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Blockchain CBSA Practice Test - Questions Answers, Page 10
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Question 91
What are two reasons that you would consider implementing a POW algo in your blockchain? (Select two.)
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
In Hyperledger Fabric, the smart contract logic is also called by two other names _______________ and ______________? (Select two.)
Reference: http://hyperledger-fabric.readthedocs.io/en/release-1.1/Fabric-FAQ.html#endorsement
Question 93
Ethereum has a metric system of denominations used as units of ether. What is the smallest denomination of Ether?
Reference: http://ethdocs.org/en/latest/ether.html
Question 94
When a consensus algo is considered to be "pluggable modularity», what does that mean?
Reference: https://www.ibm.com/developerworks/cloud/library/cl-blockchain-basics-intro-bluemix-trs/index.html
Question 95
The merkle tree contains a full list of the transactions on the blockchain?
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
Which of the following enterprise blockchains have a pluggable framework consensus algo? (Select two.)
Reference: https://www.horsesforsources.com/top-5-blockchain-platforms_031618
Question 97
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?
Reference: https://github.com/trufflesuite/truffle
Question 98
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?
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
Which of the following is NOT considered a token?
LTC is Litecoin and is a crypto. Check Ethereum tokens here: https://etherscan.io/tokens
Question 100
How are "assets" in Hyperledger Fabric represented? (Select two.)
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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