Download Blockchain.CBDE.BrainDumps.2019-10-29.61q.vcex

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Exam BTA Certified Blockchain Developer - Ethereum
Number CBDE
File Name Blockchain.CBDE.BrainDumps.2019-10-29.61q.vcex
Size 31 KB
Posted Oct 29, 2019
Download Blockchain.CBDE.BrainDumps.2019-10-29.61q.vcex

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Demo Questions

Question 1

Consensus is reached:

  1. by the miner nodes which make sure that a transaction is valid.
  2. by every single node in the blockchain network executing the same transaction.
  3. by a cryptographic secure signature algorithm called ECDSA which makes sure that cheating is impossible.
Correct answer: B

Question 2

Having a bug-bounty program early on:

  1. can help to engage the community in testing your smart contracts and therefore help to find bugs early.
  2. might be a burden as it is an administrative overhead mainly.
  3. is completely useless. Who wants to test beta-ware software? It’s better to start with the bug-bounty program after the contract is released on the main-net.
Correct answer: A

Question 3

Which is the right order for Denominations?

  1. Wei, Finney, Szabo, Ether, Tether.
  2. Finney, Szabo, Mether, Gwei.
  3. Gwei, Szabo, Finney, Ether.
Correct answer: C

Question 4

Which statement is true about the EVM?

  1. While the EVM is Sandboxed, it isn't as powerful as the Bitcoin Network, because it's not Turing Complete.
  2. The EVM can't access hardware layers or anything outside a blockchain node because it's sandboxed.
  3. The EVM is extremely powerful, turing complete and perfect for doing computational intensive things, because of the direct access to the graphics card.
Correct answer: C

Question 5

To get most out of the blockchain, it is best:

  1. to use it for the whole business logic. It’s always best to have everything in once place.
  2. to use it only for things which need the benefits of the blockchain.
Correct answer: B

Question 6

A Hashing Algorithm is deterministic. What does it mean?

  1. it always produces the same output given the same input.
  2. it uses equally distributed data to produce the output given a long input.
  3. it shouldn't be possible to re-generate the input given the output.
Correct answer: A

Question 7

What's the correct scientific notation?

  1. 1 Ether = 10^18 wei, 10^9 Gwei, 10^3 Finney
  2. 1 Ether = 10^19 wei, 10^13 Gwei, 10^3 Finney
  3. 1 Ether = 10^16 wei, 10^13 Gwei, 10^3 Finney
  4. 1 Ether = 10^18 wei, 10^6 Gwei, 10^6 Finney
Correct answer: A

Question 8

What are Private Keys used for?

  1. To Protect the Public Keys by being cryptographically significant.
  2. To Sign Transactions And To Derive an Address From.
  3. To Generate An Address which can sign transactions.
Correct answer: B

Question 9

Proof of Work (PoW) vs. Proof of Stake.

  1. PoW is computationally intensive which requires lots of energy. On the other hand, miners earn straightforward a reward for mining a block and incorporating transactions.
  2. PoW is better than PoS, because with PoS we increase the amount of energy spent on the network.
  3. PoS is mining with specialized new hardware that has to be purchased with a stack of Ether in the network. Hence the Name: Proof of Stake, which derives from Stack.
Correct answer: A

Question 10

Transactions containing the same data to create the same smart contract are:

  1. always having the same signature.
  2. having a different signature because of the nonce which changes upon every transaction.
Correct answer: B





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