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examout.co

It is impossible to persist media types such as MP3 and MOV on any distributed ledger.

A.

FALSE

B.

TRUE

To approve pending ledger transactions, consensus algorithms often implement:

A.

Byzantine Fault Tolerance

B.

Access Control

C.

Kerckhoffs’s Principle

D.

Common Weakness Enumeration

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?

A.

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

B.

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

C.

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

D.

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

Which factor influences the gas cost to deploy a Smart Contact on the Ethereum blockchain?

A.

None. Smart Contract deployment has a fixed gas cost

B.

The types of operations written in code within the Smart Contract

C.

The current Ethereum market conditions

D.

The total size of the complied Smart Contract measured in kilobytes

Which types of data are able to be stored on any given blockchain ledger?

A.

Each blockchain software specifies its own data storage rules

B.

Any data that is within the UTC-8 standard

C.

Unencrypted textual and numerical data

D.

Encrypted textual and numerical data

What is the nonce-field in a transaction?

A.

To sum up all ethers sent from that address

B.

Protects against replay attacks

C.

To distribute the workloads in the EVM

D.

Adds a checksum for transactions

The fabric framework is implemented on ______programming language.

What programming language?

A.

Go

B.

Python

C.

Node.js

D.

Java

E.

JS

You would like to run Ethereum DApps in a browser without a node. (No need to download blockchain.)

What could you use locally in your Chrome browser?

A.

Jaxx

B.

Solidity

C.

Metamask

D.

Mist

In Ethereum the difficulty adjustment algorithm is coded in the ___________ file.

A.

calcDifficultyFrontier

B.

block_validator.go

C.

calcDifficultyHomestead

D.

calcDifficultyvalidator.go

By default, who can see transaction details on a public/open blockchain?

A.

The initiator

B.

Everyone

C.

The recipient of a transaction

D.

The network owner / administrator