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Exam contains 99 questions

Page 6 of 17

Question 31 🔥

GETH:

Which database solution meets these requirements?

A. is the reference implementation of the Ethereum protocol and every other node implementation internally uses the closed-source from Geth.

Highly voted

B. is the library that is used for the blockchain node Go-Ethereum. It is also used by Parity is parts, because it's closed source.

Highly voted

C. is one of the many blockchain nodes that implement the Ethereum Protocol. It's open source and everyone can contribute.

Highly voted

Discussion of the question

Question 32 🔥

To store almost all data in the Ethereum Blockchain:

Which database solution meets these requirements?

C. a Radix Trie is used because the Merkle Patricia Trie is too inefficient.

Highly voted

A. a Linked List with pointers to previous blocks hashes is used.

Highly voted

B. a Merkle Patricia Trie is used.

Highly voted

Discussion of the question

Question 33 🔥

You interact with a smart contract and see a gas usage of 50,000 gas with a gas cost of 15Gwei.How much Ether would you have to pay to the miner?

Which database solution meets these requirements?

A. 750,000,000,000,000 Wei

Highly voted

B. 750,000,000,000 Wei

Highly voted

C. 750,000,000 Wei

Highly voted

D. A flat fee of 1 Ether

Highly voted

Discussion of the question

Question 34 🔥

Checking the balance of an address inside a loop of a smart contract constantly:

Which database solution meets these requirements?

A. doesn't cost any gas.

Highly voted

B. cost gas every time we check the balance.

Highly voted

Discussion of the question

Question 35 🔥

Gas costs accrue on sending a transaction:

Which database solution meets these requirements?

A. no matter the content.

Highly voted

B. only with a new smart contract deployment.

Highly voted

C. only interacting with an already deployed smart contract.

Highly voted

Discussion of the question

Question 36 🔥

Consensus is reached:

Which database solution meets these requirements?

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

Highly voted

B. by every single node in the blockchain network executing the same transaction.

Highly voted

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

Highly voted

Discussion of the question

Ready to Pass Your Certification Test

blockchain CBDE

Exam contains 99 questions

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