Blockchain Blockchain Other Certification CBBF Questions & Answers

• Question 11:

  Where is a Blockchain's central server?

  A. Where the Blockchain is created

  B. Located with the owner of the server

  C. There is no central server, it is distributed

  D. Orderer Node

  E. None of the above

  Correct Answer: C

• Question 12:

  What do consensus methods achieve?

  A. Anonymity in a peer to peer network

  B. The highest level of security in a database by ensuring 51% agreement of nodes on the network.

  C. The most efficient way of recording a transaction in any database.

  D. It confirms that all nodes on the network are legitimate.

  E. None of the above

  Correct Answer: D

• Question 13:

  Who governs a Blockchain?

  A. The users

  B. The architects

  C. The creator of the Blockchain

  D. The developers

  Correct Answer: A

• Question 14:

  Blockchains are being implemented in the food supply chain because ____________.

  A. Consumers demand to know where their food comes from

  B. It allows farm to table accountability for safety

  C. They have the potential to provide fast, specific supplier data

  D. It prevents food waste if a food contamination problem occurs.

  E. All of the above

  Correct Answer: E

• Question 15:

  Transactions per second (TPS) for a Proof-of-Work Blockchain are approximately?

  A. 24K per second

  B. 175K per second

  C. Only limited to the number of nodes on the network

  D. 7-15 per second

  E. None of the above

  Correct Answer: D

  Reference: https://www.investinblockchain.com/transactions-per-second-and-consensus-mechanisms-ofthe-top-50-cryptocurrencies/

• Question 16:

  Who can read records on a public Blockchain?

  A. Everyone on the Blockchain

  B. No one

  C. Only the creator

  D. The users with access permissions

  E. None of the above

  Correct Answer: A

• Question 17:

  The height of a block is the______________ in the chain between it and the genesis block.

  A. metadata that is

  B. number of blocks

  C. Merkle tree hash

  D. size of the memory cache

  Correct Answer: B

  Reference: https://www.mycryptopedia.com/genesis-block-explained/

• Question 18:

  What happens if a block is confirmed at the same time?

  A. The blocks splits into two chains. Blocks are then added to each chain until one chain becomes larger. The longest chain is then considered to be the Blockchain.

  B. Nodes select which block to be added to the Blockchain

  C. Both chains are deleted, and the unconfirmed transactions are added back to the pool

  D. The Orderer Block confirms which block has the most confirmed transactions

  E. None of the above

  Correct Answer: B

• Question 19:

  One of Blockchain's primary uses of cryptography is___________.

  A. keeping the network configuration a secret

  B. providing a public and private encryption key

  C. allowing users to communicate with each other anonymously

  D. keeping the I.P. addresses a secret

  Correct Answer: B

• Question 20:

  Which of the following problems did Blockchain solve for cryptocurrencies?

  A. Anonymity

  B. Double Spending

  C. Destination of currencies

  D. None of the above

  Correct Answer: A