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Exam contains 99 questions

Page 5 of 17

Question 25 🔥

Block Difficulty:

Which database solution meets these requirements?

A. is determined by the Ethereum Committee every fortnight to reflect the average amount of transaction and it cannot be influenced by the network itself.

Highly voted

B. increases when the time between mined blocks is below 10 seconds, while it decreases when the time is above 20 seconds.

Highly voted

C. increases when the time between mined blocks is below 20 seconds, while it decreases when the time is above 60 seconds.

Highly voted

Discussion of the question

Question 26 🔥

Ethereum Nodes:

Which database solution meets these requirements?

A. must implement the Ethereum protocol and external access can only be done via the proprietary Ethereum Libraries like Web3.js.

Highly voted

B. must implement the Ethereum Protocol and a JSON-RPC to talk with clients.

Highly voted

C. must implement Web3.js to interact with Websites.

Highly voted

Discussion of the question

Question 27 🔥

When a new block is mined:

Which database solution meets these requirements?

A. a list of transactions as well as uncles is incorporated in the block. All gas that is used during those transactions is added to the miners' balance. Also, the block reward is added to the miner. Then the same transactions are run again by every participating node in the network to achieve consensus.

Highly voted

B. a list of transactions is incorporated in that block. Gas used during the execution is attached to the executing contracts while the block reward is automatically spread across the mining pool to ensure a fair spread. Consensus is reached by a special form of hash code.

Highly voted

Discussion of the question

Question 28 🔥

A Blockchain Node:

Which database solution meets these requirements?

A. can never become a mining node.

Highly voted

B. can always become a mining node.

Highly voted

C. can become a mining node, depending if the implementation has the functionality implemented.

Highly voted

Discussion of the question

Question 29 🔥

On a consortium network:

Which database solution meets these requirements?

A. everybody can become a miner, everybody can send transactions and everything is public.

Highly voted

B. usually only a few selected nodes can be miners. Transactions can be further limited.

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Discussion of the question

Question 30 🔥

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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