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Simulador Blockchain 2
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Questions in this quiz (25)
1A device is connected to a blockchain network running its software and keeping it healthy by transferring information across the network.
Which device is this?- AA DApp
- BA hash
- CA node
- DA token
2What is digital fiat currency?
- AA digital representation of the country’s fiat currency
- BA new form of cryptocurrency based on cloud technology
- CA token used by central banks to charge fees to customers
- DAn online version of a non-fungible smart contract
3What is a known vulnerability of a blockchain network?
- AA concentrated network, which may result in a 51% attack.
- BBlockchain has no vulnerabilities at all and is 100% secure.
- CData spoofing across miner nodes could result in data loss.
- DUnauthorized access can expose data on a public node.
4To enable a virtual machine to read your smart contract, the contract must be compiled.
Into what must the smart contract be compiled?- ABitcode
- BBytecode
- COpcode
- DSmartcode
5In which use case will blockchain be most important?
- AWhen a government sector organization wants to expand outside the country to explore new business opportunities.
- BWhen a growing organization is planning to expand its market share by business acquisitions of competitors.
- CWhen a logistic company wants to manage operations by tracking goods and their ownership in the supply chain.
- DWhen a small organization wants to manage internal operations, departments and teams at headquarters.
6What makes a decentralized autonomous organization (DAO) special?
- AA DAO is a DApp that allows members of the organization to share open-source code privately with each other.
- BA DAO is a form of sharing tokens that allows members of the organization to convert the tokens to any currency.
- CA DAO is a sophisticated smart contract that allows members of the organization to vote on important issues.
- DA DAO is an autonomous contract that allows members of the organization to earn more cryptocurrency.
7Which problem with e-mail or the internet may the application of blockchain technology solve?
- AHTTPS technology is so integrated into the backend of internet that users forget it.
- BLarge e-mail providers are storing the user’s data but can be hacked.
- CNo problem, because blockchain technology is not suitable for e-mail use cases.
8What is a blockchain?
- AA cryptocurrency that uses a centralized system
- BA hashing and encryption algorithm
- CA system for financial transactions
- DAn encrypted system of record keeping
9Blockchain secures the transfer of cryptocurrency using asymmetric cryptography.
How does asymmetric cryptography work for these transfers?- AThe sender encodes the transfer of cryptocurrency using the sender’s private key.
- BThe sender and the recipient exchange their private keys before initiating the transfer.
- CThe sender and the recipient use distributed ledger technology (DLT) to start the transfer.
10What is the impact of blockchain technology on intellectual property rights (IP)?
- ABlockchain and distributed ledger technologies (DLTs) eliminate the need for music labels and distributors.
- BHigh transaction fees and cryptocurrency scams carry a heavy financial burden on music artists.
- CSmart contracts or chain codes must be used without using trusted outside sources to create IP.
- DUnaltered state time-stamped information can easily be connected to record the creation of IP.
11What are decentralized marketplaces used for?
- ABuyers and sellers do transactions for lower prices without central control.
- BBuyers and sellers do transactions independently from the global economy.
- CBuyers and sellers do transactions under governmental control.
- DBuyers and sellers interact in a completely new and safe way.
- EBuyers and sellers interact through a facilitating intermediary.
12What is the purpose of hashes in a blockchain?
- AGenerating a valid mathematical proof, known as the size-resistant property, which must be a number between 0 and 4,294,967,296
- BProducing a string of numbers and letters of variable length, which depends on the number of transactions in each block
- CSealing a block of transactions using a one-way mathematical function to produce a sequence of numbers and letters of fixed length
- DVerifying a specific miner nonce by using a resource-intensive two-way mathematical function for proof of data
13Which description fits only the Proof of Authority (PoA) consensus algorithm?
- AA collaborative consensus algorithm, where approved accounts do the validation and put transactions in blocks.
- BA collaborative consensus algorithm that is facilitated by farmers, who offer leftover memory of their computer to make transactions possible.
- CAn algorithm that involves collaborative validation, performed by validators, which are chosen outside of the consensus.
- DAn algorithm which includes the entire transaction flow, from proposal and endorsement through to ordering, validation and commitment.
14How can blockchain technology best be combined with internet of things (IoT)?
- ABlockchain technology can be used to allow IoT devices to create smart contracts that identify a human’s identity.
- BBlockchain technology can be used to connect all IoT devices together and ensure a stable signal.
- CBlockchain technology can be used to find malicious attackers that wish to steal the IoT devices from a person’s home.
- DBlockchain technology can be used to verify data and the device’s identity to prevent spoofing attacks and data loss.
15What is the working mechanism of DApps?
- ADApps run on a centralized network.
- BDApps run on a client server architecture.
- CDApps run on a peer-to-peer (P2P) network.
- DDApps run on a traditional network.
16Permissioned blockchains always use a consensus algorithm. It decides the mining rights by using a lottery system that randomly selects one node from the pool of validating nodes.
Which consensus algorithm is described here?- ADelegated Proof of Stake (DPoS)
- BProof of Authority (PoA)
- CProof of Burn
- DProof of Capacity (PoC)
- EProof of Elapsed Time (PoET)
- FProof of Space (PoSpace)
- GProof of Stake (PoS)
- HProof of Work (PoW)
17What is the key characteristic of a public blockchain?
- AIt allows anyone in the network to view all transactions.
- BIt allows a user to elect nodes to process transactions.
- CIt allows control over who can participate and at what level.
- DIt allows only trusted parties to operate their blockchain.
18In what way does blockchain technology drive the insurance industry forward?
- AAutomated and authenticated micro-insurance allows overhead costs to be lowered.
- BData duplication and non-transparent transactions are ensured by blockchains.
- CDistributed ledger technology (DLT) prevents automatic settlements and claim handling.
- DNew products such as insurance against natural disasters become possible.
19What is a token?
- AA code-generated instrument to transfer value between two parties over a blockchain network
- BA consensus-generated bearer instrument that represents a valid entry in a distributed database
- CA miner reward mechanism generated to facilitate the maintenance of the shared database
- DA standard generated by cryptocurrencies, with ERC-20 and ERC-721 as the two most popular standards
20What is the purpose of a ledger in blockchain technology?
- AIt acts as a hashing function in any kind of blockchain.
- BIt allows for building security features within blockchain.
- CIt sends cryptocurrency from one party to another party.
- DIt records transactions both chronologically and publicly.
21Which is a function of a node in a blockchain network?
- AControl whether a correct algorithm is used
- BLook for the best node to calculate the nonce
- CRequest software updates regularly
- DRun the blockchain software
22What is a property of smart contracts?
- AThey are always legally binding.
- BThey are part of the first-generation blockchain application
- CThey are enforced with Boolean logic and mathematics.
- DThey can make exceptions in certain cases.
- EThey were first defined by Satoshi Nakamoto
23Why is a public witness used in blockchains?
- ATo create a set of machines that govern special transactions signed by notary authorities called super nodes
- BTo distinguish veto-powered community members to block inaccurate and counterfeit transactions
- CTo spread knowledge, encourage information persistence, and allow each individual node to make an informed choice
- DTo use an automatic protection mechanism against 51% attacks in blockchain networks after mining over half its monetary supply
24What is an advantage of the Proof of Work (PoW) consensus algorithm?
- AIt is a very safe algorithm that avoids data corruption, ensuring that no one can block the transactions from processing.
- BIt is overall a very fast algorithm resulting in greater speed of execution and agility for completion of a transaction.
- CIt is the most cost-efficient algorithm in case of higher numbers of users, ensuring a greater
incentivization for the miners. - DIt is the most rewarding algorithm for miners as the amount of cryptocurrency for miner nodes increases over time.
25Which common attribute of public and private keys guarantee the safety of transactions most?
- AThat the keys cannot be copied
- BThat the messages are encrypted
- CThat they are exclusively complementary
- DThat they are randomly chosen
- EThat they only contain prime numbers
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- Description
- Curso Interno de Empresa EXIN Certifications Quiz on Simulador Blockchain 2, created by Maddox Doza on 24/07/2021.
- Author
- Maddox Doza
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- English
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