CBSE Blockchain System Testing 2

Question 1

Which testing technique is most effective for discovering re-entrancy vulnerabilities in smart contracts?

Accepted Answer

Fuzz testing with recursive call injection

Answer

Fuzz testing with recursive call injection generates unexpected re-entrant call sequences that static analysis may miss.

Question 2

A blockchain tester wants to verify that a node correctly enforces the longest-chain rule during a network partition. Which test environment best supports this?

Accepted Answer

Simulated network with configurable partition controls

Answer

A simulated network with configurable partition controls lets testers isolate node clusters and observe fork-resolution behavior.

Question 3

During penetration testing of a blockchain node's RPC interface, which attack vector should be tested first?

Accepted Answer

Unauthenticated JSON-RPC method exposure

Answer

Unauthenticated JSON-RPC exposure is the most common and immediately exploitable misconfiguration on blockchain nodes.

Question 4

What does a negative gas limit test in Ethereum smart contract testing verify?

Accepted Answer

That the EVM rejects transactions with an invalid or zero gas limit

Answer

Testing with zero or invalid gas limits verifies that the EVM correctly rejects malformed transactions before execution.

Question 5

In a blockchain security audit, which property is verified by 'liveness testing'?

Accepted Answer

That the network eventually processes valid transactions

Answer

Liveness testing confirms that the blockchain system continues to make progress and process valid transactions under normal and adverse conditions.

(CBSE) Certified Blockchain Security Expert Practice Test

(CBSE) Certified Blockchain Security Expert Practice Test

CBSE Blockchain System Testing 2