votes per person
- By allowing voters to trust their vote has been counted
Correct answer: D
Question 9
Which of the following statements sums up the Proof of Work consensus process?
- Miners complete to find a nonce results in a hash that starts with a predetermined number of leading zeros.
- 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.
- All nodes agree on the data of the transaction.
- Miners send assets to an inactive address. This process selects the next owner of a block.
Correct answer: C
Explanation:
Reference: https://www.nichanank.com/blog/2018/5/23/consensus-algorithms-pow Reference: https://www.nichanank.com/blog/2018/5/23/consensus-algorithms-pow
Question 10
Blockchain applications can provide____________________.
- the elimination of intermediaries
- building more trust between trusted parties
- collaboration between trusted parties
- better cooperation between banks
Correct answer: A
