Blockchain Security Training Network and Node Security 3

Question 1

A BGP hijack reroutes a mining pool's traffic through an attacker. What category does this fall under?

Accepted Answer

Network-layer routing attack

Answer

BGP hijacking manipulates internet routing to intercept or partition blockchain traffic at the network layer.

Question 2

What is the benefit of encrypting peer-to-peer connections between nodes?

Accepted Answer

Prevents eavesdropping and traffic tampering

Answer

Encrypted transport stops passive snooping and active modification of messages exchanged between nodes.

Question 3

Which configuration reduces the risk of a node being partitioned from the honest network?

Accepted Answer

Maintaining diverse, manually added trusted peers

Answer

Diverse and trusted peer connections make it harder for an attacker to isolate or eclipse the node.

Question 4

A node's logs show a flood of malformed packets degrading performance. What attack is most likely?

Accepted Answer

Denial-of-service (DoS) attack

Answer

A flood of malformed or excessive traffic aimed at exhausting resources is a denial-of-service attack.

Question 5

Why should validator nodes use separate sentry nodes in some networks?

Accepted Answer

To shield the validator's IP from direct DoS targeting

Answer

Sentry node architecture hides the validator behind proxy nodes, protecting it from direct denial-of-service attacks.

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