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 Authority (PoA)

Answer

Delegated Proof of Stake (DPoS)

Answer

Practical Byzantine Fault Tolerance (PBFT)

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

Encrypting chaincode execution

Answer

Distributing ledger data across peers

Answer

Monitoring transaction throughput

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

Gossip protocol

Answer

CouchDB state database

Answer

Kafka ordering service

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

Leaking private keys stored in hardware wallets

Answer

Overwriting smart contract bytecode in the EVM

Answer

Preventing nodes from reaching quorum

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

Storing all data on-chain with AES-256 encryption

Answer

Relying on network obscurity by using a private RPC endpoint

Answer

Compressing data with gzip before submission

Question 6

An enterprise blockchain network experiences a 51% attack scenario in its proof-of-stake system. What is the correct term for the minimum stake an attacker must control?

Accepted Answer

51% of total staked tokens

Answer

33% of total staked tokens

Answer

67% of total staked tokens

Answer

100% of circulating supply

Question 7

Which security layer is most critical to configure when exposing a Hyperledger Fabric peer node to external enterprise applications?

Accepted Answer

Mutual TLS (mTLS) for gRPC communication

Answer

CORS headers on the REST API

Answer

HTTP Basic Authentication on the admin console

Answer

Firewall rules blocking UDP traffic