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Blockchain CBSA Practice Test - Questions Answers, Page 17

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Bitcoin implemented Byzantine Fault Tolerance through a system named:
In common blockchain design, what is one common method to "chain" blocks of data together in order?
A private blockchain like Hyperledger would be the right choice for which scenario:
Blockchains only work to store financial transactions or other exchanges of monetary value.
Which cryptocurrency is also known as "Smart Money" in the blockchain world?
What is the difference in using Go-Ethereum over Ganache?
In Ethereum the difficulty adjustment algorithm is coded in the ___________ file.
What are two challenges with using a Proof of Work algorithm? (Select two.)
Proof of Stake consensus is most often needed for and implemented by:
Consider the following scenario. A startup is building a chat app for smart phones where the messages sent between users are anonymous and get destroyed within 24 hours of being sent. Which architecture would best solve the product need?

Question 161

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Without 100% autonomy, blockchain software and networks would serve little purpose.

A.
FALSE
A.
FALSE
Answers
B.
TRUE
B.
TRUE
Answers
Suggested answer: B

Question 162

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The reason that cryptocurrencies such as Bitcoin, Ethereum and Litecoin can be exchanged one with another is due to the fact that they all operate on the same blockchain network

A.
FALSE
A.
FALSE
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B.
TRUE
B.
TRUE
Answers
Suggested answer: A

Question 163

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The difference between a decentralized and a distributed system is?

A.
A decentralized system is hosted across multiple datacenters
A.
A decentralized system is hosted across multiple datacenters
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B.
Distributed and decentralized are the same thing
B.
Distributed and decentralized are the same thing
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C.
A decentralized system is not wholly owned by a single entity
C.
A decentralized system is not wholly owned by a single entity
Answers
D.
A distributed system is not wholly owned by a single entity
D.
A distributed system is not wholly owned by a single entity
Answers
Suggested answer: C

Explanation:

Reference: https://medium.com/distributed-economy/what-is-the-difference-between-decentralized-and-distributed-systems-f4190a5c6462

Question 164

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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?

A.
There would be no need for the miners or nodes to perform a guessing game
A.
There would be no need for the miners or nodes to perform a guessing game
Answers
B.
The need to solve Byzantine Fault Tolerance
B.
The need to solve Byzantine Fault Tolerance
Answers
C.
All fees related to transactions would be removed
C.
All fees related to transactions would be removed
Answers
D.
The blockchain network would no longer have to display public transactions
D.
The blockchain network would no longer have to display public transactions
Answers
Suggested answer: A

Explanation:

Reference: https://blockgeeks.com/guides/proof-of-work-vs-proof-of-stake/

Question 165

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Which factor influences the gas cost to deploy a Smart Contact on the Ethereum blockchain?

A.
None. Smart Contract deployment has a fixed gas cost
A.
None. Smart Contract deployment has a fixed gas cost
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B.
The types of operations written in code within the Smart Contract
B.
The types of operations written in code within the Smart Contract
Answers
C.
The current Ethereum market conditions
C.
The current Ethereum market conditions
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D.
The total size of the complied Smart Contract measured in kilobytes
D.
The total size of the complied Smart Contract measured in kilobytes
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Suggested answer: D

Question 166

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By design, permissioned blockchains such as Hyperledger Fabric are not capable of creating or utilizing cryptocurrency.

A.
FALSE
A.
FALSE
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B.
TRUE
B.
TRUE
Answers
Suggested answer: A

Question 167

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How does a client app communicate with Hyperledger fabric chaincode (Smart Contracts)?

A.
The app uses an SDK which invokes functionality on the chaincode which then announces the transaction to any peers required to endorse the transaction
A.
The app uses an SDK which invokes functionality on the chaincode which then announces the transaction to any peers required to endorse the transaction
Answers
B.
The app uses Hyperledger Composer to communicate with CouchDB which in turn invokes chaincode functionality
B.
The app uses Hyperledger Composer to communicate with CouchDB which in turn invokes chaincode functionality
Answers
C.
Client apps don't communicate with Hyperledger fabric directly, they must use Hyperledger Composer for the transmission
C.
Client apps don't communicate with Hyperledger fabric directly, they must use Hyperledger Composer for the transmission
Answers
D.
The app points to a node's IP address, then calls an invoke function on the chaincode address to start the write process
D.
The app points to a node's IP address, then calls an invoke function on the chaincode address to start the write process
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Suggested answer: A

Question 168

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On the Ethereum blockchain the "nonce" of a transaction:

A.
Holds the gas amount to be paid to the miner writing the block that contains the transaction
A.
Holds the gas amount to be paid to the miner writing the block that contains the transaction
Answers
B.
Is used to ensure that transactions by a given account are written in sequential order
B.
Is used to ensure that transactions by a given account are written in sequential order
Answers
C.
Is reset to zero after each successfully mined blocked
C.
Is reset to zero after each successfully mined blocked
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D.
Must always start with four zeroes
D.
Must always start with four zeroes
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Suggested answer: B

Question 169

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To interact with a deployed Ethereum Smart Contract, a user or app must:

A.
Have a reference to the public address of the deployed Smart Contract
A.
Have a reference to the public address of the deployed Smart Contract
Answers
B.
Have the appropriate permissions needed to invoke the functions of the Smart Contract
B.
Have the appropriate permissions needed to invoke the functions of the Smart Contract
Answers
C.
Have sufficient gas to perform read and write operations against the Smart Contract
C.
Have sufficient gas to perform read and write operations against the Smart Contract
Answers
D.
All of the above
D.
All of the above
Answers
Suggested answer: A

Explanation:

Reference: https://ethereum.stackexchange.com/questions/25605/how-to-interact-with-a-deployed-smart-contract-in-the-real-world

Question 170

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One critical business consideration you must account for when choosing Hyperledger Fabric over Ethereum is:

A.
Who you will have host the nodes and how will you deploy the network
A.
Who you will have host the nodes and how will you deploy the network
Answers
B.
If your blockchain will use Proof of Work or Proof of Stake
B.
If your blockchain will use Proof of Work or Proof of Stake
Answers
C.
Which cryptographic algorithms Hyperledger Fabric employs
C.
Which cryptographic algorithms Hyperledger Fabric employs
Answers
D.
How you will implement your own gas/fee system
D.
How you will implement your own gas/fee system
Answers
Suggested answer: A
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