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NEW QUESTION # 22
What two types of transactions are there in Ethereum(pick z):
Answer: B,C
Explanation:
In Ethereum, there are two main types of transactions:Message CallandContract Creation. These transaction types enable Ethereum to support both the execution of contracts and interactions between accounts.
Key Details:
* Message Call Transactions: These transactions involve interactions between externally owned accounts (EOAs) or between EOAs and smart contracts. Message calls are used to transfer Ether or invoke functions within existing smart contracts.
* Contract Creation Transactions: This transaction type is used specifically to deploy new smart contracts on the Ethereum blockchain. During a contract creation transaction, the code for the new contract is included, which the network processes and stores at a unique address.
* Exclusion of User Transactions: While "User" refers to EOAs, it is not a type of transaction itself in Ethereum. Transactions in Ethereum are categorized based on their purpose - either calling an existing contract (Message Call) or creating a new one (Contract Creation).
Thus,C. Message CallandD. Contract Creationare the correct answers, as they represent the two main transaction types in Ethereum.
NEW QUESTION # 23
These wallets store keys in a tree structure derived from a seed.
Answer: B
Explanation:
Hierarchical Deterministic (HD) Walletsare wallets that generate private and public keys in a tree structure, starting from a single seed phrase. This seed phrase can generate multiple key pairs, allowing users to back up and recover all their wallet addresses using one phrase, which enhances security and convenience.
Key Details:
* Tree Structure: HD wallets use a root seed to derive an entire hierarchy of keys. Each branch in the tree can create new sub-branches, generating separate addresses for different transactions without reusing them, which provides better privacy.
* Seed-Based Recovery: Users can restore all wallet addresses with the original seed phrase, making HD wallets more secure and easy to back up compared to non-deterministic wallets, which would require individual backups for each key.
* Compatibility with Blockchain Standards: HD wallets adhere to the BIP32 and BIP44 standards, which outline the derivation paths and formats used by these wallets. This compatibility allows for interoperability among different wallet providers.
In conclusion, Hierarchical Deterministic Wallets (answer B) best describes wallets that store keys in a tree structure derived from a seed.
NEW QUESTION # 24
_______uses a Trusted Execution environment (TEE) to provide randomness and safety in the leader election process via a guaranteed wait time.
Answer: A
Explanation:
Proof of Elapsed Time (PoET)is a consensus mechanism that uses a Trusted Execution Environment (TEE) to ensure randomness and safety in the leader election process by enforcing a guaranteed wait time.
Developed by Intel, PoET is particularly used in permissioned blockchain networks where a TEE can securely run code to determine which node is elected to propose the next block. This mechanism is efficient in terms of energy consumption and provides a fair method for selecting a leader without requiring intensive computational power.
Key Details:
* Role of TEE in PoET: The TEE ensures that nodes wait for a random period before being eligible to propose a new block. This waiting period is verified by the TEE, which acts as a trusted third party to confirm that nodes have adhered to the assigned wait time.
* Randomness and Security: PoET provides randomness in the leader selection process, reducing the chances of any node gaining an unfair advantage. It also promotes security by leveraging the TEE, which is designed to prevent tampering with the waiting time calculations.
* Use Cases: PoET is mainly used in permissioned blockchain environments like Hyperledger Sawtooth, where nodes are pre-approved, and there is a need for a scalable yet secure consensus mechanism.
In summary, PoET is the correct answer as it directly refers to a consensus mechanism that utilizes a Trusted Execution Environment for leader election.
NEW QUESTION # 25
Is a Microsoft blockchain development platform that allows the creation of custom private blockchains.
Answer: B
Explanation:
MicrosoftAzureis a blockchain development platform that enables the creation of custom private blockchains.
Azure Blockchain Service provides tools and services that allow organizations to set up and manage consortium blockchain networks, customize smart contracts, and create tailored blockchain applications.
Azure supports multiple blockchain frameworks, includingEthereumandHyperledger Fabric, making it versatile for both private and public network needs.
Key Details:
* Azure Blockchain Service: This service facilitates the deployment of managed blockchain networks on the cloud, leveraging Azure's infrastructure to deliver scalability, security, and reliability for private and consortium blockchain applications.
* Private Blockchain Capabilities: As a private blockchain service, Azure allows businesses to operate their blockchain in a controlled, permissioned environment. This offers greater control over data and participants, making it ideal for enterprise use cases like supply chain management, finance, and legal contracts.
* Blockchain Framework Compatibility: Although Azure supports a variety of blockchain protocols, it primarily focuses on private blockchain deployments, allowing for detailed control over network participants and data visibility.
In summary, Microsoft Azure stands out as a flexible and comprehensive platform for private blockchain development, catering to enterprises with tailored solutions and extensive cloud-based services.
NEW QUESTION # 26
According to a study be Deloitte, which of the following are benefits of blockchain for the insurance industry (pick two)?
Answer: A,B
Explanation:
According to studies conducted by Deloitte and other industry research, blockchain offers several benefits for the insurance industry, particularly inmore efficient claims processingandlower costs. Blockchain's capabilities in data immutability, transparency, and automation play key roles in streamlining insurance processes and reducing operational expenses.
Key Details:
* Efficient Claims Processing: Blockchain enables quicker verification and processing of claims by automating workflows through smart contracts. This reduces paperwork, minimizes errors, and speeds up the claims process, improving customer satisfaction.
* Lower Costs: By reducing intermediaries and leveraging automation, blockchain lowers administrative costs. It minimizes the need for manual verification and fraud detection, which traditionally consume significant resources in the insurance industry.
* Transparency and Fraud Reduction: Blockchain provides an immutable and transparent record of all transactions. This helps prevent fraud, as all stakeholders have access to the same data, reducing discrepancies and the need for extensive audits.
In conclusion,A. More efficient claims processingandD. Lower costsare the correct answers, as these are key benefits of blockchain for the insurance industry identified in Deloitte's research.
NEW QUESTION # 27
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