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In the EVM every account has a persistent key-value store mapping 256-bit words to 256-bit words called ________

A.

Gas

B.

Space

C.

Storage

D.

Datastore

E.

Database

Public blockchains can alter the blockchain ledger by:

A.

Creating a hard fork of the blockchain data, tooling and/or software

B.

Achieving community consensus via a Smart Contract to update the ledger

C.

Re-hashing the blocks from the total block height down to the genesis block

D.

Blockchain ledgers are immutable and can never be altered

You would like to start your Gethin Fast Sync Mode.

What is the command for this?

A.

geth-mode—fast—cache 4096

B.

geth—fast—cache 4096

C.

geth—cache—fast 4096

D.

geth—fast-mode—cache 4096

Which of the following would NOT be true about what a smart contract gives your organization?

A.

Accuracy

B.

Savings

C.

Autonomy

D.

Trust

E.

Legal Assurance

______________is supposed to be the constant cost of network resources/utilization in the Ethereum blockchain?

What is the constant?

A.

Wei

B.

Tether

C.

Gas

D.

Ether

The difference between a decentralized and a distributed system is?

A.

A decentralized system is hosted across multiple datacenters

B.

Distributed and decentralized are the same thing

C.

A decentralized system is not wholly owned by a single entity

D.

A distributed system is not wholly owned by a single entity

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

A.

Blockchains are unique in that they utilize no data structures

B.

Lexicographic Search Tree

C.

Bloom Filter

D.

Merkle Tree

How does a client app communicate with Hyperledger fabric chaincode (Smart Contracts)?

A.

The app uses an SDK which invokes functionality on the chaincode which then announces the transaction to any peers required to endorse the transaction

B.

The app uses Hyperledger Composer to communicate with CouchDB which in turn invokes chaincode functionality

C.

Client apps don’t communicate with Hyperledger fabric directly, they must use Hyperledger Composer for the transmission

D.

The app points to a node’s IP address, then calls an invoke function on the chaincode address to start the write process

The gas price is a value set by the creator of the blockchain transaction? (Select best answer.)

A.

FALSE

B.

Its Negotiable

C.

TRUE

What is a logic gate in electronics and computer science?

A.

A logic gate usually takes in 2 inputs and gives out 1 output. The inputs and outputs are binary values, meaning they can be both 1 and 0.

B.

A logic gate usually takes in 3 inputs and gives out 2 output. The inputs and outputs are binary values, meaning they can be 1 or 0.

C.

A logic gate usually takes in 2 inputs and gives out 6 output. The inputs and outputs are binary values, meaning they can be both 1 and 0.

D.

A logic gate usually takes in 2 inputs and gives out 1 output. The inputs and outputs are binary values, meaning they can be 1 or 0.