CCA Blockchain Fundamentals 1 — Questions and Answers
Question 1: What is a blockchain?
- A centralized database
- A type of email system
- A distributed digital ledger (Correct answer)
- A private web browser
Correct answer: A distributed digital ledger
A blockchain is a distributed ledger that records transactions in a secure, transparent, and tamper-evident way.
Question 2: What is the function of a block in blockchain?
- Stores passwords
- Holds transaction records and hashes (Correct answer)
- Deletes outdated data
- Manages user accounts
Correct answer: Holds transaction records and hashes
Each block contains a batch of verified transactions and links to the previous block, forming a chain.
Question 3: What makes blockchain data immutable?
- Biometric scans
- Cloud backup systems
- Consensus and cryptographic hashing (Correct answer)
- Firewall protections
Correct answer: Consensus and cryptographic hashing
Cryptographic hashes and consensus mechanisms ensure that data cannot be changed without detection.
Question 4: What is a public blockchain?
- A government-run database
- A private network of institutions
- A permissionless distributed ledger (Correct answer)
- An offline document system
Correct answer: A permissionless distributed ledger
A public blockchain is open to anyone and is maintained by a decentralized network of nodes.
Question 5: Which of the following best describes consensus mechanisms?
- They assign IP addresses
- They ensure agreement on the ledger state (Correct answer)
- They manage internet bandwidth
- They encrypt personal files
Correct answer: They ensure agreement on the ledger state
Consensus mechanisms like Proof of Work or Proof of Stake validate transactions and secure the blockchain network.
Question 6: Why is decentralization important in blockchain?
- To lower hardware costs
- To enable offline use
- To increase transparency and security (Correct answer)
- To simplify coding
Correct answer: To increase transparency and security
Decentralization reduces reliance on a central authority, enhances security, and promotes transparency.
CCA Blockchain Fundamentals 1
What is a blockchain?