1. What is the primary function of a cryptographic hash in a blockchain?

b) To uniquely identify a block

What is the main purpose of the Domain Name System (DNS)?

b) To translate domain names into IP addresses

Which of the following is a challenge of implementing blockchain-based DNS?

c) Limited browser support for blockchain domains

What is the role of a TLD Name Server in DNS resolution?

b) It directs queries to the correct authoritative name server

10. Which of the following best describes a digital certificate?

c)electronic document that binds public key to an individual, organization

6. What is the primary purpose of Ethereum’s native cryptocurrency, Ether (ETH)?

a) To pay for transaction fees and run decentralized applications

What does a PTR (Pointer) record in DNS do?

c) Resolves domain to IP in reverse lookup

5. What is the main advantage of blockchain’s decentralization?

c) No single entity has control over the data

How does a DNS resolver use DNSSEC to ensure the authenticity of DNS responses?

b) By verifying a cryptographic signature with a public key

What security feature does DNSSEC provide to protect DNS data?

c) Cryptographic signatures to verify authenticity

12. Which of the following is a method used to check the validity of certificates in a PKI system?

b) Certificate Revocation List (CRL)

What is a major benefit of using a blockchain-based DNS (BDNS)?

b) Resistance to DNS spoofing and cache poisoning

8. What is the Ethereum Virtual Machine (EVM)?

b) A runtime environment for executing smart contracts

11. What is the primary function of a Registration Authority (RA) in a PKI system?

b) To verify user identities before requesting certificate issuance

4. Which of the following best describes a smart contract?

b) A self-executing contract where the terms are written into code

9. In Public Key Infrastructure (PKI), what is the purpose of a Certificate Authority (CA)?

b) To verify and issue digital certificates

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Block Chain Concepts

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Questions 24

Answers

1
Which blockchain-based DNS system uses the Ethereum blockchain?
b) Ethereum Name Service (ENS)
a) Namecoin
c) DNSSEC
d) Blockchain DNS Protocol
2
1. What is the primary function of a cryptographic hash in a blockchain?
c) To encrypt the transaction data
b) To uniquely identify a block
d) To ensure that only authorized users can access the blockchain
a) To store transaction data
3
What is the main purpose of the Domain Name System (DNS)?
b) To translate domain names into IP addresses
c) To manage website content
a) To encrypt web traffic
d) To provide a secure connection for websites
4
Which of the following is a challenge of implementing blockchain-based DNS?
d) Centralized authority over domain registrations
c) Limited browser support for blockchain domains
a) Fast DNS query resolution
b) Low transaction fees on blockchain networks
5
Which DNS server directs queries to the correct Top-Level Domain (TLD) server?
c) Authoritative Name Server
a) Recursive Resolver
d) TLD Name Server
b) Root Name Server
6
2. Which of the following is NOT a key element of a blockchain?
d) Database servers
a) Blocks
b) Chain
c) Timestamp
7
What is the role of a TLD Name Server in DNS resolution?
d) It caches DNS query results for future use
c) It translates domain names to IP addresses
b) It directs queries to the correct authoritative name server
a) It stores the root domain information
8
10. Which of the following best describes a digital certificate?
c)electronic document that binds public key to an individual, organization
b) A digital signature that guarantees transaction legitimacy
d) A certificate used to sign software code
a) A cryptographic key used for encryption
9
What type of DNS query involves asking multiple servers for information and following their referrals?
b) Direct Query
c) Reverse Query
a) Recursive Query
d)Iterative Query
10
6. What is the primary purpose of Ethereum’s native cryptocurrency, Ether (ETH)?
d) To generate new blocks in the blockchain
b) To serve as a backup for Bitcoin
c) To ensure anonymity of users
a) To pay for transaction fees and run decentralized applications
11
What does a PTR (Pointer) record in DNS do?
a) Maps a domain to an IPv4 address
d) Specifies mail servers for a domain
b) Maps a domain to an IPv6 address
c) Resolves domain to IP in reverse lookup
12
5. What is the main advantage of blockchain’s decentralization?
b) It increases transaction speed
c) No single entity has control over the data
d) It reduces the cost of data storage
a) It reduces the number of users
13
How does a DNS resolver use DNSSEC to ensure the authenticity of DNS responses?
b) By verifying a cryptographic signature with a public key
c) By requesting DNS information from multiple servers
a) By checking the IP address of the DNS server
d) By using a central authority to validate the data
14
What security feature does DNSSEC provide to protect DNS data?
a) Caching DNS records
d) Encrypting web traffic
c) Cryptographic signatures to verify authenticity
b) Preventing recursive queries
15
Which of the following is NOT a type of DNS record?
a) TXT Record
b) CNAME Record
d) MX Record
c) HTTP Record
16
12. Which of the following is a method used to check the validity of certificates in a PKI system?
b) Certificate Revocation List (CRL)
c) Transaction Hash Verification (THV)
d) Public Key Availability (PKA)
a) Key Pair Verification (KPV)
17
3. Which consensus mechanism does Bitcoin use?
d) Delegated Proof of Stake (DPoS)
c) Proof of Authority (PoA)
b) Proof of Work (PoW)
a) Proof of Stake (PoS)
18
What is a major benefit of using a blockchain-based DNS (BDNS)?
b) Resistance to DNS spoofing and cache poisoning
a) Centralized control of domain names
c) Increased DNS query speed
d) Decreased transaction costs
19
8. What is the Ethereum Virtual Machine (EVM)?
a) A cloud service that stores Ethereum data
c) A physical machine used to mine Ethereum
d) A tool for writing decentralized applications
b) A runtime environment for executing smart contracts
20
Which of the following DNS records maps a domain name to an IPv4 address?
b) A Record
d) MX Record
c) CNAME Record
a) AAAA Record
21
7. Which of the following is an example of a decentralized application (dApp)?
b) Amazon Web Services
c) Uniswap
a) Microsoft Office Suite
d) Google Chrome
22
11. What is the primary function of a Registration Authority (RA) in a PKI system?
b) To verify user identities before requesting certificate issuance
a) To issue digital certificates to users
c) To revoke expired certificates
d) To store and manage private keys
23
4. Which of the following best describes a smart contract?
d) A document to track financial transactions
a) A contract stored on paper and signed digitally
b) A self-executing contract where the terms are written into code
c) A contract written for traditional legal enforcement
24
9. In Public Key Infrastructure (PKI), what is the purpose of a Certificate Authority (CA)?
b) To verify and issue digital certificates
a) To encrypt all data transmitted over the internet
c) To store all public and private keys
d) To perform the encryption and decryption operations

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