{"id":68830,"date":"2018-12-31T10:45:18","date_gmt":"2018-12-31T10:45:18","guid":{"rendered":"https:\/\/www.whizlabs.com\/blog\/?p=68830"},"modified":"2022-09-07T22:39:27","modified_gmt":"2022-09-08T04:09:27","slug":"blockchain-interview-questions","status":"publish","type":"post","link":"https:\/\/www.whizlabs.com\/blog\/blockchain-interview-questions\/","title":{"rendered":"Top 30 Blockchain Interview Questions & Answers"},"content":{"rendered":"

We have now come to the era of new technology which if implemented successfully will bring a revolution in the field of internet. Investors and other big companies are investing a huge amount of cash in this technology, named Blockchain Technology<\/a>. In the coming future, it could become one of the seamless technology, the web has ever experienced. It is also a disruptive technology that could drastically destroy the structure of present industries.<\/span><\/p>\n

Try Now:\u00a0Certified Blockchain Expert Free Test<\/a><\/p><\/blockquote>\n

Top 30 Blockchain Interview Questions<\/h2>\n

If you are among one of the early birds who has understood the importance of Blockchain and are ready to dive in, this list of top Blockchain interview question and answers has been composed for you only.\u00a0<\/span>These questions are collected with years of experience in the Blockchain field which are asked by interviewers. <\/span><\/p>\n

For the convenience of our fellow readers, we have divided this Blockchain tutorial into three sets of 10 questions each. Where the first set will deal with Blockchain interview questions for freshers with some simple and easy concepts. The second part will deal with Blockchain interview questions for experienced <\/b>and the later section is Blockchain interview questions for developers.<\/span><\/p>\n

Blockchain Interview Questions for Freshers<\/span><\/p>\n

This section consists of the basic blockchain interview questions that you may come across in the interview as a beginner. So, if you are new to the world of blockchain technology or have little experience, this set of blockchain interview questions will help you crack the interview.<\/p>\n

1. What is Blockchain technology? State some of the benefits of Blockchain?<\/span><\/h4>\n

Answer: The blockchain is a decentralized and distributed public ledger which cannot be altered or it is very hard to change once the ledger enters the database system. All the transactions in a Blockchain are secured using algorithms based on cryptography.\u00a0 <\/span>When a record enters in the system first it is validated over the distributed network and then stored in a block. So if you want to alter the records then you have to travel from the last block to the genesis block or block \u201c0\u201d which is very difficult. <\/span><\/p>\n

The main benefits of the blockchain technology are:<\/span><\/p>\n

1. Immutability: <\/b>There are multiple records created and stored of a single block over the peer-to-peer network so it is very difficult to alter something in the block.<\/span><\/p>\n

2. Security: <\/b>The transactions are very secure as it is based on cryptography.<\/span><\/p>\n

3. Transparency & Resiliency: <\/b>As all the transactions are stored over a distributed network so anyone can view it, which makes blockchain transparent and resilient.<\/span><\/p>\n

2. What are the different types of Blockchain available for transactions?<\/span><\/h4>\n

Answer: There are three types of Blockchain as defined below:<\/span><\/p>\n

    \n
  1. Public:<\/strong> This type of Blockchain is available for all and does not need any kind of permission to join and a user can download the required software and start running the node on their own. E.g. Bitcoin, Ethereum, etc.<\/span><\/li>\n
  2. Private:<\/strong> In a private Blockchain where all the permission are kept centralized to an organization and only authorized persons are responsible to add and verify the blocks. E.g. multichain, locks tax, etc.<\/span><\/li>\n
  3. Consortium:<\/strong> This type of Blockchain is a private Blockchain managed by a group of individuals or consortium and only specific predefined nodes are authorized to add and verify the blocks. E.g. Hyperledger.<\/span><\/li>\n<\/ol>\n

    \"type<\/p>\n

    3. Define a Node in a Blockchain.<\/span><\/h4>\n

    Answer: A node is a system or a computer which is essentially connected to a Blockchain network used to process transactions.\u00a0<\/span><\/p>\n

    4. Define Consensus and tell the commonly used consensus models.<\/span><\/h4>\n

    Answer: A consensus is a general agreement which is used to validate the transactions while following a protocol. A consensus is mainly of two types –<\/span><\/p>\n