Question 1

When creating a network according to an organization's structure and also bootstrap a channel what are the following artifacts we would need to generate? 
A) Genesis Block, License File and Anchor Peer Configs for each organization.
B) Genesis Block, ledger Configuration and Anchor Peer Configs for each organization.
C) Genesis Block, Channel Configuration and Anchor Peer Configs for each organization.
D) Genesis Block, Channel Configuration and Anchor MSP Configs for each organization.

Accepted Answer

To create a network according to an organization's structure, and to bootstrap a channel, we will need to generate the following artifacts: A genesis block, containing organization-specific certificates that serve to initialize the Fabric blockchain. Channel configuration information. Anchor peer configurations for each organization. An anchor peer serves as a fulcrum within an organization, for cross-organization ledger syncing using the Fabric gossip protocol.

Question 2

In Hyperledger Fabric, there are three types of peer nodes depending upon the assigned roles.  What are three types? (Choose three.)
A) Committing Peer
B) Endorsing Peer
C) Peer
D) Client peer
E) MSP Peer
F) Channel Peer
G) Ordering Peer

Accepted Answer

So not all peer nodes are same. There are different types of peer nodes with different roles in the network: Endorser peer Anchor peer Orderer peer Endorser peer Peers can be marked as Endorser peer (Endorsing peer). Upon receiving the "transaction invocation request" from the Client application the Endorser peer Validates the transaction. Check certificate details and roles of the requester. Executes the Chaincode (Smart Contract) and simulates the outcome of the transaction. But it does not update the ledger. At the end of the above two tasks the Endorser may approve to disapprove the transaction. As only the Endorser node executes the Chaincode (Smart Contract) so there is no necessity to install Chaincode in each and every node of the network which increases the scalibility of the network. Anchor peer Anchor peer or cluster of Anchor peers is configured at the time of Channel configuration. Just to remind you, in Hyperledger Fabric you can configure secret channels among the peers and transactions among the peers of that channel are visible only to them. Anchor peer receives updates and broadcasts the updates to the other peers in the organization. Anchor peers are discoverable. So any peer marked as Anchor peer can be discovered by the Orderer peer or any other peer. Orderer peer Orderer peer is considered as the central communication channel for the Hyperledger Fabric network. Orderer peer/node is responsible for consistent Ledger state accross the network. Orderer peer creates the block and delivers that to all the peers. Orderer is built on top of a message oriented architecture. There are two options are currently available to implement Orderer peer: Solo: Suitable for development. Single point failure. Solo should not be used for the production ready network. Kafka: Production ready Hyperledger Fabric network uses Kafka as the Orderer implementation. Kafka is a messaging software that has high throughput fault tolerant feature.

Question 3

Chaincode with Hyperledger Fabric can be written in what development languages? Select All that apply.
A) Node.js
B) Go
C) Java

Accepted Answer

Chaincode with Hyperledger Fabric can be written in Node.js, Go, and Java.

Question 4

Blockchain solutions are comprised of four building blocks. Which of the following answers list the building blocks?
A) Shared ledger, Privacy, Trust, and Smart Contracts or (Chaincode)
B) Shared ledger, Centralization, Trustless, and Smart Contracts or (Chaincode)
C) Shared ledger, Privacy, Trustless, and Smart Contracts or (Chaincode)
D) Shared ledger, Centralization, Trust, and Smart Contacts or (Chaincode)

Accepted Answer

The four building blocks of blockchain solutions are Shared ledger, Privacy, Trust, and Smart Contracts (Chaincode). These components work together to ensure transparency, security, and automation in blockchain systems.

Question 5

What component on the blockchain maintains the "world state"?
A) Consensus Algorithm
B) Reputation Manager
C) Consensus Manager
D) Distributed Ledger

Accepted Answer

Distributed Ledger manages the world state and the transaction log in the blockchain. The world state is defined as the state of all transactions on the Blockchain, where all nodes agree that all blocks on the Blockchain are at the same state. It implements three key attributes. It efficiently calculates the cryptographic hash of the entire dataset of each block. It efficiently transmits a minimal "delta" changes to the dataset, when a peer is out of sync and needs to "catch up". It minimizes the amount of stored data required for each peer to operate.

Question 6

Hyperledger Composer has the following two main components.
A) Composer Framework and a Business Network Archive
B) Composer Playground and a Business Network Configuration
C) Composer Playground and a Business Network Archive
D) Distributed Ledger and a Business Network Archive
E) Distributed Ledger and Composer playground

Accepted Answer

There are two parts: 1. Business Network Archive which essentially captures the core data in a business network, including the business model, transaction logic, and access controls, the Business Network Archive packages these elements up and deploys them to a runtime. Business Network Archive files are stored as ".bna" files. AND 2. Composer Playground which is web-based tool allows developers to learn Hyperledger Composer, model out their business network (domain), test that network, and deploy that network to a live instance of a blockchain network. The playground keeps the development model in browser storage, allowing them to be easily uploaded or downloaded.

Question 7

An_____________ is defined as a communication node that is responsible for the distribution of blockchain transactions in Hyperledger Fabric.
A) MSP
B) Peer Node
C) Client Node
D) Endorsing Node
E) Orderer

Accepted Answer

Orderer Ordering services handles the main function of the Hyperledger Fabric to maintain consistency in the transactions processes. Ordering services provides a shared communication to clients and peers and helps in broadcasting the messages containing transactions.

Question 8

Which tool would you select to that would allow users to measure performance of a specific implementation with predefined use cases?
A) Hyperledger Caliper
B) Hyperledger Explorer
C) Hyperledger Cello
D) Hyperledger Quilt

Accepted Answer

Caliper, a blockchain benchmark tool that allows users to measure performance of a specific implementation with predefined use cases, is in incubation status and was contributed by developers from numerous organizations.

Question 9

What is the application that is used by Hyperledger Fabric to communicate with the network?
A) SDK
B) SOAP PI
C) Golang
D) RPC API
E) Node.js

Accepted Answer

Hyperledger Fabric includes the REST and JSON RPC APIs, events, and an SDK for applications to communicate with the network.

Question 10

Which of the following is a role in Fabric that has permission to create transactions and query network data?
A) Chain Transactor
B) Chain Administrator
C) Chain Auditor
D) Chain Member

Accepted Answer

Chain Transactor is a role in Fabric that has permission to create transactions and query network data.

Question 11

The gossip data dissemination protocol performs which three functions? (Choose three.)
A) Manages peer discovery and channel membership
B) Disseminates ledger data across all peers on the channel
C) Manages channel membership only
D) Sync ledger state across all peers on any channel
E) Sync ledger state across all peers on the channel
F) Manages peer discovery only

Accepted Answer

Gossip Protocol The gossip data dissemination protocol performs three functions Manages peer discovery and channel membership Disseminates ledger data across all peers on the channel Syncs ledger state across all peers on the channel.

Question 12

All of the following are key terms in Cryptography EXCEPT?
A) Function
B) Root Hash
C) Secret
D) Code
E) Cipher

Accepted Answer

Cryptography is used in Blockchain to address the issues and concerns of privacy. Cryptography is the study of how to send information back and forth securely in the presence of adversaries. A cryptographic function is a function for encoding or encrypting data to protect the contents from others. The following components are the basis of a cryptographic function: The Secret: The data which we are trying to protect The Key: A piece of data used for encrypting and decrypting the secret The Function: The process or function used to encrypt the secret The Cipher: The encrypted secret data, output of the function The Secret and the Key are passed into the Function to create a Cipher.

Question 13

Chaincode Services uses Docker to host (deploy) the chaincode without relying on any virtual machine or computer language. What would be the main reason or best reason that Hyperledger chose containers over virtual machines?
A) Docker provides a secured, lightweight method to sandbox chaincode execution that is "locked down".
B) Docker provides a secured, lightweight method to sandbox chaincode execution that is "locked down" but additional programming languages cannot be enabled
C) Docker provides a secured, lightweight method to sandbox chaincode execution that is not "locked down"
D) Docker is fully compatible with Hyperledger and Linux with an upgrade subscription.

Accepted Answer

Docker provides a secured, lightweight method to sandbox chaincode execution that is "locked down" Chaincode Services uses Docker to host (deploy) the chaincode without relying on any virtual machine or computer language. Docker provides a secured, lightweight method to sandbox chaincode execution. The environment is a "locked down" and secured container, along with a set of signed base images containing secure OS and chaincode language, runtime and SDK images for Golang Additional programming languages can be enabled

Question 14

What type of peer executes chaincode?
A) Anchor peer
B) Endorsing Peer
C) Chaincode is executed by the client
D) Ordered Peer
E) Chaincode is not executed by a peer.

Accepted Answer

Endorsing Peer can be marked as Endorser peer (i.e. Endorsing peer). Upon receiving the "transaction invocation request" from the Client application the Endorser peer Validates the transaction. Check certificate details and roles of the requester. Executes the Chaincode (Smart Contract) and simulates the outcome of the transaction. But it does not update the ledger. At the end of the above two tasks the Endorser may approve to disapprove the transaction. As only the Endorser node executes the Chaincode (Smart Contract) so there is no necessity to install Chaincode in each and every node of the network which increases the scalability of the network.

Question 15

A transaction in Hyperledger Fabric is a request to the blockchain to execute a function on the ledger. By what the function is implemented?
A) Chaincode
B) Service Account
C) SDK
D) API

Accepted Answer

Chaincode is programmatic logic. A transaction is a request to the blockchain to execute a function on the ledger. The function is implemented by a chaincode. Aka smart contracts

Question 16

What Hyperledger sponsored tool is a new 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?
A) Hyperledger Quilt
B) Hyperledger Composer
C) Hyperledger Explorer
D) Hyperledger Cello

Accepted Answer

There is a new 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.

Question 17

Hyperledger blockchain frameworks reach consensus by performing two separate activities. What are the two activities? (Select two.)
A) Updating Transactions
B) Validating Transactions
C) Ordering Transactions
D) Writing Transactions
E) Packing Transactions

Accepted Answer

Hyperledger business blockchain frameworks reach consensus by performing two separate activities: 1. Ordering of transactions 2. Validating transactions by logically separating these activities, we ensure that any Hyperledger framework can work with any Hyperledger consensus module.

Question 18

The CA (Certificate Authority) in Hyperledger Fabric issues the certificates. These certificates are used for identity validation and for transmission of encrypted data that only the owner (person, organization or software) of a specific certificate is able to decrypt and read. What types of certificates are issued by the CA?
A) tcert
B) ecert
C) rootcert

Accepted Answer

Rootcert, tcert and ecert. As The CA (Fabric CA by default) issues a root certificate (rootCert) to each member (organization or individual) that is authorized to join the network. The CA also issues an enrollment certificate (eCert) to each member component, server-side applications and occasionally end users. Each enrolled user is granted an allocation of transaction certificates (tCerts). Each tCert authorizes one network transaction.

Question 19

What certificate is granted an "allocation" of transaction certificates to each user?  
A) rootcert
B) ecerts
C) tcerts
D) PKI
E) RSA

Accepted Answer

Each enrolled user is granted an allocation of transaction certificates (tCerts). Reference: https://console.bluemix.net/docs/services/blockchain/reference/v10_fabric.html#hyperledger-fabric

Question 20

Blockchain services consists of three major components. What are they? (Select three.)
A) Consensus Manager
B) Distributed Ledger
C) Peer to Peer Protocol
D) Reputation Manager
E) Membership Services

Accepted Answer

1. P2P Protocol is implemented over HTTP/2 standards and uses Google RPC.. P2P components define messages used by peer nodes, from point to point to multicast. 2. Distributed Ledger manages the world state and the transaction log in the blockchain. 3. Consensus Manager defines the interface between the consensus algorithm and the other Hyperledger components.

Exam 3: BTA Certified Blockchain Developer - Hyperledger

When creating a network according to an organization's structure and also bootstrap a channel what are the following artifacts we would need to generate?

In Hyperledger Fabric, there are three types of peer nodes depending upon the assigned roles. What are three types? (Choose three.)

Chaincode with Hyperledger Fabric can be written in what development languages? Select All that apply.

Blockchain solutions are comprised of four building blocks. Which of the following answers list the building blocks?

What component on the blockchain maintains the "world state"?

Hyperledger Composer has the following two main components.

An_____________ is defined as a communication node that is responsible for the distribution of blockchain transactions in Hyperledger Fabric.

Which tool would you select to that would allow users to measure performance of a specific implementation with predefined use cases?

What is the application that is used by Hyperledger Fabric to communicate with the network?

Which of the following is a role in Fabric that has permission to create transactions and query network data?

The gossip data dissemination protocol performs which three functions? (Choose three.)

All of the following are key terms in Cryptography EXCEPT?

Chaincode Services uses Docker to host (deploy) the chaincode without relying on any virtual machine or computer language. What would be the main reason or best reason that Hyperledger chose containers over virtual machines?

What type of peer executes chaincode?

A transaction in Hyperledger Fabric is a request to the blockchain to execute a function on the ledger. By what the function is implemented?

Hyperledger blockchain frameworks reach consensus by performing two separate activities. What are the two activities? (Select two.)

What certificate is granted an "allocation" of transaction certificates to each user?

Blockchain services consists of three major components. What are they? (Select three.)