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BTA Certified Blockchain Solution Architect Practice Test

CBSA exam Format | Course Contents | Course Outline | exam Syllabus | exam Objectives

This exam is a 70 question multiple-choice exam that lasts 1.5 hours (90 minutes) and is performance-based evaluation of Solution Architect skills and knowledge. Performance-based testing means that candidates must answer questions to reflect what they must perform on the job. Internet access is not provided during the exam- nor is any course material or study guides.

Scores and Reporting
Official scores for exams come immediately following the exam from Pearson VUE. A passing score is 70%. exam results are reported PASS/FAIL and you will be provided your percentage. Blockchain Training Alliance does not report scores on individual items- nor will it provide additional information upon request.

The Certified Blockchain Solution Architect (CBSA) exam is an elite way to demonstrate your knowledge and skills in this emerging space. Additionally- you will become a member of a community of Blockchain leaders. With certification comes monthly industry updates via email and video.

The CBSA exam is a 70 question multiple-choice exam that lasts 1.5 hours and is a performance-based evaluation of Solution Architect skills and knowledge. Internet access is not provided during the exam- nor is any course material or study guides.

A person who holds this certification demonstrates their ability to:
- Architect blockchain solutions
- Work effectively with blockchain engineers and technical leaders
- Choose appropriate blockchain systems for various use cases
- Work effectively with both public and permissioned blockchain systems

This exam will prove that a student completely understands:
- The difference between proof of work- proof of stake- and other proof systems and why they exist
- Why cryptocurrency is needed on certain types of blockchains
- The difference between public- private- and permissioned blockchains
- How blocks are written to the blockchain
- Where cryptography fits into blockchain and the most commonly used systems
- Common use cases for public blockchains
- Common use cases for private & permissioned blockchains
- What is needed to launch your own blockchain
- Common problems & considerations in working with public blockchains
- Awareness of the tech behind common blockchains
- When is mining needed and when it is not
- Byzantine Fault Tolerance
- Consensus among blockchains
- What is hashing
- How addresses- public keys- and private keys work
- What is a smart contract
- Security in blockchain
- Brief history of blockchain
- The programming languages of the most common blockchains
- Common testing and deployment practices for blockchains and blockchain-based apps

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BlockChain
CBSA
BTA Certified Blockchain Solution Architect
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Question: 187
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.
Answer: 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. A XOR logic gate takes in 2 binary inputs and gives out a high output ONLY when the inputs
are different. Meaning, if A and B are inputted to a XOR gate then the out C will be 1 ONLY when A is not equal
toB. Reference: https://blockgeeks.com/guides/cryptocurrencies-cryptography/
Question: 188
Ethereum is considered to be a ______________type of blockchain.
A. Permissionless
B. Permission Based
C. Hybrid
D. Private
Answer: A
Permissionless � anyone can join Anyone can run a node, run mining software/hardware, access a wallet and write
data onto and transact within the blockchain
(as long as they follow the rules of the bitcoin blockchain). There is no way to censor anyone, ever, on the
permissionless bitcoin blockchain.
Reference: https://medium.com/@dustindreifuerst/permissioned-vs-permissionless-blockchains-acb8661ee095
Question: 189
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
Answer: A
Corda does not share the same requirements as Bitcoin: we require absolute certainty over transaction finality and
we need to know who our counterparts are.
So we had the freedom � and took this opportunity � to solve the consensus problem in a different way. In
particular, Corda solves the privacy issue in a number of manners, primarily by allowing for separation of
consensus into a service which we call the Notary Cluster. Corda was designed for business from the start. It has
no cryptocurrency built into the platform and does not require mining-style consensus, which imposes great cost
with little business benefit.
Question: 190
Your customer is an enterprise that is focused on financial sectors. What type of blockchain would this customer
likely want specified for their enterprise?
A. Permissionless
B. Decentralized
C. Hybrid
D. Permissioned
Answer: D
Sometimes referred to as "private" blockchains, you are required to have some sort of permission to access any or
parts of that blockchain. There are a multitude of variants and hybrid permissioned/permissionless blockchains that
exist.
Reference: https://medium.com/@dustindreifuerst/permissioned-vs-permissionless-blockchains-acb8661ee095
Question: 191
Which is the following is the metaphor that describes a logical dilemma that plagues many computer networks?
A. Neo Generals� problem
B. Byzantine Generals� problem
C. Byzantine Admirals� problem
D. Renaissance Generals� problem
Answer: B
BFT is so-named because it represents a solution to the "Byzantine generals� problem," a logical dilemma that
researchers Leslie Lamport, Robert Shostak and Marshall Pease described in an academic paper published in
1982
Reference: https://www.nasdaq.com/article/byzantine-fault-tolerance-the-key-for-blockchains-cm810058
Question: 192
The key difference between encryption and hashing is that encrypted strings can be reversed back into their
original decrypted form if you have the right key?
A. TRUE
B. FALSE
Answer: A
Reference: https://www.securityinnovationeurope.com/blog/page/whats-the-difference-between-hashing-and-
encrypting
Question: 193
A ____________cipher basically means it is using a fixed key which replaces the message with a pseudorandom
string of characters. It is basically the encryption of each letter one at a time.
What is the cipher type?
A. Stream
B. Block
C. Parallel
D. RSA
Answer: A
Stream cipher basically means using a fixed key which replaces the message with a pseudorandom string of
characters. It is basically the encryption of each letter one at a time.
Reference: https://blockgeeks.com/guides/cryptocurrencies-cryptography/
Question: 194
You currently using the Metamask Chrome plugin and you see a selection for Etherescan in the plugin.
What is Etherscan used for?
A. A search engine that allows users to easily lookup, confirm and validate transaction that have taken place
on the Ethereum Blockchain
B. A search engine that allows users to easily lookup, confirm and validate transaction that have taken place
on the Bitcoin Blockchain
C. A search engine that allows users to easily lookup, confirm and validate transaction that have taken place
on the Ethereum and Tokens Blockchain
D. A search engine that allows users to easily lookup, confirm and validate transaction that have taken place
on any Blockchain
Answer: A
A search engine that allows users to easily lookup, confirm and validate transactions that have taken place on the
Ethereum Blockchain
Reference: https://etherscancom.freshdesk.com/support/solutions/articles/35000022140-what-is-etherscan-
Question: 195
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
Answer: CD
Reference: http://www.hl.co.uk/news/2018/2/16/a-brief-history-of-blockchain-technology-everyone-should-read
Question: 196
How many satoshis are in 1 bitcoin and how many wei in an Ether? (Select two.)
A. 1,000,000,000,000,000,000
B. 1,000,000,000,000,000
C. 1,000,000,000
D. 10,000
E. 1,000,000,000,000
Answer: AB
Reference: http://www.btcsatoshi.com/ http://ethdocs.org/en/latest/ether.html
Question: 197
In the Proof of Stake(POS) algorithm the miners are really known as ___________?
A. Notary
B. Oracle
C. Forgers
D. Minters
Answer: C
Proof of Stake has the same goal as proof of work""to validate transactions and achieve consensus in the
chain""and it uses an algorithm but with a different process. With proof of stake, the creator of a new block "is
chosen in a deterministic way, depending on its wealth, also defined as a stake." Since in a proof of stake system,
there is no block reward, but the miners, known as forgers, get the transaction fees. Proponents of this shift,
including Ethereum cofounder
Buterin, like proof of stake for the energy and cost savings realized to get to a distributed form of consensus.
Reference: http://www.hl.co.uk/news/2018/2/16/a-brief-history-of-blockchain-technology-everyone-should-read
Question: 198
A Byzantine failure is the loss of a system service due to a Byzantine fault in systems that requires________.
What is required?
A. Consensus
B. Crypthography
C. Bandwidth
D. Availability
Answer: A
A Byzantine failure is the loss of a system service due to a Byzantine fault in systems that require consensus.
Reference: https://en.wikipedia.org/wiki/
Byzantine_fault_tolerance
Question: 199
SHA-1 is the most commonly used SHA algorithm, and produces a ______-byte hash value(size).
A. 256
B. 128
C. 32
D. 20
Answer: D
SHA-1 is the most commonly used SHA algorithm, and produces a 20-byte hash value.
Reference: https://www.securityinnovationeurope.com/blog/page/whats-the-difference-between-hashing-and-
encrypting
Question: 200
What type of attack would be considered a very large flaw in public blockchains such as Bitcoin�s Blockchain
where the majority of hashpower could possibly be controlled thru an attack?
What is the specific attack Bitcoin could be exposed to?
A. 51% Attacks
B. Tether Token Hack
C. DDoS Attack
D. BIP attack
E. Parity Wallet Attack
Answer: A
Reference: https://blockgeeks.com/guides/hypothetical-attacks-on-cryptocurrencies/
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