Deploying to L2 networks in Blockchain / Solidity - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an L2 network in blockchain?

An L2 (Layer 2) network is a secondary framework built on top of a main blockchain (Layer 1) to improve scalability and reduce transaction costs by processing transactions off the main chain.

beginner

Why deploy smart contracts on L2 networks?

Deploying on L2 reduces gas fees, increases transaction speed, and helps scale applications without congesting the main blockchain.

intermediate

Name two popular L2 solutions.

Optimistic Rollups and zk-Rollups are two popular L2 solutions that bundle transactions off-chain and submit proofs to the main chain.

intermediate

What is a key step before deploying a contract to an L2 network?

You must configure your deployment tools (like Hardhat or Truffle) to connect to the L2 network's RPC endpoint and set the correct chain ID.

intermediate

How does bridging assets relate to deploying on L2?

Bridging moves assets from the main chain to the L2 network so users can interact with contracts there using those assets.

What is the main benefit of deploying smart contracts on L2 networks?

A More complex contract code

B Increased block size on Layer 1

C Lower transaction fees and faster processing

D Eliminates need for Layer 1 blockchain

L2 networks reduce fees and speed up transactions by handling them off the main chain.

Which of the following is an example of an L2 scaling solution?

A zk-Rollups

B Proof of Work

C Sharding

D Mining

zk-Rollups bundle transactions off-chain and submit proofs to Layer 1, making them an L2 solution.

Before deploying to an L2 network, you should:

A Use the same settings as Layer 1

B Configure your deployment tool with the L2 network's RPC and chain ID

C Disable all Layer 1 nodes

D Only write contracts in a new language

Deployment tools need to connect to the correct L2 network endpoint and chain ID.

What does bridging do in the context of L2 networks?

A Transfers assets from Layer 1 to Layer 2

B Creates new tokens on Layer 1

C Deletes contracts on Layer 2

D Increases gas fees

Bridging moves assets so they can be used on the L2 network.

Which statement about L2 networks is true?

A They increase transaction fees

B They replace Layer 1 blockchains completely

C They slow down transaction speed

D They help scale blockchain by processing transactions off the main chain

L2 networks improve scalability by handling transactions off Layer 1.

Explain the process and benefits of deploying smart contracts to an L2 network.

Think about how L2 helps with blockchain scaling and what you need to change in deployment.

Describe how bridging assets works and why it is important for interacting with L2 networks.

Consider how users get their tokens onto the L2 network.