Blockchain Blockchain Solution Architect CBSA Questions & Answers

• Question 21:

  It is impossible to persist media types such as MP3 and MOV on any distributed ledger.

  A. FALSE

  B. TRUE

  Correct Answer: A

• Question 22:

  To approve pending ledger transactions, consensus algorithms often implement:

  A. Byzantine Fault Tolerance

  B. Access Control

  C. Kerckhoffs's Principle

  D. Common Weakness Enumeration

  Correct Answer: A

  Reference: https://applicature.com/blog/crypto-enthusiasts/bitcoin-transaction

• Question 23:

  Which one of the following is true regarding Smart Contracts on the Ethereum blockchain?

  A. They provide added security over off-chain transaction code on other blockchain networks

  B. Because they are compiled into bytecode they cannot be used in an unintended manner

  C. Any flaw discovered in their code can quickly be updated and redeployed

  D. They are Turing complete and deterministic in nature

  Correct Answer: D

  Reference: https://blockgeeks.com/guides/different-smart-contract-platforms/

• Question 24:

  In public key cryptography, the public key is used to:

  A. Sign/approve any transaction/action that might be made by the holder of the key pair

  B. Verify the digital signature of a given key pair

  C. Decrypt the private key so valid transactions/actions can be performed

  D. Encrypt the private key

  Correct Answer: D

  Reference: https://www.globalsign.com/en/ssl-information-center/what-is-public-key-cryptography/

• Question 25:

  A Smart Contract is most like which classical programming object?

  A. Class

  B. Variable

  C. Method

  D. Function

  Correct Answer: D

• Question 26:

  How are blocks of data "chained" together to ensure the integrity of transactions?

  A. The hash of the previous block is written to the header of the current block

  B. The ID of the previous block is stored in the current block

  C. A public key is stored in each block for data decryption

  D. The hash of the genesis block is kept in all block headers

  Correct Answer: A

• Question 27:

  Byzantine Fault Tolerance can be achieved only through a Proof of Work.

  A. FALSE

  B. TRUE

  Correct Answer: A

• Question 28:

  Which scenario would it be most appropriate for a blockchain solution to implement a Proof of Work or Proof of Stake consensus?

  A. When the blockchain needs to be permissioned

  B. When the aim of the blockchain is to be a trustless as possible

  C. When the blockchain needs to support millions of transactions

  D. All of the above

  Correct Answer: B

• Question 29:

  Complex application components should try to be concentrated in which application layer?

  A. Interface layer / middle

  B. Presentation / top

  C. Smart Contract / bottom

  D. None of the above

  Correct Answer: B

• Question 30:

  When a blockchain software is updated with new functionality that breaks or modifies the rules of the previous version of the software, what has just occurred?

  A. A hard fork

  B. Revision Reversal Attack

  C. A software fault

  D. Autonomous update consensus

  Correct Answer: A