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Free CBDE Exam Braindumps (page: 9)

Page 8 of 26
PDF with 102 Questions

Block Difficulty:

  1. is determined by the Ethereum Committee every fortnight to reflect the average amount of transaction and it cannot be influenced by the network itself.
  2. increases when the time between mined blocks is below 10 seconds, while it decreases when the time is above 20 seconds.
  3. increases when the time between mined blocks is below 20 seconds, while it decreases when the time is above 60 seconds.

Answer(s): B



Ethereum Nodes:

  1. must implement the Ethereum protocol and external access can only be done via the proprietary Ethereum Libraries like Web3.js.
  2. must implement the Ethereum Protocol and a JSON-RPC to talk with clients.
  3. must implement Web3.js to interact with Websites.

Answer(s): B



When a new block is mined:

  1. 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.
  2. 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.

Answer(s): A



A Blockchain Node:

  1. can never become a mining node.
  2. can always become a mining node.
  3. can become a mining node, depending if the implementation has the functionality implemented.

Answer(s): C






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