CBSE Enterprise Blockchain Security 2

Question 1

Which consensus mechanism is most susceptible to a Sybil attack in an enterprise permissioned blockchain?

Accepted Answer

Proof of Work (PoW)

Answer

Proof of Work is vulnerable to Sybil attacks because an attacker can create many identities and accumulate hashing power without a trusted identity layer.

Question 2

In an enterprise Hyperledger Fabric deployment, what is the primary role of the Membership Service Provider (MSP)?

Accepted Answer

Managing digital identities and access control

Answer

The MSP defines the rules for validating identities and governs which participants are allowed to perform specific actions on the network.

Question 3

A company suspects that a rogue peer is endorsing fraudulent transactions. Which Hyperledger Fabric feature helps detect this?

Accepted Answer

Endorsement policy validation at commit time

Answer

Endorsement policies are re-validated by committing peers, so transactions endorsed by unauthorized nodes are rejected at commit time.

Question 4

What threat does 'transaction malleability' pose in enterprise blockchain environments?

Accepted Answer

Altering a transaction's unique identifier before it is confirmed

Answer

Transaction malleability allows an attacker to change a transaction's hash before confirmation, potentially enabling double-spend or replay attacks.

Question 5

Which approach best mitigates the risk of sensitive data exposure on a public blockchain used for enterprise supply chain?

Accepted Answer

Using zero-knowledge proofs to verify data without revealing it

Answer

Zero-knowledge proofs allow enterprises to prove the validity of a claim without exposing the underlying data on the public ledger.

(CBSE) Certified Blockchain Security Expert Practice Test

(CBSE) Certified Blockchain Security Expert Practice Test

CBSE Enterprise Blockchain Security 2