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CBDE Exam Dumps : BTA Certified Blockchain Developer - Ethereum

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BTA Certified Blockchain Developer - Ethereum Questions and Answers

Question 1

The difference between address.send() and address.transfer() is:

Options:

A.

.send returns a Boolean and .transfer throws an exception on error. Both just forward the gasstipend of 2300 gas and are considered safe against re-entrancy.

B.

.send throws an exception and .transfer returns a Boolean on error. Both just forward the gasstipend of 2300 gas and considered safe against re-entrancy

C.

.send returns a Boolean and .transfer throws an exception on error. .send is considered dangerous, because it sends all gas along, while .transfer only sends the gas stipend of 2300 gas along

D.

.send and .transfer are both considered low-level functions which are dangerous, because they send all gas along. It's better to use address.call.value()() to control the gas-amount.

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Question 2

Truffle has an integrated in-memory blockchain which makes unit-testing very easy:

Options:

A.

True, but it's still good to use Ganache, or even a real private network for testing.

B.

False, it's necessary to use Ganache or even a real private network for testing.

Question 3

What are Ethereum Nodes?

Options:

A.

Programs implementing the Ethereum Protocol to talk to each other and JSON-RPC interfaces to talk to the outside world.

B.

A Java-Script library to compile and run Solidity Code.

C.

A Framework for deploying and running smart contract in a decentralized way.