Blockchain CBSA Exam Questions Instant Access

Question 1

Your customer is an enterprise that is focused on financial sectors.

What type of blockchain would this customer likely want specified for their enterprise?

APermissionless

BDecentralized

CHybrid

DPermissioned

Answer : D

Sometimes referred to as ''private'' blockchains, you are required to have some sort of permission to access any or parts of that blockchain. There are a multitude of variants and hybrid permissioned/permissionless blockchains that exist.

Question 2

What are two reasons that you would consider implementing a POW algo in your blockchain? (Select two.)

APoW imposes no limits on actions in the network and therefore can thwart attacks better than other algos due to high cost

BWhat matters is to have large computational power to solve the puzzles and form new blocks over having a financial stake.

CPoW imposes some limits on actions in the network and therefore can thwart attacks better than other algos due to high cost

DThe algo is energy efficient compared to POS and BFT

EThe algo is energy efficient compared to POS and DPOS

Answer : B, C

The main benefits are the anti-DoS attacks defense and low impact of stake on mining possibilities. Defense from DoS attacks. PoW imposes some limits on actions in the network. They need a lot of efforts to be executed. Efficient attack requires a lot of computational power and a lot of time to do the calculations. Therefore, the attack is possible but kind of useless since the costs are too high. Mining possibilities. It doesn't matter how much money you have in your wallet. What matters is to have large computational power to solve the puzzles and form new blocks. Thus, the holders of huge amounts of money are not in charge of making decisions for the entire network.

Question 3

Blockchains are decentralized ledgers which, by definition, are not controlled by a central authority. Due to the value stored in these ledgers, bad actors have huge economic incentives to try and cause faults.

What algo was the original solution to the potentialproblem as specified by Satoshi?

AProof of Stake

BByzantine Fault Tolerance

CProof of Burn

DProof of Work

EDynamic Proof of Stake

Answer : D

The big breakthrough when Bitcoin was invented, was the use of Proof-of-Work as a probabilistic solution to the Byzantine Generals Problem as described in depth by Satoshi Nakamoto.

Question 4

Ownership or partial ownership of an asset can be tracked with which type of token?

AEquity

BUtility

CEthereum

DGame-based

Answer : B

Question 5

Which of the following is true concerning Hyperledger Composer?

AIt's a competing blockchain to Hyperledger Fabric in the Hyperledger suite of tools

BIt's an API layer that sits above Hyperledger Fabric and is required to interact with the Fabric blockchain

CIt's a toolset and framework for easily developing business networks

DIt's a consensus-focused replicable state machine framework for blockchain development

Answer : C

Question 6

If a Proof of Work blockchain such a s Bitcoin or Ethereum changed to a Proof of Stake consensus paradigm, which key component of the Proof of Work process would be eliminated?

AThere would be no need for the miners or nodes to perform a guessing game

BThe need to solve Byzantine Fault Tolerance

CAll fees related to transactions would be removed

DThe blockchain network would no longer have to display public transactions

Answer : A

Question 7

Fabric Ledger has two specific parts. Select answer with the proper two parts.

AState Data, Transactional Data

BState Data, Transaction logs

CLevelIDb, CouchDB

DTransaction Logs, CouchDB

Answer : B

Fabric Ledger has two parts: * State data: Representation of current state of the assets. Asset state data can be changed upon changes to the state of the data. * Transaction Logs: Record of all the transactions (in the order they are received) which modified the state data, and once the data is written it is immutable and cannot be changed.

Blockchain BTA Certified Blockchain Solution Architect CBSA Exam Questions