What are two reasons that you would consider implementing a POW algo in your blockchain? (Select two.)
Answer(s): 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.
https://cointelegraph.com/explained/proof-of-work-explained
In Hyperledger Fabric, the smart contract logic is also called by two other names ____________and ____________? (Select two.)
Answer(s): C,E
http://hyperledger-fabric.readthedocs.io/en/release-1.1/Fabric-FAQ.html#endorsement
Ethereum has a metric system of denominations used as units of ether. What is the smallest denomination of Ether?
Answer(s): C
When a consensus algo is considered to be "pluggable modularity», what does that mean?
https://www.ibm.com/developerworks/cloud/library/cl-blockchain-basics-intro-bluemix-trs/index.html
The merkle tree contains a full list of the transactions on the blockchain?
Answer(s): A
The merkle tree does not contain a list of all the transactions, rather a hash (digital fingerprint) of all transactions as a tree structure.
https://medium.com/all-things-ledger/bitcoins-implementation-of-blockchain-2be713f662c2
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