Blockchain Network & Node Security 1 — Questions and Answers
Question 1: Why is node authentication important in blockchain networks?
- It accelerates transaction speed
- It allows anonymous access
- It protects against unauthorized nodes (Correct answer)
- It supports cross-chain interoperability
Correct answer: It protects against unauthorized nodes
Node authentication ensures that only legitimate participants can join and interact with the blockchain, reducing the risk of malicious attacks.
Question 2: Which type of attack targets the availability of blockchain networks by overwhelming them?
- Sybil attack
- Replay attack
- DDoS attack (Correct answer)
- Phishing
Correct answer: DDoS attack
A Distributed Denial of Service (DDoS) attack floods the network with excessive traffic, disrupting normal operations and blocking access.
Question 3: What is the function of transport layer encryption in blockchain communication?
- Reduces mining complexity
- Optimizes smart contract speed
- Protects data transmission (Correct answer)
- Hashes the entire blockchain
Correct answer: Protects data transmission
Transport layer encryption secures data in transit between nodes, protecting it from interception and tampering.
Question 4: Which technique helps detect malicious activity within blockchain nodes?
- Load balancing
- Intrusion Detection System (IDS) (Correct answer)
- Protocol compression
- DNS spoofing
Correct answer: Intrusion Detection System (IDS)
Intrusion Detection Systems (IDS) monitor traffic and behavior patterns to alert administrators of potential attacks or anomalies.
Question 5: How can blockchain nodes be hardened against physical and network attacks?
- Enabling all default services
- Keeping ports open for access
- Disabling encryption
- Implementing hardening techniques (Correct answer)
Correct answer: Implementing hardening techniques
Securing node configurations, using firewalls, and disabling unused ports can significantly reduce attack surfaces.
Question 6: What is the main risk of running a full node on an unsecured network?
- Higher transaction fees
- Slower confirmation times
- Exposure to cyber attacks (Correct answer)
- Limited mining potential
Correct answer: Exposure to cyber attacks
Unsecured nodes are vulnerable to data breaches, tampering, or being used as vectors for broader attacks on the blockchain.
Blockchain Network & Node Security 1
Why is node authentication important in blockchain networks?