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EC-COUNCIL EC-Council Blockchain Fintech CertificationB|FC exam Sample Questions (Q39-Q44):

NEW QUESTION # 39
A________represents a transfer of value from one address to another, Transaction in a blockchain network can be defined also as a record of an event or the ''transfer of value from one account to another''

A. transaction
B. Signature
C. Hash function
D. Block

Answer: A

Explanation:
In blockchain terminology, atransactionrepresents the transfer of value from one address to another. Each transaction is recorded on the blockchain as an immutable entry, often representing a movement of digital assets or a record of an event.
Key Details:
* Nature of Transactions: A blockchain transaction involves a digital asset or token being sent from one blockchain address (wallet) to another. The transaction is broadcast to the network, validated by nodes, and then recorded on the blockchain ledger.
* Transfer of Value: Blockchain transactions serve as proof of the transfer of value, which could represent cryptocurrency movement, digital asset exchange, or a specific record of an event, depending on the blockchain's purpose.
* Inclusion in Blocks: Each transaction is grouped into blocks, which are then cryptographically linked together, forming the blockchain. This ensures all transactions are secure, traceable, and verifiable.
Thus,D. Transactionis the correct answer, as it describes the fundamental concept of transferring value on a blockchain.

NEW QUESTION # 40
These wallets use a this passphrase to derive the private key

A. Brain Wallets
B. Deterministic Wallets
C. Non-Deterministic Wallets
D. Hierarchical Deterministic Wallets

Answer: A

Explanation:
Brain Walletsderive private keys from a passphrase. This approach allows users to create a wallet by memorizing a unique phrase, which is then hashed to generate the corresponding private key.
Key Details:
* Use of Passphrases: Brain wallets use a passphrase that is entered by the user, typically a string of words that can be remembered easily. This passphrase is then converted into a private key using a cryptographic hash function.
* Security Concerns: While convenient, brain wallets are susceptible to brute-force attacks if the passphrase is not sufficiently complex. Simple or common phrases may be vulnerable to attackers who use lists of common phrases to derive potential private keys.
* Distinction from Deterministic Wallets: Unlike Hierarchical Deterministic Wallets, which use a seed phrase to generate a tree of keys, brain wallets derive a single private key directly from a passphrase.
In conclusion,B. Brain Walletsis the correct answer, as these wallets use a passphrase to generate the private key.

NEW QUESTION # 41
______is a computer program that runs stop a blockchain and embedded within it are governance and business logic rules

A. DaS
B. DAO
C. DAC
D. Dapps

Answer: D

Explanation:
Decentralized Applications (Dapps)are applications that run on a blockchain network and include embedded governance and business logic rules. Unlike traditional applications, Dapps are decentralized, meaning they operate on a peer-to-peer network rather than a centralized server, leveraging smart contracts to automatically enforce rules and protocols without intermediaries.
Key Details:
* Characteristics of Dapps: Dapps are open-source, operate autonomously, and store data on a blockchain. They utilize smart contracts to handle various functions, from transaction processing to enforcing governance rules and executing business logic.
* Smart Contracts: The embedded rules within Dapps are typically coded as smart contracts, which are self-executing contracts with the terms of the agreement directly written into lines of code. This ensures that all transactions and operations within the Dapp are transparent, immutable, and automatically enforced.
* Use Cases: Dapps are commonly found in areas such as decentralized finance (DeFi), gaming, supply chain management, and social media, offering users more control and transparency compared to traditional applications.
In conclusion,Dapps (A)is the correct answer as it refers to computer programs running on a blockchain with embedded governance and business logic rules.

NEW QUESTION # 42
A____does not result in a new chain and does not require client nodes to upgrade.

A. Dependent chain
B. Soft fork
C. Side chain
D. Hard fork

Answer: B

Explanation:
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.

NEW QUESTION # 43
Proof of work algorithms are best described as being used for what?

A. Bitcoin mining
B. Proving the user has invested enough in the system
C. Executing transactions
D. Proof that adequate computational resources have been sent.

Answer: D

Explanation:
Proof of Work (PoW)algorithms are primarily used to demonstrate that sufficient computational resources have been expended by a participant to validate transactions and add them to the blockchain. In PoW, miners compete to solve a cryptographic puzzle, which requires significant computational power. This effort helps secure the network by making it prohibitively expensive for any individual or group to alter the blockchain's history.
Key Details:
* Mechanism of PoW: The essence of PoW is to prove that a certain amount of computational work has been performed. This "work" is measured by the effort miners invest in solving the cryptographic puzzle. The process requires miners to find a nonce that, when hashed with the block's data, results in a hash that meets the network's difficulty requirements.
* Security and Integrity: By proving computational work, PoW ensures that miners cannot simply fabricate or alter transactions without a significant investment of resources. This mechanism deters attacks and makes blockchain networks resistant to tampering and double-spending.
* Association with Bitcoin Mining: Although PoW is often associated with Bitcoin mining (as miners expend computational resources to validate and record transactions), its broader purpose is to establish a cost for participation in the network, ensuring that all entries to the blockchain are trustworthy and secure.
Therefore, PoW is best described as a mechanism for proving that adequate computational resources have been expended, aligning with the correct answer B.

NEW QUESTION # 44
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EC-COUNCIL EC-Council Blockchain Fintech CertificationB|FC exam Sample Questions (Q39-Q44):

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