What are two challenges with using a Proof of Work algorithm? (Select two.)

A. Mining pools not allowed

B. Difficulty rate goes done every year.

C. Expensive

D. Power Intensive

Your company working for is now considering the blockchain. They would like to perform a POC with R3 Corda. The CIO was reading about different blockchain consensus algos and would like to understand what type of consensus algos is used with Corda.

What is the best answer?

A. R3 Corda is a pluggable blockchain and allows the enterprise flexibility

B. R3 Corda is a byzantine fault tolerant blokchain

C. R3 Corda is a proof of stake based blockchain

D. R3 Corda is a proof of work based blockchain

You are currently consulting with an organization that ships widgets overseas. They would like to implement a Hyperledger Fabric and would like to know about how to use cryptocurrencies with Hyperledger Fabric.

What is the best answer?

A. If they need a native currency for their chain network, they can develop their own native currency with chaincode.

B. Hyperledger Fabric can be integrated with any crypto currency by using the proper APIs.

C. If they need a native currency for their chain network, they must use Ripple currency with chaincode.

D. If they need a native currency for their chain network, they must use Ethereum currency with chaincode.

E. Hyperledger Fabric does not support cryptocurrencies.

With Hyperledger Fabric ledger, it supports both levelDB / CouchDB for state data?

A. FALSE

B. TRUE

What is the difference in using Go-Ethereum over Ganache?

A. Can automate builds with Go Ethereum but you can't with Ganache

B. Go Ethereum is written in Java whereas Ganache is written in Golang

C. Go Ethereum is real blockchain whereas Ganache is a blockchain simulation

D. Ganache is a real blockchain whereas Go Ethereum is a blockchain simulation

By design, permissioned blockchains such as Hyperledger Fabric are not capable of creating or utilizing cryptocurrency.

A. FALSE

B. TRUE

Which technical feature of blockchain best promotes the notion of a blockchain being "censorship resistant"?

A. An immutable ledger of transactions

B. Permissions-based transactions

C. Smart Contracts/transactional code that is executed "on chain"

D. Consensus systems through Proof of Work and Proof of Stake

Taking a series of unrelated transactions and writing them to a particular block is:

A. Highly insecure and considered bad practice

B. Most common in public blockchain

C. Most common in permissioned blockchains

D. Required among all blockchains

In common blockchain design, identity and transaction approval is possible through:

A. AES encryption

B. Public key cryptography

C. Secret key cryptography

D. None of the above

To approve pending ledger transactions, consensus algorithms often implement:

A. Byzantine Fault Tolerance

B. Access Control

C. Kerckhoffs's Principle

D. Common Weakness Enumeration