CBDE

To communicate with an Ethereum node via JavaScript:A . the library you use must make use of the JSON-RPC Interface of an Ethereum Node.B . must Implement the Ethereum Protocol to connect to other Ethereum Nodes.C . must use Web3.js, which is closed source to communicate to other Ethereum Nodes.View...

A Private Network is:A . a side Channel to the Ethereum Main Net which costs less gas to run smart contracts.B . an exact clone of the Rinkeby Test-Network which can be started as virtual machine in the Azure Cloud.C . a Network running only in a private area, where...

PoS:A . would be better, because it can reduce the amount of energy needed for mining.B . would be worse, because it would increase the amount of energy needed for mining.View AnswerAnswer: A

Ethereum Nodes:A . must implement the Ethereum protocol and external access can only be done via the proprietary Ethereum Libraries like Web3.js.B . must implement the Ethereum Protocol and a JSON-RPC to talk with clients.C . must implement Web3.js to interact with Websites.View AnswerAnswer: B

Smart Contracts: A. are always living on the same address, because the blockchain is deterministic. So, one account can always have one smart contract. B. are having the same address as the EOA. C. are sitting on their own address. The Address is created from the nonce and the EOA...

What's the correct scientific notation?A . 1 Ether = 10^18 wei, 10^9 Gwei, 10^3 FinneyB . 1 Ether = 10^19 wei, 10^13 Gwei, 10^3 FinneyC . 1 Ether = 10^16 wei, 10^13 Gwei, 10^3 FinneyD . 1 Ether = 10^18 wei, 10^6 Gwei, 10^6 FinneyView AnswerAnswer: A

Public Keys vs. Private Keys. Which statement is true?A . The Public Key is for Signing Transactions, the Private Key must be given out to verify the signature.B . The Private Key signs transactions, the Public Key can verify the signature.C . The Private Key is to generate a Public...

DApps are:A . great, because they cut the middle man, run on a trusted platform, apply logic to the blockchain where already economic assets are running and thus allow peer to peer trade.B . an amazing way to create new applications. Those applications run entirely separated from other applications on...

It’s possible to access the blockchain via an Ethereum Node:A . only via JavaScript because there is the proprietary Web3.js library.B . by any programming language, as long as it adheres to the JSON-RPC standard.View AnswerAnswer: B

The nonce-field in a transaction is used:A . to protect against replay attacks.B . to have an additional checksum for transactions.C . to sum up all ethers sent from that address.View AnswerAnswer: A