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Blockchain CBDE dumps - 100% Pass Guarantee!

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Vendor: Blockchain

Certifications: Blockchain Other Certification

Exam Name: BTA Certified Blockchain Developer - Ethereum

Exam Code: CBDE

Total Questions: 102 Q&As ( View Details)

Last Updated:

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CBDE Q&A's Detail

Exam Code: CBDE
Total Questions: 102
Single & Multiple Choice 102

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CBDE Online Practice Questions and Answers

Questions 1

Function and Variable Visibility:

A. a function that is marked as internal cannot be called by other contracts, unless the function is used by a derived contract. Private Functions cannot be called by any other outside contract and public variables are generating automatically a getter function.

B. a function that is marked as external can never be called internally. Private functions can also be called by derived contracts using inheritance. Private variables are accessible also in derived contracts.

Show Answer
Questions 2

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

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.

Show Answer
Questions 3

If you need more fine-grained functionality than solidity offers out of the box:

A. you can incorporate inline-assembly to get better controls.

B. you have to import pre-compiled assembly files which are then hard-copied into the bytecode of the compiled solidity file.

C. you can use Viper, the experimental assembly like language specifically to offer more flexibility.

Show Answer
Questions 4

Truffle:

A. is a framework that helps developers with Testing, Deployment and Management of Smart Contracts and Distributed Applications.

B. is a library that helps developers to connect to Ethereum nodes, because it abstracts the JSONRPC interface.

C. is a framework for Java, similar to Web3.js for JavaScript. It's a great way to develop distributed Java enterprise applications.

Show Answer
Questions 5

With the truffle config file you can manage:

A. the amount of gas your contract deployment and transactions, against your contract, will need. This way you can essentially lower the gas costs over traditional web3.js dApps.

B. different Networks to deploy your contracts to. This way you can easily deploy to a local blockchain, the main-net or the Ropsten/Rinkeby Test-Net with only one parameter.

C. you can manage your secret API keys to the Ethereum Network. This way you can get access to several different Ethereum nodes at the same time without the need to switch your keyfiles.

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