Blockchain Network & Node Security

Question 1

Why is node authentication important in blockchain networks?

Accepted Answer

It protects against unauthorized nodes

Answer

It accelerates transaction speed

Answer

It allows anonymous access

Answer

It supports cross-chain interoperability

Question 2

Which type of attack targets the availability of blockchain networks by overwhelming them?

Accepted Answer

DDoS attack

Answer

Sybil attack

Answer

Replay attack

Answer

Phishing

Question 3

What is the function of transport layer encryption in blockchain communication?

Accepted Answer

Protects data transmission

Answer

Reduces mining complexity

Answer

Optimizes smart contract speed

Answer

Hashes the entire blockchain

Question 4

Which technique helps detect malicious activity within blockchain nodes?

Accepted Answer

Intrusion Detection System (IDS)

Answer

Load balancing

Answer

Protocol compression

Answer

DNS spoofing

Question 5

How can blockchain nodes be hardened against physical and network attacks?

Accepted Answer

Implementing hardening techniques

Answer

Enabling all default services

Answer

Keeping ports open for access

Answer

Disabling encryption

Question 6

What is the main risk of running a full node on an unsecured network?

Accepted Answer

Exposure to cyber attacks

Answer

Higher transaction fees

Answer

Slower confirmation times

Answer

Limited mining potential