Test Flashcards
9 cards from real Ethereum Developer practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 9 Test flashcards as text
What is TRUE about Go-Ethereum and Ganache
Answer: Ganache provides an in-memory blockchain simulation, whereas Go-Ethereum provides a genuine blockchain node that allows you to build your own local private network, connect to test networks, and access the main network.
Ganache is a personal blockchain for Ethereum development, providing an in-memory simulation for rapid testing of smart contracts without connecting to a live network. In contrast, Go-Ethereum (Geth) is a full client implementation that connects to actual Ethereum networks, allowing users to interact with the mainnet, testnets, or create persistent private blockchain networks. This distinction highlights their different use cases for developers.
Which eth2 client does Chainsafe support?
Answer: Lodestar
Chainsafe is a prominent blockchain development company that actively contributes to the Ethereum ecosystem. They are the development team behind the Lodestar client, which is an Ethereum 2.0 (Consensus Layer) client implementation. Lodestar is written in TypeScript and is designed to be a lightweight and efficient client for the network.
Which is TRUE about Ethereum Nodes?
Answer: Must implement a JSON-RPC for communication with clients and the Ethereum Protocol.
Ethereum nodes are software applications that adhere to the Ethereum protocol to interact with the blockchain. For external applications like dApps, wallets, or explorers to communicate with these nodes, a standardized interface is essential. This interface is typically a JSON-RPC (Remote Procedure Call) API, which allows clients to send requests and receive data from the node.
4) Which is TRUE about Block Timestamp?
Answer: The timestamp is always independent of the time zone, but it can be slightly modified by a miner.
Block timestamps on Ethereum are recorded in Unix time (UTC), ensuring they are independent of specific time zones. While miners are generally incentivized to keep timestamps accurate, they possess a small degree of flexibility to adjust the timestamp within a limited range (e.g., a few seconds or minutes). This slight manipulability means timestamps are not entirely secure for generating true randomness on the blockchain.
What is a Private Network?
Answer: A network that only operates in a private area, and prohibits public access
A private network in the context of blockchain refers to a blockchain instance where access and participation are restricted and require explicit permission. Unlike public blockchains, which are open to anyone, private networks are controlled environments. They are typically used by enterprises or consortia that need a permissioned blockchain for specific business applications and data privacy.
What exactly are Ethereum Nodes?
Answer: Software applications that use the Ethereum Protocol to communicate with one another and JSON-RPC interfaces to communicate with external systems.
Ethereum nodes are fundamental software applications that form the backbone of the Ethereum network. They communicate with each other using the Ethereum Protocol to validate transactions, store the blockchain's history, and maintain network consensus. Additionally, these nodes expose JSON-RPC interfaces, which enable external systems like wallets, decentralized applications (dApps), and block explorers to interact with the blockchain by querying data and submitting transactions.
Which is TRUE about Block Diffficulty?
Answer: The Block Difficulty rises when there are less than 10 seconds between mined blocks and falls when there are more than 20 seconds between mined blocks.
Ethereum's difficulty adjustment algorithm (prior to the Merge) was designed to maintain a consistent block production rate. If blocks were mined too quickly, specifically less than 10 seconds apart, the difficulty would increase to slow down block creation. Conversely, if blocks were mined too slowly, more than 20 seconds apart, the difficulty would decrease to speed up the process, aiming for an average block time of around 13-15 seconds.
The ETH2 mascot was given the name of :
Answer: Leslie Lamport
The ETH2 mascot, a friendly cartoon character often associated with the Ethereum 2.0 (Consensus Layer) upgrade, was named Leslie Lamport. This name is a direct tribute to the distinguished computer scientist Leslie Lamport, renowned for his foundational contributions to distributed systems, including algorithms like Paxos and Lamport timestamps, which are crucial concepts in blockchain technology.
After a new block has been mined,
Answer: The block includes a list of the transactions and uncles. The balance of the miners is increased by the amount of gas spent during such transactions. Additionally, the miner receives the block reward. The network then achieves consensus by repeating the same transactions on all participating nodes.
After a new block is successfully mined on Ethereum (pre-Merge Proof-of-Work), it contains a list of validated transactions and references to any 'uncle' blocks. The miner who found the block receives a block reward (newly minted ETH) and the transaction fees (gas) from all included transactions. The rest of the network achieves consensus by verifying the block's validity and executing its transactions to update their local state, ensuring all nodes agree on the blockchain's current state.