Looking the graph below, what type of an attack is this likely?
Answer(s): B
A proof of work system is vulnerable to a particular type of attack called the “P+ epsilon attack”. In order to understand how this attack works we must define some terms before hand. Un-Coordinated Choice Model: An uncoordinated choice model is a model where all the participants don’t have the incentive to work with one another. The participants may form groups but at no time is the group big enough to become a majority.
https://blockgeeks.com/guides/hypothetical-attacks-on-cryptocurrencies/
What does the 20 in ERC20 mean or relate to?
Answer(s): D
ERC stands for Ethereum Request for Comments. This is an official protocol for proposing improvements to the Ethereum network. '20’ is the unique proposal ID number.
https://support.exodus.io/article/108-what-is-an-erc20-token-and-does-exodus-support-it
You are considering writing a smart contract for Ethereum and would like to use a robust programming language.Which programming language is considered the most flexible and robust for Ethereum?
Answer(s): A
To write smart contracts there are a few different languages: Solidity, which is like JavaScript and has .sol as a file extension, Serpent, Python-like with extension .se, and a 3rd, LLL, based on Lisp. Serpent was popular a while back but Solidity is the most popular right now and more robust, so just use Solidity. You prefer Python? Use Solidity.
https://medium.com/@ConsenSys/a-101-noob-intro-to-programming-smart-contracts-on-ethereum-695d15c1dab4
How many peers in the network need to endorse a transaction in a Hyperledger Fabric blockchain?
The number of peers required to endorse a transaction is driven by the endorsement policy that is specified at chaincode deployment time.
http://hyperledger-fabric.readthedocs.io/en/release-1.1/Fabric-FAQ.html#endorsement
Every node needs to keep track of time AND it needs to be in synch with its other peer nodes on the blockchain. In Bitcoin for example the current median for time is around?
The median time differs by more than 70 mins from its system time
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