Ethereum's Transactions, Validation, and Upgrades BDC Practice Questions (Page 6)

Questions 26–30

1. 26foundation · easy

   What is the role of an Ethereum Improvement Proposal (EIP) in the upgrade process?

   • AIt is a hard fork that changes the blockchain
   • BIt is a legal contract that binds all Ethereum users
   • CIt is a formal document that describes a proposed change to the Ethereum protocol
   • DIt is a software update that is automatically applied to all nodes
   Reveal Solution Discussion Select an answer first
2. 27foundation · easy

   Which cryptographic algorithm is used to sign Ethereum transactions?

   • ARSA (Rivest-Shamir-Adleman)
   • BSHA-256 (Secure Hash Algorithm)
   • CAES (Advanced Encryption Standard)
   • DECDSA (Elliptic Curve Digital Signature Algorithm)
   Reveal Solution Discussion Select an answer first
4. 28application · medium

   A developer needs to deploy a new smart contract to Ethereum. Which transaction type should they create, and what distinguishes it from a regular value transfer?

   • AA regular transaction with the 'to' field set to zero address and the data field containing the ABI.
   • BA regular transaction with the 'to' field set to the contract address and the data field containing the constructor arguments.
   • CA contract creation transaction with an empty 'to' field and the compiled bytecode in the data field.
   • DAn internal transaction (message call) triggered by another contract's execution.
   Reveal Solution Discussion Select an answer first
5. 29foundation · easy

   After The Merge, what replaced the proof-of-work mining process for producing new blocks?

   • AValidators staking ETH and being selected to propose blocks
   • BMiners solving complex mathematical puzzles
   • CA centralized authority creating blocks
   • DA random lottery among all Ethereum users
   Reveal Solution Discussion Select an answer first
6. 30expert · medium

   After The Merge, a developer notices that their transaction is included in a block, but the block is later reorged. Which of the following best explains why this can happen under Proof of Stake?

   • AThe transaction was invalid, so the block was reorged.
   • BThe base fee increased, making the transaction unprofitable, so the block was reorged.
   • CThe block proposer was slashed for equivocation, causing the block to be removed.
   • DAnother validator produced a competing block that received more attestations, causing the chain to switch to that block.
   Reveal Solution Discussion Select an answer first