Ethereum Architecture and Transaction Lifecycle BBLC Practice Questions (Page 9)

Questions 41–45

1. 41application · medium

   A user submits a transaction to a public Ethereum node. The node validates the signature and nonce, then broadcasts it to the network. Later, the transaction appears in a block. Which step in the lifecycle occurs AFTER the transaction is included in a block?

   • AThe transaction is propagated to other nodes via the gossip protocol.
   • BThe transaction is executed by the EVM and a receipt is generated.
   • CThe transaction is validated against the sender's nonce and balance.
   • DThe transaction is signed by the sender's private key.
   Reveal Solution Discussion Select an answer first
2. 42expert · hard

   A user submits two transactions from the same EOA: Transaction A with nonce 1 and Transaction B with nonce 2. Transaction A has a lower gas price than Transaction B. What is the most likely outcome?

   • ATransaction B will be included first because it has a higher gas price.
   • BTransaction A will be dropped, and Transaction B will be processed.
   • CTransaction A must be included before Transaction B, regardless of gas price.
   • DBoth transactions will be included in the same block in any order.
   Reveal Solution Discussion Select an answer first
4. 43foundation · easy

   At which stage of the transaction lifecycle does a transaction become irreversible (or practically irreversible) on Ethereum?

   • AAs soon as it is broadcast to the network
   • BAfter it is included in a block that has reached finality
   • CWhen it is validated by a single node
   • DWhen it is included in any block, even if that block is later orphaned
   Reveal Solution Discussion Select an answer first
5. 44foundation · easy

   What is the correct sequence of steps in the Ethereum transaction lifecycle?

   • AValidation, creation, signing, propagation, finality, inclusion in a block
   • BSigning, creation, validation, propagation, finality, inclusion in a block
   • CCreation, signing, propagation, validation, inclusion in a block, finality
   • DPropagation, creation, signing, inclusion in a block, validation, finality
   Reveal Solution Discussion Select an answer first
6. 45foundation · easy

   What information is typically found in a transaction receipt on Ethereum?

   • AThe status of the transaction (success or failure), gas used, logs, and the contract address (if created)
   • BThe full source code of the smart contract
   • CThe private key of the sender
   • DThe list of all future transactions from the same sender
   Reveal Solution Discussion Select an answer first