________is used to split up the tasks into multiple chunks that are then processed by multiple nodes.
Correct Answer: A
Shardingis a scalability technique that splits tasks or data into smaller, more manageable pieces called "shards." These shards are then processed in parallel by multiple nodes in a network. By dividing the workload, sharding can significantly enhance the efficiency and speed of blockchain networks, which is especially beneficial for handling large transaction volumes and complex computations. Key Details: * Purpose of Sharding: The main goal of sharding is to address blockchain scalability issues. By enabling the network to process transactions and data in parallel, it reduces the load on individual nodes, thus increasing the overall throughput of the blockchain. * How Sharding Works: In a sharded blockchain, each node only needs to process a portion of the total data rather than every single transaction on the network. Each shard is responsible for a subset of data and transactions, and only nodes within a particular shard need to validate its transactions. * Relevance in Blockchain: Sharding is crucial in large-scale blockchain networks like Ethereum, where high transaction volumes can lead to congestion. Ethereum 2.0, for example, incorporates sharding as a core feature to improve its scalability and transaction processing capacity. Sharding is, therefore, the correct answer, as it directly refers to the method of dividing tasks for parallel processing in a distributed environment.
Question 7
What is the term for the smallest subunit in Ether.
Correct Answer: D
The smallest subunit of Ether is called aWei. Ether (ETH) is divided into several subunits for precision in transactions, with Wei being the smallest, equivalent to 10#1810^{-18}10#18 Ether. Key Details: * Subunits of Ether: The Ethereum network uses smaller units to facilitate transactions that require a higher degree of accuracy. The most commonly used subunits are Gwei (billion Wei), but Wei represents the smallest possible division. * Importance in Transactions: Wei ensures that Ether can be broken down into very small units, allowing for microtransactions and precise gas calculations, which are essential in smart contract executions. * Naming Convention: This denomination was named in honor of Wei Dai, a cryptographer who proposed b-money, an early concept of digital currency. Therefore,D. Weiis the correct answer, as it is the smallest unit of Ether.
Question 8
When using __________ the chain of ownership is established by a chain of digital signatures as each owner signs when transferring ownership.
Correct Answer: D
The UTXO (Unspent Transaction Output) model establishes a chain of ownership by using digital signatures. In this model, each transaction consists of inputs (from previous UTXOs) and outputs (new UTXOs), and ownership is transferred by the current owner signing the transaction. This digital signature is then verified by the recipient, ensuring a secure and traceable chain of ownership. Key Details: Functionality of UTXO: UTXO is a fundamental part of Bitcoin's transaction model. When a transaction occurs, it consumes previous outputs as inputs, generating new UTXOs. Each UTXO can only be spent once, and ownership is verified through cryptographic signatures. Chain of Ownership: The UTXO model inherently creates a clear and verifiable chain of ownership, as each output is signed by the current owner and used as input for future transactions, maintaining a continuous and transparent record of asset transfers. Security through Digital Signatures: UTXO-based transactions rely on digital signatures to authenticate and authorize asset transfers, ensuring that only the rightful owner can initiate a transaction. Thus, D. UTXO is the correct answer, as it accurately describes the model where ownership is established through a chain of digital signatures.
Question 9
A____does not result in a new chain and does not require client nodes to upgrade.
Correct Answer: B
Asoft forkis a change to a blockchain protocol that is backward-compatible, meaning it does not result in the creation of a new chain and does not require all client nodes to upgrade. Nodes that do not upgrade can still participate in the network, although they may not have access to all new features introduced by the soft fork. Key Details: * Backward Compatibility: In a soft fork, updated nodes enforce the new rules, while non-updated nodes continue to follow the older protocol but remain part of the same blockchain. This contrasts with hard forks, where incompatibility leads to the creation of a new chain. * Use Cases: Soft forks are commonly used to implement protocol upgrades or adjustments that do not fundamentally alter the structure of the blockchain, such as increasing block size limits or adding new features that are optional. * Examples: An example of a soft fork is the Segregated Witness (SegWit) update on the Bitcoin blockchain, which was implemented to increase block capacity without splitting the chain. Thus,B. Soft forkis the correct answer, as it refers to a backward-compatible update that does not require a new chain or mandatory upgrades from all nodes.
Question 10
How many bitcoin are available?
Correct Answer: D
Bitcoin has a fixed supply limit of21 millioncoins, as defined by its protocol. This cap is coded into Bitcoin's original protocol and cannot be altered without a consensus change, ensuring its scarcity and value proposition as a "digital gold." Key Details: * Fixed Supply: Bitcoin's supply limit is integral to its design, as it imposes a hard cap on the total number of coins that can ever be mined. This limited supply is one of the factors that gives Bitcoin its deflationary nature and potential as a store of value. * Mining Schedule: New Bitcoins are released into circulation through mining rewards, which halve approximately every four years (in an event known as the "halving"). This gradually reduces the issuance rate until the maximum supply is reached around the year 2140. * Difference from Other Cryptocurrencies: Unlike some cryptocurrencies that have flexible or inflationary supply models, Bitcoin's finite supply is a distinguishing feature that appeals to those concerned with long-term value preservation. Therefore,D. 21 millionis the correct answer, as it accurately reflects the total number of Bitcoin that will ever exist.
