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Blockchain Solution Architect
CBSA
BTA Certified Blockchain Solution Architect Questions and Answers

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Questions # 1:

The___________________ is the runtime environment for smart contracts in Ethereum?

Options:

Metamask

Ether

Mist

EVM

Answer

Explanation

EVM The Ethereum Virtual Machine (EVM) is the runtime environment for smart contracts in Ethereum. It is not only sandboxed, but actually completely isolated, which means that code running inside the EVM has no access to network, filesystem, or other processes. Smart contracts even have limited access to other smart contracts.

Questions # 2:

Public blockchains can alter the blockchain ledger by:

Options:

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

Achieving community consensus via a Smart Contract to update the ledger

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

Blockchain ledgers are immutable and can never be altered

Answer

Questions # 3:

A product’s supply chain data is stored on blockchain. Only members of the product supply chain can write announcements to the blockchain but any consumer can query this data in a store to learn more about the product they want to buy. This is an example of a ____/____ blockchain.

Options:

public /closed

private / open

private / closed

public / open

Answer

Questions # 4:

SHA-1 is the most commonly used SHA algorithm, and produces a ______-byte hash value(size).

Options:

256

128

Answer

Explanation

SHA-1 is the most commonly used SHA algorithm, and produces a 20-byte hash value.

Questions # 5:

______ is the official Ethereum IDE that allows developers to build and deploy contracts and decentralized applications on top of the Ethereum blockchain.

Options:

Mist

Mix

Truffle

Metamask

Embark

Answer

Explanation

Mix is the official Ethereum IDE that allows developers to build and deploy contracts and decentralized applications on top of the Ethereum blockchain

Questions # 6:

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

Options:

Gas

Space

Storage

Datastore

Database

Answer

Explanation

Every account has a persistent key-value store mapping 256-bit words to 256-bit words called storage.

Questions # 7:

When you are developing with Fabric Composer which of the following is true?

Options:

Decreases the time of development

Simplifies the development of applications

Simplifies the integration of client applications

Increases the time of development

Answer

Explanation

Hyperledger Composer is an open-source application development framework which simplifies the creation of Hyperledger Fabric blockchain applications, thus reducing the time and complexity of development. The tool aims at helping users to create blockchain applications based on Hyperledger Fabric without needing to know the low-level (Go Programming) details involved in blockchain networks.

Questions # 8:

You have flown to NYC to have a discussion with a technical executive of a too big to fail bank. You are having a discussion about blockchain algos and the customer is asking what are some disadvantages of using a POW algo?