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Blockchain Developer - Hyperledger Fabric
CBDH
BTA Certified Blockchain Developer – Hyperledger Questions and Answers

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Questions # 1:

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

Options:

SDK

SOAP PI

Golang

RPC API

Node.js

Answer

Explanation

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

Questions # 2:

When the________, ______________ or ________function of a chaincode is called, the fabric passes the stub *shim.ChaincodeStub parameter. (Select three.)

Options:

Query

List

Invoke

Init

Write

Delete

Answer

A, C, D

Explanation

When the Init, Invoke or Query function of a chaincode is called, the fabric passes the stub *shim.ChaincodeStub parameter. This stub can be used to call APIs to access to the ledger services, transaction context, or to invoke other chaincodes.

References:

Questions # 3:

When deploying a database option there are some important things to consider from a deployment perspective. CouchDB and LevelDB can be deployed with Fabric.

Which of the following is a true statement in regards to ledger deployment?

Options:

A CouchDB database is closely co-located with a network node and runs in a separate operating system process

A LevelDB database is closely co-located with a network node and runs in a separate operating system process

A CouchDB database is closely co-located with a network node and it is embedded within the same operating system process

A LevelDB database is closely co-located with a network node and it is embedded within the same operating system process

Answer

Explanation

A CouchDB database is closely co-located with a network node and it is embedded within the same operating system process.

References:

Questions # 4:

What means "Forking" the Hyperledger Fabric Github repository? (Select two.)

Options:

Fork will fork the entire repository including all the branches.

Forking is not allowed in Github.

Moving this repository to your GitHub account and removing contents from previous repository.

Fork will fork the specific repository without all the branches.

Creating a copy of this repository under your GitHub account.

Answer

A, E

Explanation

Forking" the repository means creating a copy of this repository under your GitHub account. Note that the fork will fork the entire repository including all the branches.

Questions # 5:

Which Hyperledger Tool brings on demand as-a-service deployment model into the blockchain ecosystem in order to reduce the effort required to create, manage, and terminate blockchains?

Options:

Composer

Cello

Caliper

Quilt

Explorer

Answer

Explanation

Hyperledger Cello is a blockchain provision and operation system, which helps manage blockchain networks in an efficient way. Cello is a tool that could be used for example by vendors and VARs to provide a BaaS to their customer base.

Questions # 6:

When the distributed ledger has been updated and all nodes maintain their own identical copy of the ledger, what were the nodes reached?

Options:

Perfection

Consensus

Replication

Agreement

Answer

Explanation

Consensus is when the distributed ledger has been updated and all nodes maintain their own identical copy of the ledger. This is also known as the “World State” in some blockchains. This architecture allows for a new capacity as a system of recordkeeping that goes beyond being a simple database.

Questions # 7:

Exhibit.

Question # 7

What does the code snippet displayed do?

Options:

It is called on deploy to initialize the ledger

It is called per deletion of the chamcode

It is called on redploy or upgrade to build the blockchain

It is called per transaction on the chaincode

Answer

Questions # 8:

What component of Hyperledger Composer captures the core data in a business network including the business model, transaction logic, and access controls?

Options:

Business Network Adapter

Business Network Interface

Business Network Card

Business Network Archive

Business Network API

Answer

Explanation

Business Network Archive: Capturing 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. Stored as “.bna” files.

Questions # 9:

In Hyperledger Fabric, miners are called?