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Free 312-82 Exam Braindumps (page: 3)

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PDF with 50 Questions

These wallets store keys in a tree structure derived from a seed.

  1. Brain Wallets
  2. Hierarchical Deterministic Wallets
  3. Deterministic Wallets
  4. Non-Deterministic Wallets

Answer(s): B

Explanation:

Hierarchical Deterministic (HD) Wallets are 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.



Which of the following are likely use cases for blockchain in the energy industry? (Select two.)

  1. Safety in energy production
  2. Energy trading
  3. Safety in energy transport
  4. Smart power grids

Answer(s): B,D

Explanation:

Blockchain technology has significant potential in the energy industry, particularly in energy trading and smart power grids. By providing a transparent, decentralized, and secure platform for transactions, blockchain can facilitate peer-to-peer energy trading and improve the efficiency and reliability of smart grids.
Key Details:
Energy Trading: Blockchain enables peer-to-peer energy trading where individuals and companies can buy and sell excess energy (such as solar or wind power) directly to each other. This decentralized model reduces the need for intermediaries and allows consumers to benefit from direct energy sales and purchases.
Smart Power Grids: Blockchain can enhance smart grid systems by enabling real-time data sharing and automated decision-making. With blockchain, smart grids can securely record and share data related to energy production, consumption, and storage, thereby improving grid management, reducing waste, and optimizing energy distribution.
Enhanced Transparency and Security: By recording all transactions in an immutable ledger, blockchain ensures transparency and security, reducing the risks of fraud and discrepancies in the energy market. This is especially beneficial in energy trading where trust and accurate record- keeping are essential.
Thus, Energy trading (B) and Smart power grids (D) are the most likely use cases for blockchain in the energy industry.



_______uses a Trusted Execution environment (TEE) to provide randomness and safety in the leader election process via a guaranteed wait time.

  1. PoET
  2. PoD
  3. PoA
  4. Pol

Answer(s): 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.



A________in a new chain and requires clients to upgrade in order to participate on the new blockchain.

  1. Hard fork
  2. Soft fork
  3. Sharding
  4. Sub chain

Answer(s): A

Explanation:

A hard fork occurs when there is a fundamental change in a blockchain's protocol, resulting in the creation of a new chain that is incompatible with the previous one. After a hard fork, nodes must upgrade to the new version of the blockchain's software to continue participating in the network. A hard fork can be used to implement new features, fix security issues, or change core aspects of the blockchain.
Key Details:
Differences from Soft Forks: Unlike a soft fork, which is backward-compatible and allows nodes on the previous version to still participate, a hard fork splits the blockchain into two distinct paths, with the upgraded path requiring new software.
Examples: Notable hard forks include Bitcoin Cash from Bitcoin and Ethereum Classic from Ethereum. These forks occurred due to disagreements within the community on how to handle certain protocol changes, leading to the creation of separate blockchains. Upgrade Requirements: Participants on the blockchain who wish to continue on the new chain after a hard fork must update their software. Those who do not upgrade remain on the original chain, which continues as a separate, incompatible blockchain. Thus, the correct answer is Hard fork (A), as it directly refers to a blockchain split that requires client upgrades for participation.






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