Linux Foundation Hyperledger Fabric Certified Practitioner HFCP Exam Questions

Answer : D

In Hyperledger Fabric, if a user submits a transaction with no matching function specified in the smart contract, the unknownTransaction function is invoked by default. This function serves as a catch-all method that can be used to handle cases where the transaction type is not recognized, providing a mechanism to manage or log these occurrences effectively .

Answer : C

In Hyperledger Fabric, private data collections are designed to enhance privacy and confidentiality by allowing only specified members of a collection to access the stored data. These members are pre-configured when the private data collection is defined. While the actual data is restricted to these configured members, hash values of the data are distributed and stored on the ledger accessible by all organizations in the channel. This method ensures data confidentiality while still providing a way to verify data integrity across the entire channel, as other organizations can see the hash values but not the actual data itself.

Answer : B

In Hyperledger Fabric, block events are provided by peers. Whenever a block is committed to a peer's ledger, that peer generates a corresponding event. These events can include the full block content or a summary of the transactions within the block, allowing applications to register and receive notifications about these events. This setup is crucial for applications that need to respond to changes recorded on the blockchain in real-time .

Answer : D

In Hyperledger Fabric, the correct subcommand to add a peer to a channel is peer channel join. This command is used by a peer node to join an existing channel. The command requires a block to be specified which typically is the genesis block of the channel, allowing the peer to synchronize with the channel's ledger from the beginning. Other commands like peer channel fetch, peer channel create, and peer channel update serve different purposes. peer channel fetch retrieves blocks from a channel, peer channel create is used to set up a new channel, and peer channel update modifies channel settings. Thus, peer channel join is the specific command used to connect a peer to a channel.

Answer : A

The primary role of orderer nodes in Hyperledger Fabric is to order and package endorsed transactions into blocks. Orderers receive transactions from various peers, ensure that these transactions are in a consistent order, and then package them into blocks that are subsequently appended to the blockchain. This function is crucial for maintaining the consistency and integrity of the ledger across all participating nodes. Orderer nodes do not issue tokens, enforce peer endorsements, or reorder stored blocks for data compression. Instead, their main function is integral to the consensus and ledger maintenance processes within a Hyperledger Fabric network

Answer : A

In Hyperledger Fabric, a range query with a start and end key is a type of query that searches for all ledger entries whose keys fall within the specified range defined by the startKey and endKey. This is used, for example, to retrieve a subset of assets from the ledger based on their key values, effectively iterating over a specified range .

Answer : C

The Operations Service API hosted on the HTTP server by the peer and the orderer in Hyperledger Fabric does not provide the functionality to set the log level. This API is primarily designed to offer operational insights and controls like retrieving log data, fetching metrics, and performing health checks. The ability to dynamically adjust the log level via this API is not supported, as logging levels are typically configured statically through configuration files or environment variables at the time of node startup. This design helps maintain the integrity and stability of the operational log data.