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

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Questions # 11:

A member can participate in multiple Hyperledger blockchain networks by way of_______

Options:

Channels

Peers

DLT

World State

Answer

Questions # 12:

When reviewing chaincode you see a function called "ChaincodeStubInterface" in the program.

What does this function do?

Options:

It is used to access the ledger.

It is used to access the chaincode interface.

It is used to access the ledger and modify the ledger.

It is used to stop the chaincode interface.

Answer

Explanation

References:

Questions # 13:

The Hyperledger Project consists of the following EXCEPT?

Options:

Infrastructure

Tools

Framework

Management

Answer

Explanation

Management is not correct. The Hyperledger Project consists of the following Infrastructure - Ecosystems that accelerate open development and commercial adoption Frameworks – A portfolio of differentiated approaches to business blockchain frameworks developed by a growing community of communities Tools - Typically built for one framework, and through common license and community of communities approach, ported to other frameworks hyperledger.org.

Questions # 14:

In Hyperledger Fabric. Public Key Infrastructure is used to generate cryptographic certificates which are not tied to:

Options:

organizations

network components and infrastructure

end users

Jbrowser

components

Answer

Questions # 15:

________________ endorsement allows the default chaincode-level endorsement policies to be overridden by a different policy for the specified keys.

What type of endorsement is this?

Options:

Policy Driven

Key-Value

Stateless

State based

Answer

Explanation

State Based y default, endorsement policies are specified for a channel’s chaincode at instantiation or upgrade time (that is, one endorsement policy covers all of the state associated with a chaincode). However, there are cases where it may be necessary for a particular state (a particular key-value pair, in other words) to have a different endorsement policy. This state-based endorsement allows the default chaincode-level endorsement policies to be overridden by a different policy for the specified keys.

References:

Questions # 16:

Hyperledger is a membership based distributed ledger platform. What determine the level of permissions required to transact for members?

Options:

Authentication Services

Validator Services

Identity Management

Audit Services

Answer

Explanation

Hyperledger is a private validator network protocol. All the entities in a network must register with membership services to obtain an identity with access and transaction authority on the network. Validators determine the level of permissions required to transact. The network setup also defines the network as permissive, allowing the ease of access. It supports for rapid and high adoption for a more controlled and restrictive environment.

Questions # 17:

Relationship is created using the symbol:

Options:

-->

Answer

Questions # 18:

Consensus on the Blockchain defines________________

Options:

The distribution of each data block

Agreement of a valid transaction by all the network nodes

Security between two blocks of data

Basic security of the blockchain

Answer

Explanation

Consensus is when the distributed ledger has been updated and all nodes maintain their own identical copy of the ledger which essentially is an agreement. 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 # 19:

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

By what the function is implemented?

Options:

Chaincode

Service Account

SDK

API

Answer

Explanation

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

References:

Questions # 20:

The ledger system in Hyperledger Fabric uses what database by default?

Options:

CouchDB

LevelDB

MySQL

MS SQL

PostGres SQL

Answer

Explanation

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

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