What is Enterprise Blockchain
Blockchain
which is used for Enterprises known as Enterprise Blockchain. Hyperledger is one of the examples where we use fabric, Sawtooth etc to develop enterprise specific applications.
Enterprise
blockchain are also known as permissioned blockchain as participants are known to each other and blockchain is not open to everyone.
Enterprise
Blockchain is different from Public Blockchain in many aspects as this is mainly designed fro Enterprises.
Difference
between Enterprise and Public Blockchain or why we need Enterprise Blockchain
Features
of Enterprise Blockchain
Blockchain
is Immutable
Cost
saving by eliminating middleman
High
availability
High
Transparency
Automation
of manual processes
Increase
trust
Examples
of Enterprise Blockchain
Hyperledger
Fabric
Corda
Qurom
What
is Hyperledger?
Hyperledger
was initiated by Linux foundation as a base project to create blockchain based applications.
Hyperledger
is one of most popular software for enterprise blockchain
What
is Hyperledger Umbrella Project?
What
is Hyperledger Fabric?
Hyperledger
Fabric is a software that helps developers to develop enterprise blockchain solutions.
Features
of Hyperledger Fabric
·
It features a plug-and-play
consensus.
·
Support different programming
languages for chaincode development
·
Faster transaction rate.
·
It offers a flexible approach
to data privacy – it performs data isolation via ‘channels,’ data sharing on a need-to-know basis by leveraging private data ‘collections.’
·
Offer different SDK’s
What
is channel in Hyperledger Fabric?
Channel
is one of very important feature of Hyperledger fabric that helps participants to have secrets transactions without letting the whole network know.
This
feature is not available in Public blockchain as each transaction is seen by anyone but in Fabric you can restrict who can see & do what.
Can
we have multiple channel in Fabric Network?
Yes,
there can be n number of channels in a network, but overuse of channel is also not recommended.
What
is MSP (Membership service Provider)?
1.
Contains list of parties/actors involved in Blockchain network
2.
Provide identity to each participant
What
is Fabric CA?
It
is a certificate authority component which can integrate existing registry like LDAP
MSP
leverages fabric CA component
What
is ACL (Access Control List)?
By
using Access Control List (ACL)
1.
Handle permission for parties involved
2.
Handle permission at channel level also
What
is Committing Node?
No,
not all nodes keep copy of ledger, only few nodes keep that and that nodes are known as Committing nodes.
What
is Endorsing Node?
No,
not all nodes execute chaincode , only few nodes do that and that nodes are known as endorsing nodes
What
is Ordering service?
Sequence
of transactions is very important in Blockchain and that is maintained by Ordering node.
What
is State Database?
List
down the high level steps involved in Hyperledger fabric Transaction
Step
1: Client start the transaction
Step
2: Validation of client and transaction
Step
3: Endorsing peer simulate the transaction and send response back to client
Step
4: Verification of responses
Step
5: Broadcast the transaction to Ordering service
Step
6: Order the transaction and put to block
Step
7: Block validation by peers
Step
8: Add block to ledger
What
is the default consensus algorithm used in Fabric?
It
use PBFT where we look for 2/3rd
Majority to proceed further.
In
which scenario the transaction not added to Block?
·
When consensus is not reached
·
Transaction is invalid
Can any client connect
to network and send the transaction?
No,
only authorized clients can send the transactions. In the validation step, client identity is checked if that does not match then transaction is nor processed fur
List
down the prerequisites steps for Hyperledger Fabric setup
Operating
System: Ubuntu Linux 14.04/16.04 (64 bit)
git
& curl: latest version
go
version: 1.13.x
Gradle
Nodejs:
8.9 and higher with the exception of 9
libtool:
latest version
Docker
Engine: 17.06.2 or higher
Docker
Compose: 1.14 or higher
Python:
2.7.x
Why
you need Docker engine for Hyperledger fabric?
Hyperledger
fabric uses different docker containers, like ordering service has its own docker container, chaincode has its own etc.
Why
you need to install go language?
Go
language is used to develop the smart contracts (chaincode) in Hyperledger Fabric.
Why
you need Gradle?
Gradle
is build automation tool needed when you use Java as programming language for chaincode development.
Blockchain Tutorials
is combination of two words, Block
and chain so blockchain is chain of blocks and each block store transaction.Each block in blockchain store more than transaction and that transaction count vary for public and private blockchain.
blockchain interview questions
have a different level of difficulty attached to it. To ensure that you can go through them without any issue, we will group similar questions.