Ethereum's Purpose, Ecosystem, and Evolution BDC Practice Questions (Page 6)

Questions 26–30

1. 26foundation · easy

   Which Ethereum upgrade marked the transition from proof-of-work to proof-of-stake?

   • AMetropolis
   • BSerenity
   • CHomestead
   • DThe Merge
   Reveal Solution Discussion Select an answer first
2. 27application · medium

   A developer needs to deploy a smart contract to the Ethereum mainnet and wants to interact with it from a backend service. They require a reliable connection to the network without running their own node. Which ecosystem component should they use?

   • AA node provider like Infura or Alchemy
   • BA smart contract development framework like Truffle
   • CA local wallet like MetaMask
   • DA block explorer like Etherscan
   Reveal Solution Discussion Select an answer first
4. 28application · medium

   A developer is setting up a local development environment to test a smart contract before deploying to Ethereum. The developer needs a tool that simulates the Ethereum network, provides accounts with test Ether, and allows quick iteration without real transaction costs. Which tool is most appropriate?

   • AMetaMask, a browser extension wallet
   • BGanache, a personal blockchain for Ethereum development
   • CGeth, the Go Ethereum client
   • DRemix IDE, an online compiler
   Reveal Solution Discussion Select an answer first
5. 29expert · hard

   A consortium of banks wants to use blockchain for interbank settlements. They require privacy for transaction details and high throughput, but they also want to use Ethereum's smart contract capabilities. Which approach best meets their needs?

   • AUse a private network with a single node.
   • BUse a traditional database with smart contract-like logic.
   • CUse the public Ethereum mainnet with encrypted transaction data.
   • DUse a permissioned Ethereum-based network like Hyperledger Besu with private transactions.
   Reveal Solution Discussion Select an answer first
6. 30application · medium

   A developer is writing documentation for a DApp and wants to explain why Ethereum is considered a 'world computer.' Which statement best captures this concept?

   • AEthereum is a programming language that runs on any computer.
   • BEthereum is a centralized cloud service that offers computing resources to users worldwide.
   • CEthereum is a network of physical computers that are owned and operated by a single organization.
   • DEthereum provides a globally accessible, decentralized virtual machine that executes code exactly as programmed without downtime or censorship.
   Reveal Solution Discussion Select an answer first