A developer is using Truffle to test a contract that has a failing test. They want to trace the exact transaction that caused the failure and inspect the contract's storage at that point. Which Truffle feature should they use?

Run 'truffle migrate --reset' to redeploy and then check the logs.

Run 'truffle test --verbose' to see more output.

Use 'truffle console' to manually replay the test.

Run 'truffle test' and then use 'truffle debug ' on the failing transaction.

A developer wants to use Hardhat's local network to test a contract that interacts with an existing contract on the Ethereum mainnet. They need to simulate the mainnet state locally. Which Hardhat feature should they use?

Hardhat Network's forking feature, configured in hardhat.config.js

Hardhat's default network, which automatically includes mainnet state

Hardhat's plugin ecosystem to install a mainnet simulator

Hardhat's console.log to simulate mainnet state

A developer is debugging a smart contract in Remix that reverts only when called by a specific account. They want to inspect the exact state and variables at the moment of failure. Which Remix feature should they use?

The Debugger panel with transaction-level stepping and state inspection.

The Deploy & Run panel's 'At Address' feature to load the contract.

The Solidity static analysis plugin to identify potential vulnerabilities.

The Remix plugin manager to install the Hardhat plugin.

Why would a developer connect an IDE to a test network like Goerli or Sepolia instead of the mainnet?

To get faster compilation times

To test contracts in a realistic environment without spending real funds

To access private data from the mainnet

A team uses Truffle for a project that must deploy to a public testnet. They have written migrations and tests. Which command sequence should they run to deploy and verify the deployment?

truffle migrate --reset --network ropsten, then truffle compile

truffle develop, then truffle migrate --network ropsten

truffle test, then truffle migrate --network ropsten

truffle compile, then truffle migrate --network ropsten

EC-CouncilBlockchain Developer Certification

Domain 6Objective 2

Blockchain IDEs and Plugins BDC Practice Questions (Page 2)

Part of the Development Tools, Web3, and dApps domain, which makes up ~11% of our current practice bank.

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Questions 6–10

6application · medium
A developer is using Truffle to test a contract that has a failing test. They want to trace the exact transaction that caused the failure and inspect the contract's storage at that point. Which Truffle feature should they use?
Select an answer first
7application · medium
A developer wants to use Hardhat's local network to test a contract that interacts with an existing contract on the Ethereum mainnet. They need to simulate the mainnet state locally. Which Hardhat feature should they use?
Select an answer first
8application · medium
A developer is debugging a smart contract in Remix that reverts only when called by a specific account. They want to inspect the exact state and variables at the moment of failure. Which Remix feature should they use?
Select an answer first
9foundation · easy
Why would a developer connect an IDE to a test network like Goerli or Sepolia instead of the mainnet?
Select an answer first
10application · medium
A team uses Truffle for a project that must deploy to a public testnet. They have written migrations and tests. Which command sequence should they run to deploy and verify the deployment?
Select an answer first

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