HFCP Exam Questions Get Updated [2024] with Correct Answers
Practice HFCP Questions With Certification guide Q&A from Training Expert TorrentValid
Linux Foundation HFCP Exam Syllabus Topics:
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NEW QUESTION # 21
What is the main purpose of certificates in Hyperledger Fabric?
- A. Certificates are used solely in Transport Layer Security (TLS) protocols, providing the necessary keys.
- B. Providing identity for different actors, helping with ledger consistency, authorization and Transport Layer Security (TLS).
- C. Encrypting the stored ledger data in a way that certain data is visible only to certain organizations.
- D. Certificates are certified digital documents making certain parts of the system transparent.
Answer: B
Explanation:
In Hyperledger Fabric, certificates primarily provide identity for various actors within the network, such as peers, orderers, and clients. These certificates facilitate not just node-to-node communication and data integrity but also contribute significantly to the security measures of the network, such as authentication and authorization processes. Importantly, these certificates are utilized in TLS (Transport Layer Security) protocols to secure communications between nodeson the network. Fabric utilizes X.509 certificates for these purposes, which are issued by a Certificate Authority (CA) within the network .
NEW QUESTION # 22
When building a test network, how many nodes are adequate for an Ordering Service?
- A. One ordering nodes is sufficient for an Ordering Service.
- B. There is no set number of nodes required for an Ordering Service.
- C. Three ordering nodes are needed for a test Ordering Service.
- D. Ordering Service nodes are optional in a test network.
Answer: A
Explanation:
For a test network in Hyperledger Fabric, one ordering node is sufficient to form an Ordering Service7. The test network typically uses a single-node Raft ordering service for simplicity and educational purposes. However, for production networks, a multi-node ordering service is recommended for fault tolerance and high availability8.
NEW QUESTION # 23
What Fabric Gateway client API call could a client application use to update ledger state?
- A. Update
- B. Submit
- C. Invoke
- D. Evaluate
Answer: B
Explanation:
In the context of the Fabric Gateway client API, the call that a client application would use to update the ledger state is Submit1. The Submit function combines the actions of endorsing a transaction proposal, submitting the transaction to the ordering service, and waiting for the transaction to be committed to the ledger into a single blocking call. This simplifies the process for the client application, allowing it to update the ledger state with a single line of code. The Evaluate call, on the other hand, is used to query the current state of the ledger without making any updates2. There are no Invoke or Update calls in the Fabric Gateway client API as per the official documentation
NEW QUESTION # 24
After the transaction that contains the delState("A") function is committed, what happens to the ledger and state database?
- A. The state of the key "A" is removed from the state database, but its history remains in the ledger.
- B. The deleting transaction sets an empty value to the key "A" in the write set.
- C. getstate("A") function returns the current state of the key "A".
- D. All transaction histories which updated the state "A" are deleted from the ledger.
Answer: A
Explanation:
In Hyperledger Fabric, when a transaction that includes thedelState("A")function is committed, it results in the removal of the state of the key "A" from the current state database. However, the history of all transactions that have affected the key "A" remains intact in the ledger. This operation ensures that while the current state reflects the deletion, the immutability and traceability of the ledger are preserved, allowing for auditability and verification of past states. Options such as setting an empty value to the key or altering the transaction history are not supported, as they would violate the principles of immutability and transparency central to blockchain technology. Therefore, the correct outcome of adelState("A")operation is that the current state of "A" is deleted, but its transaction history remains accessible in the ledger.
NEW QUESTION # 25
In a production environment, what peer items require on-going monitoring?
- A. Only the orderer service since it manages the ordering of transactions.
- B. Only the chaincode containers since they handle the business logic.
- C. All peer containers, including their CPU, network, and memory.
- D. Onlythe peer nodes that are runningchaincode, since they consume most resources.
Answer: C
Explanation:
In a production environment of Hyperledger Fabric, it is essential to monitor all peer containers comprehensively, including their CPU, network, and memory usage. This is because each peer node plays a critical role in maintaining the network's overall health and efficiency. Monitoring these resources helps in detecting potential bottlenecks or failures early, ensuring the smooth operation of the blockchain network.
Focusing only on specific components like the orderer service or chaincode containers would provide a limited view of the network's health and could lead to issues being overlooked. Comprehensive monitoring enables administrators to maintain optimal performance and reliability across the entire network.
NEW QUESTION # 26
The Gateway service manages which of the following activities on behalf of the client application?
- A. User enrollment and authentication
- B. Chaincode
- C. Transaction submission
- D. Channel management
Answer: C
Explanation:
In Hyperledger Fabric, the Gateway service manages the transaction submission process on behalf of the client application. This service simplifies the interaction with the network by abstracting the details of transaction construction, endorsement, and submission. The Gateway service assembles the necessary endorsements according to the relevant chaincode endorsement policies and submits the transaction to the ordering service.
This role of the Gateway enhances the usability and efficiency of transaction processing, reducing the complexity for client applications by handling these critical steps internally.
NEW QUESTION # 27
What is the difference between chaincode, transaction, and block events?
- A. Use setEvent, setTransactionEvent, setBlockEvent to emit chaincode, transaction and block events in the chaincode.
- B. They are pretty much the same both regarding functionality and programming effort as well.
- C. Chaincode events must be programmed in the smart contract, transaction and block events work out of the box
- D. Block events must be programmed in the smart contract, chaincode events work out of the box.
Answer: C
Explanation:
In Hyperledger Fabric, chaincode events, transaction events, and block events serve different purposes and are emitted differently. Chaincode events must be explicitly programmed into the smart contract. Developers need to use thesetEventmethod within the chaincode to emit custom events that applications can listen to. On the other hand, transaction and block events are generated by the system automatically. These events notify listening applications of new blocks added to the chain or transactions included in blocks, without requiring any additional programming effort within the smart contracts.
NEW QUESTION # 28
Which actions are combined into a single function by the Fabric Gateway client APIs to support transaction submission with a single line of code?
- A. Endorsement, Submit, and Commitment
- B. Endorsement and Commitment
- C. Validation and Commitment
- D. Ordering and Commitment
Answer: A
Explanation:
The Fabric Gateway client APIs in Hyperledger Fabric streamline the transaction submission process by combining endorsement, submission, and commitment into a single function. This allows client applications to efficiently manage transaction submissions with a single line of code, specifically through the SubmitTransaction()function. This consolidation simplifies the interaction model for applications, enabling a focus on business logic rather than the underlying blockchain infrastructure details .
NEW QUESTION # 29
Where would you generate a unique ID to represent an asset on the ledger?
- A. In a private data collection
- B. In a custom validation plugin
- C. In the client application
- D. In the smart contract
Answer: C
Explanation:
In Hyperledger Fabric, a unique ID to represent an asset on the ledger is typically generated in the client application before the transaction is submitted to the blockchain. This approach ensures that each asset has a unique identifier, which is crucial for tracking and managing assets throughout their lifecycle on the ledger.
NEW QUESTION # 30
What is necessary for a chaincode to become ready to commit on a channel?
- A. The policy Channel/Application/Writers must be satisfied.
- B. The policy /Channel/Application/LifecycleEndorsement must be satisfied.
- C. The chaincode must be previously installed on the channel's peers.
- D. The chaincode must have the endorsement policies correctly defined.
Answer: B
Explanation:
For a chaincode to become ready to commit on a channel in Hyperledger Fabric, it is necessary that the policy
"/Channel/Application/LifecycleEndorsement" be satisfied. This policy specifies who needs to approve the chaincode definition before it can be committed to the channel. It ensures that the chaincode deployment is endorsed according to the governance standardsagreed upon by the network participants, typically requiring a majority or other specified fraction of the organizations in the network to endorse the change. This lifecycle endorsement policy is key to maintaining a secure and agreed-upon update process for chaincodes on the channel.
NEW QUESTION # 31
What gRPC status code might you expect to be associated with an error invoking a transaction as a result of a transient failure, such as a network disconnection between the client application and Gateway peer?
- A. ABORTED
- B. DEADLINE EXCEEDED
- C. UNAVAILABLE
- D. FAILED PRECONDITION
Answer: C
Explanation:
The gRPC status code "UNAVAILABLE" is commonly expected in scenarios involving transient failures in network communication, such as a disconnection between the client application and the Gateway peer. This status code indicates that the service is currently unavailable, often due to network issues or service downtime, making it suitable for situations where the failure is temporary and the request can be retried. This differs from other codes like "ABORTED" or "DEADLINE EXCEEDED," which represent different types of errors related to the transaction logic or timing issues, respectively. "FAILED PRECONDITION" would be inappropriate for network disconnections as it suggests issues with the request's preconditions, not the network status.
NEW QUESTION # 32
What is the purpose of the ordering service in Hyperledger Fabric model?
- A. To assemble transactions into blocks for the blockchain ledqer.
- B. To endorse transactions and update the world state.
- C. To validate transactions and maintain the blockchain ledqer
- D. To manage the identities of the participants in the network
Answer: A
Explanation:
The primary purpose of the ordering service in Hyperledger Fabric is to assemble transactions into blocks and ensure their correct sequencing on the blockchain ledger. This service takes validated transactions, orders them chronologically, and packages them into blocks. These blocks are then distributed to all peers on the network for final validation and commitment to their respective ledgers. This process is crucial for maintaining the integrity and consistency of the ledger across the distributed network. The ordering service does not manage identities or endorse transactions, nor does it validate transactions or directly maintain the blockchain ledger beyond the sequencing and packaging of transactions.
NEW QUESTION # 33
An endorsement policy lists what?
- A. The identities required for endorsing a transaction.
- B. The number of peers needed to endorse a transaction.
- C. The number of organizations involved in a transaction.
- D. The order in which transactions are executed.
Answer: A
Explanation:
In Hyperledger Fabric, an endorsement policy specifies which network participants, identified by their digital identities, must endorse a transaction before it can be considered valid. This is crucial for the network's security and integrity, as it controls how transactions are approved andadded to the ledger. Endorsement policies are part of the channel configuration and can be customized to fit the specific needs of a business network. They dictate the necessary endorsements from specific organizations or even particular roles within those organizations, ensuring that only authorized entities can validate transactions. This mechanism supports the collaborative yet secure nature of the enterprise blockchain, where trust is decentralized across different organizations that are part of the network.
NEW QUESTION # 34
How can the client application access descriptive error text for each of the endorsing peers following a transaction endorsement failure?
- A. Look up the gRPC status code for the error.
- B. Examine the message of the associated cause or wrapped error.
- C. Extract the details associated with the returned error.
- D. Extract relevant entries from the endorsing peer logs.
Answer: C
Explanation:
When a client application encounters a transaction endorsement failure in Hyperledger Fabric, the most effective way to access descriptive error text for each endorsing peer is to extract the details associated with the returned error. This error information typically includes details about why the endorsement was unsuccessful, providing insights into issues such as policy violations or execution failures. This method is more direct and informative compared to extracting logs or examining generic error messages and helps developers and administrators quickly diagnose and address issues in transaction processing.
NEW QUESTION # 35
In Raft, there are two places for configuration. One is local configuration. What is the other?
- A. Consensus configuration
- B. Peer configuration
- C. Global configuration
- D. Channel configuration
Answer: D
Explanation:
In Raft, configuration occurs at two levels: local and channel. The local configuration pertains to node-specific settings such as TLS communication and file storage. The channel configuration, on the other hand, defines the membership and operational parameters of the Raft cluster for a specific channel, including settings like heartbeat frequency and leader timeouts. This dual-level configuration allows for precise control over the behavior of Raft nodes within the Hyperledger Fabric network .
NEW QUESTION # 36
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