Blockchain CBDE Exam Actual Questions

Name: BTA Certified Blockchain Developer - Ethereum
Brand: QA4Exam
SKU: CBDE
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The questions for CBDE were last updated on Oct 1, 2024.

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Question No. 1

When you are programming a game like poker of battleships where you need to hide opponents values is:

Awith private state variables. This way nobody else other than the smart contract itself can see the information

Bwith external contracts holding those values. This way we can make sure that the information flow is following a clear logic and nobody else can access this information.

CYou can't hide anything on the blockchain, because the information is public, just the call is private which means only other smart contracts would be limited in accessing that information.

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Correct Answer: C

Question No. 2

When considering smart contracts and the blockchain it's good:

Ato move all existing logic to the blockchain, so everything runs on the same system. This way it might be more complex, but easier to maintain.

Bto move only those parts to the blockchain that really need the blockchain. This way smart contracts can be easier to read, easier to test and are not so complex.

Cto move those parts to the blockchain that deal with Ether transfers. All other parts can remain in traditional database systems. This way only the value-transfer is on the blockchain.

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Correct Answer: B

Question No. 3

When a smart contract pays out money:

Ait's good to use a push over a pull method.

Bit's good to use a push and a pull method to ensure that participants can get their money no matter the contract state. In addition to and pushing it should contain a withdraw method.

Cit's good to use only pull and no push method.

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Correct Answer: B

Question No. 4

To develop smart contracts:

Ait's good to start with a local in-memory blockchain with unit tests but then deploy to the mainnet as rapidly as possible.

Bit's good to start with a local in-memory blockchain with unit-tests. Then, in the next step, debug and test the smart contract on a test-net like Ropsten or Rinkeby with beta customers to iron out last issues before deploying it to the main-net.

Cit's good to start with a test-net with beta-customers like on the Rinkeby or Ropsten testnet, before testing it locally on an in-memory blockchain simulation such as Ganache. Then deploy it to the main-net.

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Correct Answer: B

Question No. 5

To avoid issues during Ethereum platform upgrades:

Ait's good to inform users about the updates via a newsletter.

Bit's good to have the ability to pause a contract in order to manage the money at risk.

CEthereum doesn't upgrade the platform. It's fixed and final.

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Correct Answer: B

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