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Blockchain CBSA Practice Test - Questions Answers, Page 10

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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 91

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

A.
PoW imposes no limits on actions in the network and therefore can thwart attacks better than other algos due to high cost
A.
PoW imposes no limits on actions in the network and therefore can thwart attacks better than other algos due to high cost
Answers
B.
What matters is to have large computational power to solve the puzzles and form new blocks over having a financial stake.
B.
What matters is to have large computational power to solve the puzzles and form new blocks over having a financial stake.
Answers
C.
PoW imposes some limits on actions in the network and therefore can thwart attacks better than other algos due to high cost
C.
PoW imposes some limits on actions in the network and therefore can thwart attacks better than other algos due to high cost
Answers
D.
The algo is energy efficient compared to POS and BFT
D.
The algo is energy efficient compared to POS and BFT
Answers
E.
The algo is energy efficient compared to POS and DPOS
E.
The algo is energy efficient compared to POS and DPOS
Answers
Suggested answer: B, C

Explanation:

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. Reference: https://cointelegraph.com/explained/proof-of-work-explained

Question 92

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In Hyperledger Fabric, the smart contract logic is also called by two other names _______________ and ______________? (Select two.)

A.
CordApps
A.
CordApps
Answers
B.
DApps
B.
DApps
Answers
C.
Programmatic Logic
C.
Programmatic Logic
Answers
D.
Ripple
D.
Ripple
Answers
E.
Chaincode
E.
Chaincode
Answers
F.
Ledger
F.
Ledger
Answers
Suggested answer: C, E

Explanation:

Reference: http://hyperledger-fabric.readthedocs.io/en/release-1.1/Fabric-FAQ.html#endorsement

Question 93

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Ethereum has a metric system of denominations used as units of ether. What is the smallest denomination of Ether?

A.
Kwei
A.
Kwei
Answers
B.
Shannon
B.
Shannon
Answers
C.
Wei
C.
Wei
Answers
D.
Finney
D.
Finney
Answers
Suggested answer: C

Explanation:

Reference: http://ethdocs.org/en/latest/ether.html

Question 94

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When a consensus algo is considered to be "pluggable modularity», what does that mean?

A.
Add permission as needed
A.
Add permission as needed
Answers
B.
Add user as needed
B.
Add user as needed
Answers
C.
Select an optimal algorithm for your networks
C.
Select an optimal algorithm for your networks
Answers
D.
Select a specific API that manages the blockchain
D.
Select a specific API that manages the blockchain
Answers
Suggested answer: C

Explanation:

Reference: https://www.ibm.com/developerworks/cloud/library/cl-blockchain-basics-intro-bluemix-trs/index.html

Question 95

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The merkle tree contains a full list of the transactions on the blockchain?

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

Explanation:

The merkle tree does not contain a list of all the transactions, rather a hash (digital fingerprint) of all transactions as a tree structure. Reference: https:// medium.com/all-things-ledger/bitcoins-implementation-of-blockchain-2be713f662c2

Question 96

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Which of the following enterprise blockchains have a pluggable framework consensus algo? (Select two.)

A.
Quorum
A.
Quorum
Answers
B.
R3 Corda
B.
R3 Corda
Answers
C.
Ethereum
C.
Ethereum
Answers
D.
Hyperledger Fabric
D.
Hyperledger Fabric
Answers
E.
Ripple
E.
Ripple
Answers
Suggested answer: B, C

Explanation:

Reference: https://www.horsesforsources.com/top-5-blockchain-platforms_031618

Question 97

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You are using Truffle for an Ethereum contract and would like to use a default set of contracts and tests from within an empty project directory. What is the syntax?

A.
truffle defaults
A.
truffle defaults
Answers
B.
truffle init
B.
truffle init
Answers
C.
truffle test
C.
truffle test
Answers
D.
truffle compile
D.
truffle compile
Answers
Suggested answer: B

Explanation:

Reference: https://github.com/trufflesuite/truffle

Question 98

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Gas has multiple associated terms with it: Gas Prices, Gas Cost, Gas Limit, and Gas Fees. The principle behind Gas is to have a stable value for how much a transaction or computation costs on the Ethereum network.

Which is considered to be the static value for how much a computation costs in terms of Gas?

A.
Price
A.
Price
Answers
B.
Fee
B.
Fee
Answers
C.
Cost
C.
Cost
Answers
D.
Limit
D.
Limit
Answers
Suggested answer: C

Explanation:

Gas Cost is a static value for how much a computation costs in terms of Gas, and the intent is that the real value of the Gas never changes, so this cost should always stay stable over time Reference: http://ethdocs.org/en/latest/ether.html

Question 99

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Which of the following is NOT considered a token?

A.
ICON
A.
ICON
Answers
B.
LTC
B.
LTC
Answers
C.
Golem
C.
Golem
Answers
D.
EOS
D.
EOS
Answers
Suggested answer: B

Explanation:

LTC is Litecoin and is a crypto. Check Ethereum tokens here: https://etherscan.io/tokens

Question 100

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How are "assets" in Hyperledger Fabric represented? (Select two.)

A.
JSON
A.
JSON
Answers
B.
Node
B.
Node
Answers
C.
YAML
C.
YAML
Answers
D.
Binary
D.
Binary
Answers
E.
Deployment Manager
E.
Deployment Manager
Answers
Suggested answer: A, D

Explanation:

Assets in Hyperledger Fabric are represented in JSON or Binary. Assets are represented in Hyperledger Fabric as a collection of key-value pairs, with state changes recorded as transactions on a Channel ledger. Assets can be represented in binary and/or JSON form.

Reference: https://hyperledger-fabric.readthedocs.io/en/release-1.3/fabric_model.html

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