How does caching improve the performance of a dApp's frontend?

By automatically upgrading the smart contract

By increasing the block size of the blockchain

By storing frequently accessed data locally to reduce repeated blockchain calls

When a dApp's frontend fails to read a value from a smart contract, what is a common first step to diagnose the issue?

Change the contract's state variable visibility

Check that the contract address and ABI used by the frontend match the deployed contract

Reinstall the frontend's dependencies

A developer is deploying a dApp to a public testnet. The deployment script uses a private key stored in an environment variable. The script fails with 'insufficient funds'. The developer has already requested test ETH from a faucet. What is the most likely cause?

The private key is invalid and the script is using a different address.

The faucet sent ETH to a different address than the one derived from the private key.

The testnet's gas price is too high for the deployment transaction.

The deployment script is using the wrong network ID.

Which configuration value must a dApp's frontend know to connect to a deployed smart contract?

The private key of the contract owner

The IP address of the contract's hosting server

The contract's deployment address

What is the typical first step in the end-to-end deployment process of a decentralized application (dApp) to a blockchain network?

Setting up the development environment and toolchain

Deploying the frontend to a hosting service

Funding the deployment account with native tokens

Writing and compiling the smart contract code

EC-CouncilBlockchain Developer Certification

Domain 6Objective 6

Deploy and Manage dApps BDC Practice Questions (Page 4)

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

40questions here

8free pages

10concepts

Questions 16–20

16foundation · easy
How does caching improve the performance of a dApp's frontend?
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17foundation · easy
When a dApp's frontend fails to read a value from a smart contract, what is a common first step to diagnose the issue?
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18expert · hard
A developer is deploying a dApp to a public testnet. The deployment script uses a private key stored in an environment variable. The script fails with 'insufficient funds'. The developer has already requested test ETH from a faucet. What is the most likely cause?
Select an answer first
19foundation · easy
Which configuration value must a dApp's frontend know to connect to a deployed smart contract?
Select an answer first
20foundation · easy
What is the typical first step in the end-to-end deployment process of a decentralized application (dApp) to a blockchain network?
Select an answer first

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