What is a typical deprecation strategy for a smart contract that is no longer needed?

Changing the contract's address to a new one without any user action.

Deleting the contract from the blockchain using a special transaction.

Freezing the contract by disabling key functions and informing users to withdraw funds.

Leaving the contract as is, since it will eventually be overwritten by new transactions.

After deploying a contract to the Ethereum mainnet, a developer wants to allow users to read a public state variable without paying gas. Which interaction method should the developer use?

Call the contract's view function using a read-only RPC call (eth_call)

Deploy a second contract that mirrors the state variable

Use a block explorer's 'Write Contract' tab

Send a transaction to the contract's function from a user's wallet

A developer deployed a smart contract with a critical bug that locks user funds. The contract is not upgradeable. What is the most appropriate lifecycle management action?

Use a selfdestruct function to destroy the contract and recover funds.

Wait for a hard fork to fix the bug.

Modify the contract bytecode directly on-chain.

Deploy a new contract and migrate all state and users to it.

A developer is deploying a contract to the Rinkeby testnet using Truffle. They have configured the network in `truffle-config.js` and have a funded account. What is the next step to deploy the contract?

Run `truffle migrate --network rinkeby`

Run `truffle compile --network rinkeby`

Run `truffle test --network rinkeby`

Run `truffle console --network rinkeby` and manually send a transaction

EC-CouncilBlockchain Developer Certification

Domain 5Objective 6

Contract Lifecycle: Design, Development, and Deployment BDC Practice Questions (Page 5)

Part of the Ethereum and Smart Contract Development domain, which makes up ~11% of our current practice bank.

40questions here

8free pages

7concepts

Questions 21–25

21foundation · easy
What is a typical deprecation strategy for a smart contract that is no longer needed?
Select an answer first
22expert · hard
A developer is writing a contract that must handle a large number of token transfers. They want to minimize gas costs by using a data type that is cheaper for storage. Which Solidity data type should they use for a counter that will not exceed 2^32?
Select an answer first
23application · medium
After deploying a contract to the Ethereum mainnet, a developer wants to allow users to read a public state variable without paying gas. Which interaction method should the developer use?
Select an answer first
24application · medium
A developer deployed a smart contract with a critical bug that locks user funds. The contract is not upgradeable. What is the most appropriate lifecycle management action?
Select an answer first
25application · medium
A developer is deploying a contract to the Rinkeby testnet using Truffle. They have configured the network in `truffle-config.js` and have a funded account. What is the next step to deploy the contract?
Select an answer first

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