Ethereum Developer Ethereum Upgrades and Layer 2 Scaling 2

Question 1

What is EIP-4844 (Proto-Danksharding) and its primary benefit?

Accepted Answer

It introduces blob-carrying transactions that drastically reduce rollup data posting costs

Answer

EIP-4844 introduced a new transaction type carrying data 'blobs' with a separate, cheaper fee market, reducing L2 data costs by up to 10x.

Question 2

What is account abstraction in Ethereum, as proposed by ERC-4337?

Accepted Answer

Allowing smart contracts to act as user accounts with custom validation logic for transactions

Answer

ERC-4337 enables smart contract wallets with programmable transaction validation, enabling gasless transactions, social recovery, and batch operations.

Question 3

What is the purpose of the `CREATE2` opcode in Ethereum?

Accepted Answer

To deploy a contract at a deterministic address based on the deployer, salt, and init code

Answer

`CREATE2` allows predetermining a contract's deployment address before it exists, enabling counterfactual contract instantiation.

Question 4

What is a state channel in Ethereum layer-2 scaling?

Accepted Answer

An off-chain communication channel between parties that only settles the final state on-chain

Answer

State channels allow two or more parties to exchange signed state updates off-chain, opening and closing the channel with on-chain transactions.

Question 5

What does the Ethereum Cancun upgrade (2024) primarily achieve for developers?

Accepted Answer

It activates EIP-4844, adding blob transactions that lower rollup fees significantly

Answer

The Cancun upgrade activated EIP-4844, introducing blob-carrying transactions that dramatically reduced the cost of posting data for L2 rollups.

Ethereum Developer Practice Test

Ethereum Developer Practice Test

Ethereum Developer Ethereum Upgrades and Layer 2 Scaling 2