Which scenario would it be most appropriate for a blockchain solution to implement a Proof of Work or Proof of Stake consensus?

When the aim of the blockchain is to be a trustless as possible

When the blockchain needs to be permissioned

When the aim of the blockchain is to be a trustless as possible

When the blockchain needs to support millions of transactions

How are blocks of data "chained" together to ensure the integrity of transactions?

The hash of the previous block is written to the header of the current block

The ID of the previous block is stored in the current block

A public key is stored in each block for data decryption

The hash of the genesis block is kept in all block headers

In public key cryptography, the public key is used to:

Sign/approve any transaction/action that might be made by the holder of the key pair

Verify the digital signature of a given key pair

Decrypt the private key so valid transactions/actions can be performed

Which one of the following is true regarding Smart Contracts on the Ethereum blockchain?

They are Turing complete and deterministic in nature

They provide added security over off-chain transaction code on other blockchain networks

Because they are compiled into bytecode they cannot be used in an unintended manner

Any flaw discovered in their code can quickly be updated and redeployed

They are Turing complete and deterministic in nature

Anonymity can be protected in blockchain applications by use of which of the following?

Centralized application hosting

The primary difference between a blockchain and blockless solution is?

Transactions are not verified by the entire network in a blockless environment

Blockless solutions are less reliable

Transactions are not verified by the entire network in a blockless environment

Blockless solutions do not work on mobile devices

In its simplest form, user identity on a blockchain can be unique and secure:

By users utilizing public blockchains

User identity cannot yet be protected on blockchain systems

By users utilizing permissioned blockchains

In common blockchain design, what is one common method to "chain" blocks of data together in order?

Store the hash of the previous block within the current block

Having the genesis node store an ordered, mutable array of block hashes

Writing each block into a separate file on the hard disk of the node

Assigning an order number to each block so they can be sorted when requested

A Blockchain network can be best categorized as:

A decentralized peer-to-peer network

A series of nodes managed by a genesis node

A distributed network centralized ledgers

In regard to blockchain, complete autonomy, transparency, and decentralization:

Are the foundation principles that allow blockchain to operate successfully

Are the aim of all distributed banking and financial institutions

Will never be achievable due to technology limitations

Are highly valuable in some use cases and completely undesirable in other use cases

Are the foundation principles that allow blockchain to operate successfully

Which of these desired outcomes is best obtained through a Blockchain solution?

A website that shows current data from various stock markets

Pending financial transactions need to be stored until completed and then should be deleted

A website that shows current data from various stock markets

A mobile app that displays information about today's weather

Consider the following scenario. A startup is building a chat app for smart phones where the messages sent between users are anonymous and get destroyed within 24 hours of being sent.Which architecture would best solve the product need?

Token management for shareholders in a public blockchain; Mobile apps and data management built on existing multitier systems without use of blockchain

Ethereum for token management and chat messages; Mobile apps use JSON-RPC to communicate directly with Smart Contracts

Private blockchain to persist chat messages; Custom built token system with private blockchain smart contract

Token management for shareholders in a public blockchain; Mobile apps and data management built on existing multitier systems without use of blockchain

Hybrid blockchain for token management with Proof of Stake; private blockchain to persist the chat messages

One consideration that should be taken into account when building a product on a public blockchain is:

How you can transfer your tokens to another blockchain if you decide to switch

Blockchain fees associated with transactions that both the product and the user may have in order to use the product on that blockchain

What countries the blockchain is available in

How you can transfer your tokens to another blockchain if you decide to switch

How often the blockchain goes offline for maintenance

The two main types of transactions you can perform in Hyperledger Fabric are:

Chaincode Read and Chaincode Write transactions

HFRead and HFAppend transactions

Records on a public blockchain are deleted by?

Filing a request with the Ethereum Foundation

Recalling the transaction of Etherscan.io

Deleting the transaction from the app that sent it

In public key cryptography, the private key is used to:

Sign/approve any transaction/action that might be made by the holder of the key pair

Generate unique hash values each time it is used

Verify the digital signature of a public key

Sign/approve any transaction/action that might be made by the holder of the key pair

To determine the anticipated load on an application, the number of end users should be considered along with?

The average number of transactions per user

The average bandwidth speed of the user

To prevent duplicate addresses/accounts from being generated on the same blockchain network, the input of the hash function that generates the address:

Should contain enough entropy or randomness

Proof of Stake consensus is most often needed for and implemented by:

Blockchains that manage wealth and assets

Blockchain networks with low traffic

Blockchains that manage wealth and assets

In common blockchain design, which data structure is used to create a lightweight digital fingerprint of all the transactions within a block?

Blockchains are unique in that they utilize no data structures

What is the accepted best practice for preventing contract addresses from changing when a new contract is released?

Use the "- -addressForce" parameter when releasing a new contract

Move your contract to a new blockchain

Delete the old contract and add the new version in its place

Addresses always change so use a calling contract

Use the "- -addressForce" parameter when releasing a new contract

If a hard fork occurs on a public blockchain software and 20 running nodes choose not to update, what can be said about those 20 nodes?

They are effectually now operating on a different blockchain network than the nodes that updated

They are considered "out of compliance"

They are flagged for removal from the network and can no longer collect fees

They are unable to achieve consensus

Blockchain CBSA Practice Test 6 - Free Online Exam Prep & Questions

Complex application components should try to be concentrated in which application layer?

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Blockchain CBSA Practice Test 6

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