Question 1

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

Accepted Answer

The ledger system in Hyperledger fabric uses levelDB. By definition, LevelDB allows concurrent writers to safely insert data into the database by providing internal synchronization. LevelDB uses very coarse-grained synchronization which forces all writes to proceed in an ordered, first-come-first-served basis, effectively reduces throughput to a single thread. State database options include LevelDB and CouchDB. LevelDB is the default key-value state database embedded in the peer process. CouchDB is an optional alternative external state database. Like the LevelDB key-value store, CouchDB can store any binary data that is modeled in chaincode (CouchDB attachment functionality is used internally for non-JSON binary data). But as a JSON document store, CouchDB additionally enables rich query against the chaincode data, when chaincode values (e.g. assets) are modeled as JSON data.

Question 2

Your company is looking to develop a new token and raise funds for this new platform. What is the process your company would like go thru to raise funds?
A) Crowfunding
B) ICO
C) Audit
D) IPO

Accepted Answer

An ICO (Initial Coin Offering) is a process used by companies to raise funds by issuing new tokens or cryptocurrencies to investors, typically in exchange for existing cryptocurrencies like Bitcoin or Ethereum.

Question 3

___________________ensures that the shared ledgers are exact copies, and lowers the risk of fraudulent transactions, because tampering would have to occur across many places at exactly the same time.
A) Encryption
B) Consensus
C) Validation
D) Replication

Accepted Answer

Consensus ensures that the shared ledgers are exact copies, and lowers the risk of fraudulent transactions, because tampering would have to occur across many places at exactly the same time

Question 4

In Hashcash, miners all compete to look for a so called. "____________"which, if provided as input (together with other parts of a block header) to a hash function, yields an output that's numerically small enough to claim the next block reward.
A) Difficulty bits
B) Nonce
C) Merkle Root
D) Timestamp

Accepted Answer

In Hashcash, miners search for a "nonce," which is a number that, when combined with other block header data and hashed, results in a hash value that meets the network's difficulty target.

Question 5

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

Accepted Answer

The answer of You would like to start your Gethin...

Question 6

Looking the graph below, what type of an attack is this likely? 
A) 51% Attack
B) P+ Epsilon Attack
C) Blacklisting
D) Selfish Mining Attack

Accepted Answer

A proof of work system is vulnerable to a particular type of attack called the "P+ epsilon attack". In order to understand how this attack works we must define some terms before hand. Un-Coordinated Choice Model: An uncoordinated choice model is a model where all the participants don't have the incentive to work with one another. The participants may form groups but at no time is the group big enough to become a majority.

Question 7

Geth uses what port to expose the Ethereum RPC Service?
A) 2096
B) 8545
C) 4096
D) 2545

Accepted Answer

Geth, the Go implementation of Ethereum, uses port 8545 by default to expose the Ethereum RPC (Remote Procedure Call) service.

Question 8

In Ethereum the difficulty adjustment algorithm is coded in the ___________ file.
A) calcDifficultyFrontier
B) block_validator.go
C) calcDifficultyHomestead
D) calcDifficultyvalidator.go

Accepted Answer

The difficulty adjustment algorithm in Ethereum is implemented in the `block_validator.go` file, which is part of the Go Ethereum (Geth) client codebase.

Question 9

Ethereum tries to keep the mining time difference between ____ and _____seconds.
A) 10, 18
B) 10, 20
C) 10, 29
D) 10, 19

Accepted Answer

Ethereum aims to maintain the block time between 10 and 19 seconds to ensure a stable and predictable rate of block creation.

Question 10

You currently on a conference call with an executive from a too big to fail bank. They are validating that they want to use Quorum or another enterprise blockchain. They specifically want to know what type of consensus algo it uses and what industry for the Quorum blockchain targets.
A) BFT, cross industry
B) POS, Financial only
C) Majority voting, Financial only
D) Majority voting, cross industry
E) POW, cross industry

Accepted Answer

The answer of You currently on a conference call with...

Question 11

Which of the following is considered the most popular public key encryption algorithm?
A) RSA
B) AES
C) MD5
D) PGP

Accepted Answer

The answer of Which of the following is considered the...

Question 12

Which of the following cryptocurrencies use an alternate consensus method called "Scrypt" to BTC's Proof of Work (POW) SHA-256 algorithm?
A) Ripple
B) Peercoin
C) Litecoin
D) Steemit

Accepted Answer

The Scrypt hash function was initially implemented by the Litecoin development team to avoid what are known, ASICs, from being able mine its cryptocurrency. When mining for cryptocurrencies, users typically have an option between: a CPU, GPU or ASIC miner.

Question 13

The difference between Ethereum tokens and a standalone currency like Litecoin is that ___________tokens piggyback on the Ethereum network, hosted by Ethereum addresses and sent using Ethereum transactions.
A) ERC
B) ERC20
C) Ether
D) BIP

Accepted Answer

The difference between these tokens and a standalone currency like Litecoin is that ERC20 tokens piggyback on the Ethereum network, hosted by Ethereum addresses and sent using Ethereum transactions.

Question 14

You are considering writing a smart contract for Ethereum and would like to use a robust programming language. Which programming language is considered the most flexible and robust for Ethereum?
A) Solidity
B) Python
C) Serpent
D) JS

Accepted Answer

To write smart contracts there are a few different languages: Solidity, which is like JavaScript and has .sol as a file extension, Serpent, Python-like with extension .se, and a 3rd, LLL, based on Lisp. Serpent was popular a while back but Solidity is the most popular right now and more robust, so just use Solidity. You prefer Python? Use Solidity.

Question 15

What are two specific advantages of using Hyperledger Fabric? (Select two.)
A) No order service needed
B) Use any programming language available
C) Open Source Modular architecture
D) Allows components to be plug-and-play
E) Makes mining cryptos more efficient

Accepted Answer

Hyperledger is an open source collaborative effort created for open industrial blockchain development. It started in December 2015 by the Linux Foundation. Linux Foundation's objectives were to create an environment in which communities of software developers and companies meet and coordinate to build blockchain frameworks.

Question 16

In Hyperledger there are three distinct types of nodes. What are the three types of nodes? (Select three.) 1. Client Node: That initiates the transaction 2. Peer Nodes: Commits Transaction & keeps the data in sync across the ledger 3. Ordered: They are the communication backbones and responsible for the distribution of the transactions.
A) Client Node
B) Ordered Node
C) Certificate Node
D) Anchor
E) Peer Node

Accepted Answer

In Hyperledger, all Nodes are NOT equal. There are three distinct types of nodes: 1. Client Node: That initiates the transaction 2. Peer Nodes: Commits Transaction & keeps the data in sync across the ledger 3. Ordered: They are the communication backbones and responsible for the distribution of the transactions

Question 17

Which of the following enterprise blockchain platforms does not have smart contract functionality?
A) Ethereum
B) Quorum
C) R3 Corda
D) Hyperledger Fabric
E) Ripple

Accepted Answer

Ripple is a real-time gross settlement system (RTGS), currency exchange and remittance network by Ripple.

Question 18

When a consensus algo is considered to be "pluggable modularity», what does that mean?
A) Add permission as needed
B) Add user as needed
C) Select an optimal algorithm for your networks
D) Select a specific API that manages the blockchain

Accepted Answer

Pluggable modularity in consensus algorithms means that you can select and integrate the most suitable algorithm for your network's specific needs, allowing for flexibility and optimization.

Question 19

Smart Contracts are generally written in specific programming languages. Which one is NOT a language for smart contracts?
A) .Net
B) Viper
C) LLL
D) Solidity

Accepted Answer

.Net is not a language for smart contracts.

Question 20

How are "assets" in Hyperledger Fabric represented? (Select two.)
A) JSON
B) Node
C) YAML
D) Binary
E) Deployment Manager

Accepted Answer

Assets in Hyperledger Fabric are represented in JSON or Binary. Assets are represented in Hyperledger Fabric as a collection of key-value pairs, with state changes recorded as transactions on a Channel ledger. Assets can be represented in binary and/or JSON form.

Exam 4: BTA Certified Blockchain Solution Architect

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

Your company is looking to develop a new token and raise funds for this new platform. What is the process your company would like go thru to raise funds?

___________________ensures that the shared ledgers are exact copies, and lowers the risk of fraudulent transactions, because tampering would have to occur across many places at exactly the same time.

In Hashcash, miners all compete to look for a so called. "____________"which, if provided as input (together with other parts of a block header) to a hash function, yields an output that's numerically small enough to claim the next block reward.

You would like to start your Gethin Fast Sync Mode. What is the command for this?

Looking the graph below, what type of an attack is this likely?

Geth uses what port to expose the Ethereum RPC Service?

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

Ethereum tries to keep the mining time difference between and _seconds.

You currently on a conference call with an executive from a too big to fail bank. They are validating that they want to use Quorum or another enterprise blockchain. They specifically want to know what type of consensus algo it uses and what industry for the Quorum blockchain targets.

Which of the following is considered the most popular public key encryption algorithm?

Which of the following cryptocurrencies use an alternate consensus method called "Scrypt" to BTC's Proof of Work (POW) SHA-256 algorithm?

The difference between Ethereum tokens and a standalone currency like Litecoin is that ___________tokens piggyback on the Ethereum network, hosted by Ethereum addresses and sent using Ethereum transactions.

You are considering writing a smart contract for Ethereum and would like to use a robust programming language. Which programming language is considered the most flexible and robust for Ethereum?

What are two specific advantages of using Hyperledger Fabric? (Select two.)

Which of the following enterprise blockchain platforms does not have smart contract functionality?

When a consensus algo is considered to be "pluggable modularity», what does that mean?

Smart Contracts are generally written in specific programming languages. Which one is NOT a language for smart contracts?

How are "assets" in Hyperledger Fabric represented? (Select two.)