A dApp displays transaction status to users. A transaction is included in a block, but the block is later orphaned. What should the dApp show to the user?

The transaction is confirmed because it was included in a block.

The transaction is pending because it may be re-included in a future block.

The transaction failed because the block was orphaned.

The transaction is finalized because it was included in a block.

A smart contract has a function that calls an external contract. The external contract's function throws an exception. What happens to the original transaction?

Only the external call is reverted, but the calling contract's state changes remain.

The transaction is included in a block but marked as invalid.

The entire transaction is reverted, including all state changes in the calling contract.

The transaction succeeds, and the external contract's state is partially updated.

Which component of the Ethereum architecture is responsible for executing smart contract bytecode in a sandboxed and deterministic manner?

The consensus layer (e.g., the beacon chain)

The Ethereum Virtual Machine (EVM)

Which of the following is a distinguishing characteristic of an externally owned account (EOA) on Ethereum?

It contains executable code that runs when a transaction is sent to it

It has no balance and cannot send ether

It can only be created by another contract account

It is controlled by a private key and can initiate transactions

EC-CouncilBlockchain Business Leader Certification

Domain 4Objective 1

Ethereum Architecture and Transaction Lifecycle BBLC Practice Questions (Page 5)

Part of the Ethereum, Smart Contracts, and dApps domain, which makes up ~14% of our current practice bank.

45questions here

9free pages

10concepts

Questions 21–25

21foundation · easy
Which field in an Ethereum transaction is used to specify the maximum amount of gas the sender is willing to pay per unit of gas?
Select an answer first
22expert · hard
A dApp displays transaction status to users. A transaction is included in a block, but the block is later orphaned. What should the dApp show to the user?
Select an answer first
23expert · hard
A smart contract has a function that calls an external contract. The external contract's function throws an exception. What happens to the original transaction?
Select an answer first
24foundation · easy
Which component of the Ethereum architecture is responsible for executing smart contract bytecode in a sandboxed and deterministic manner?
Select an answer first
25foundation · easy
Which of the following is a distinguishing characteristic of an externally owned account (EOA) on Ethereum?
Select an answer first

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