Architecture and Platforms Flashcards
7 cards from real Blockchain Technology practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Architecture and Platforms flashcards as text
What does the term 'gas' refer to in Ethereum's architecture?
Answer: A unit measuring the computational effort required to execute operations
Gas measures the computational work needed to execute a specific operation on the Ethereum Virtual Machine (EVM), preventing infinite loops and spam.
In Hyperledger Fabric, what is the role of the 'orderer' node?
Answer: To establish consensus by ordering transactions into blocks
The orderer service in Hyperledger Fabric is responsible for collecting transactions, ordering them, and packaging them into blocks for distribution.
What is a 'genesis block'?
Answer: The first block in a blockchain from which all subsequent blocks are chained
The genesis block is block #0 (or #1) — the very first block in a blockchain, hardcoded at network launch and the foundation of the entire chain.
What is the Ethereum Virtual Machine (EVM)?
Answer: A Turing-complete runtime environment that executes smart contract bytecode
The EVM is a sandboxed, stack-based virtual machine embedded in every Ethereum node that executes smart contract code deterministically.
Which of the following best describes a 'light client' in blockchain networks?
Answer: A node that downloads only block headers rather than full block data
A light client downloads block headers and uses Merkle proofs to verify specific transactions without storing the entire blockchain, reducing hardware requirements.
What is the Polkadot relay chain?
Answer: The central chain that provides shared security and interoperability for connected parachains
Polkadot's relay chain is the core blockchain that coordinates consensus, finality, and communication between all the independent parachains in the ecosystem.
What does 'on-chain governance' mean in a blockchain protocol?
Answer: A system where protocol changes are proposed and voted on directly via blockchain transactions
On-chain governance allows token holders to submit and vote on protocol upgrade proposals directly on the blockchain, with results automatically enforced by the code.