CBDH Cheat Sheet 2026

The 30 highest-yield CBDH facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. In a Raft ordering service, how do orderer nodes authenticate each other? → Mutual TLS using consenter TLS certificates listed in the channel config
2. What is the purpose of the `signcerts` folder within an MSP directory structure? → To store the entity's own signing certificate used for identity
3. What is the MOST effective way to stay current with developments in security & access control for Certified Blockchain Developer Hyperledger? → Participating in professional development, industry events, and peer collaboration
4. Which Hyperledger project is an Ethereum client written in Java that supports public and permissioned networks? → Hyperledger Besu
5. What does the orderer BatchTimeout setting control? → Maximum time to wait after the first transaction before cutting a block
6. What is the PRIMARY purpose of documentation & best practices in Certified Blockchain Developer Hyperledger? → To provide accurate, accessible information for decision-making and compliance
7. What is the recommended pattern for large files such as PDFs in a blockchain application? → Store the file off-chain and keep its hash and reference on-chain
8. Which state database choice generally gives faster simple key lookups but no rich queries? → LevelDB
9. Endorsers return different read/write sets, causing 'proposal responses do not match'. Which chaincode practice is the typical culprit? → Using non-deterministic logic such as random numbers or the local system time
10. An approval succeeds, but the chaincode never starts because the package ID used does not match the installed package. How do you retrieve the correct ID? → peer lifecycle chaincode queryinstalled
11. For chaincode-as-a-service, which file in the package's code archive tells the peer how to reach the external chaincode server? → connection.json
12. In Certified Blockchain Developer Hyperledger, how should sensitive documentation & best practices be protected? → Through role-based access controls, encryption, and compliance with privacy regulations
13. Which practice supports disaster recovery for a Fabric peer in the cloud? → Regular snapshots or backups of ledger and state database volumes
14. What does the `stub.PutState(key, value)` function do in Fabric chaincode? → Writes or updates a key-value pair on the ledger
15. Which action BEST demonstrates a commitment to compliance & governance in Certified Blockchain Developer Hyperledger? → Maintaining current knowledge of all applicable regulations and standards
16. A peer's gRPC endpoint must be reachable by clients outside the cluster. Which Kubernetes object typically exposes it? → Service of type LoadBalancer or an Ingress
17. Which approach best supports the 'right to be forgotten' with Fabric private data collections? → Use blockToLive to purge private data from peers after a set number of blocks
18. How many orderer node failures can a 5-node Raft cluster tolerate while still making progress? → 2
19. What is the FOUNDATION of effective performance monitoring & optimization in Certified Blockchain Developer Hyperledger? → Clearly defined standards and measurable criteria
20. What is the main purpose of a Kubernetes Secret in a Fabric deployment? → Storing sensitive material such as private keys and TLS credentials
21. What is the primary consensus mechanism used in Hyperledger Fabric? → Execute-Order-Validate (EOV)
22. Which consensus algorithms are available for a private Hyperledger Besu network? → IBFT 2.0, QBFT and Clique
23. What is the MOST effective way to stay current with developments in implementation & configuration for Certified Blockchain Developer Hyperledger? → Participating in professional development, industry events, and peer collaboration
24. A Raft ordering service has 5 orderer nodes. How many nodes can fail while the channel still orders transactions? → 2
25. In Certified Blockchain Developer Hyperledger, how does security & access control contribute to professional credibility? → By demonstrating competence, maintaining standards, and delivering consistent results
26. Which cloud practice best protects an organization's Fabric private signing keys from extraction? → Placing them in an HSM or cloud KMS-backed key store
27. Which approach helps control cloud costs for a development blockchain network? → Scaling down or shutting off non-production environments when idle
28. A peer built from an older release fails to join a channel whose config sets Application capability V2_0. What explains this? → The peer does not support the required capability level, so it must be upgraded
29. What is the role of a Kubernetes NetworkPolicy in a blockchain deployment? → Restricting which pods can communicate with each other
30. How is a client's identity accessed within Hyperledger Fabric chaincode? → Using the ClientIdentity object from the chaincode shim package