Blockchain CBDE Exam Questions Instant Access

Question 1

A version pragma is a great way to make it clear:

Afor which compiler version a smart contract was developed for. It helps to avoid breaking changes.

Bfor which blockchain a smart contract was developed for. It helps to avoid confusion with beta-customers.

Cfor which blockchain node a smart contract was developed for. It helps to avoid mixing up different versions of go-ethereum.

Answer : A

Question 2

Importing from GitHub:

Aworks across all compilers and platforms the same way.

Bis generally possible, but currently works only in Remix, but doesn't work in Truffle.

Answer : B

Question 3

To communicate with an Ethereum node via JavaScript:

Athe library you use must make use of the JSON-RPC Interface of an Ethereum Node.

Bmust Implement the Ethereum Protocol to connect to other Ethereum Nodes.

Cmust use Web3.js, which is closed source to communicate to other Ethereum Nodes.

Answer : A

Question 4

Consensus is reached:

Aby the miner nodes which make sure that a transaction is valid.

Bby every single node in the blockchain network executing the same transaction.

Cby a cryptographic secure signature algorithm called ECDSA which makes sure that cheating is impossible.

Answer : B

Question 5

What are Private Keys used for?

ATo Protect the Public Keys by being cryptographically significant.

BTo Sign Transactions And To Derive an Address From.

CTo Generate An Address which can sign transactions.

Answer : B

Question 6

What's the difference between Ethereum Request for Comments (ERC) and Ethereum Improvement Proposals (EIP)?

AERC are here to define standards for the usage of Ethereum. EIP are here to improve the Ethereum Protocol itself.

BERC are here to propose new distributed applications on top of the Ethereum layer, while EIP are here to improve existing mining software.

CERC are an open platform to discuss continuous forking of the Ethereum platform. Successful forks are then incorporated in the EIP for further voting by the Ethereum Consortium.

Answer : A

Question 7

A Private Network is:

Aa side Channel to the Ethereum Main Net which costs less gas to run smart contracts.

Ban exact clone of the Rinkeby Test-Network which can be started as virtual machine in the Azure Cloud.

Ca Network running only in a private area, where people cannot join freely and openly.

Answer : C

Blockchain BTA Certified Blockchain Developer - Ethereum CBDE Exam Questions