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Hyperledger Fabric
Certified Practitioner
(HFCP) Exam
Version: Demo
[ Total Questions: 10]
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Linux Foundation
HFCP
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Question #:1
Which of the following is the correct role of orderer nodes?
Order and package endorsed transactions into a block.
Order new tokens from the token issuer.
Order peers to endorse a transaction.
Reorder stored blocks to compress data volume.
Answer: A
Explanation
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
Question #:2
Which arguments must be supplied when a client application uses the Fabric Gateway client API to create a
Gateway connection to a Fabric network?
connection and client identity
Connection profile and client private key
Client public key and signing implementation
Client X.509 certificate and private key
Answer: D
Explanation
When a client application uses the Fabric Gateway client API to create a Gateway connection to a Hyperledger
Fabric network, it must supply the client's X.509 certificate and private key. The X.509 certificate is used to
authenticate the client to the network, confirming the client's identity and permissions. The private key is used
for signing transactions, which is necessary for the network to validate the integrity and origin of the
transactions submitted by the client. This combination ensures that both the identity of the client is verified
and that transactions cannot be tampered with without detection.
Question #:3
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How would a developer iteratively test and develop a smart contract without the overhead of the smart contract
lifecycle process for every update?
Runningchaincode for Smart Contracts in development mode.
Manually update the Smart Contract code on the network.
Deploy the Smart Contract on the network for every update.
Use a Production Network to test and develop Smart Contracts.
Answer: A
Explanation
For developers looking to iteratively test and develop smart contracts in Hyperledger Fabric without the
overhead of the full lifecycle process for each update, the recommended approach is to run the chaincode in
development mode. This mode allows developers to test and debug chaincode directly on their machines
without having to package, install, approve, and commit changes on the network each time. Development
mode simplifies the iterative development process by allowing direct interaction with the chaincode during its
development, making it easier to make and test changes quickly and efficiently. This contrasts with other
methods that involve manual updates, redeployments, or using a production network, all of which are more
time-consuming and complex.
Question #:4
What is the role of the endorsement policy in the context of Hyperledger Fabric's chaincode?
Define which organizations are allowed to read the ledger.
Define the organizations that have permission to execute a transaction.
Define which orderers will order transactions into a block.
Define the organizations that must sign a transaction proposal.
Answer: D
Explanation
In the context of Hyperledger Fabric's chaincode, the endorsement policy plays a crucial role in defining the
organizations that must sign a transaction proposal before it can be considered valid. This policy specifies
which members of the network must agree (endorse) a transaction for it to be executed. The policy can require
signatures from one or more specific organizations,depending on the chaincode's business logic and the
network's governance requirements. This ensures that transactions are agreed upon by the relevant
stakeholders, maintaining the integrity and trust within the network.
Question #:5
In Hyperledger Fabric, Intercommunication is how a smart contract in a channel updates the World State
database. It is achieved by what process?
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Setting the endorsement policy to communicate with all peers.
Configuring the Peer-to-peer endorsement options.
Calling smart contracts within the channel and in different channels.
Making use of the cross channel Consensus mechanism.
Answer: C
Explanation
Intercommunication in Hyperledger Fabric regarding how smart contracts update the World State database is
primarily achieved by calling other smart contracts, both within the same channel and across different
channels. This process allows smart contracts, also known as chaincode, to interact and transact across the
network, updating the World State as necessary based on business logic defined in the contracts. This
capability is crucial for complex business processes that span multiple contracts and possibly multiple
channels. Unlike setting endorsement policies or configuring peer-to-peer options, calling other smart
contracts directly facilitates dynamic and direct interaction between business processes, enhancing the
modularity and efficiency of the network. Cross-channel communication must be carefully managed within the
permissions and policies defined in the network to maintain security and integrity.
Question #:6
Which actions are combined into a single function by the Fabric Gateway client APIs to support transaction
submission with a single line of code?
Validation and Commitment
Endorsement, Submit, and Commitment
Ordering and Commitment
Endorsement and Commitment
Answer: B
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
function. This consolidation simplifies the interaction model for applications, enabling aSubmitTransaction()
focus on business logic rather than the underlying blockchain infrastructure details .
Question #:7
When building a test network, how many nodes are adequate for an Ordering Service?
There is no set number of nodes required for an Ordering Service.
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Three ordering nodes are needed for a test Ordering Service.
One ordering nodes is sufficient for an Ordering Service.
Ordering Service nodes are optional in a test network.
Answer: C
ExplanationFor 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.
Question #:8
In Hyperledger Fabric, what data structures manage sensitive information between organizations?
Private data collections
State database
Ordering service
Endorsement policies
Answer: A
Explanation
In Hyperledger Fabric, "private data collections" are used to manage sensitive information between
organizations. This feature allows specified subsets of data to be shared among a defined group of network
participants while keeping it hidden from others, thus maintaining confidentiality and privacy across the
network. Private data collections enable organizations to transact privately without having to establish a
separate channel, significantly reducing the overhead associated with channel management .
Question #:9
Which ordering does Pluggable Consensus support for Hyperledger Fabric?
CFT (Crash Fault Tolerant) only
PCFT (Pure Crash Fault-Tolerant)
BFT (Byzantine Fault-Tolerant) only
Proof of BFT (Byzantine Fault-Tolerant)
Answer: A
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Explanation
Hyperledger Fabric supports pluggable consensus mechanisms that allow the system to be tailored to specific
trust assumptions of a deployment. The platform allows for the implementation of various consensus
protocols, including Crash Fault Tolerant (CFT) and Byzantine Fault Tolerant (BFT). However, the specific
support for only CFT or BFT would depend on the implementation choice within the context of the
deployment's trust model. Fabric's modular architecture supports well-established consensus protocols for both
CFT and BFT .
Question #:10
What allows users to update channels, or invoke new Smart Contracts?
CouchDB
Private data collections
The peer CLI
Endorsement policies
Answer: C
Explanation
In Hyperledger Fabric, the peer CLI (Command Line Interface) tool is used to update channels or invoke new
smart contracts. This utility allows users to perform various administrative tasks on the network, such as
updating the ledger, changing endorsement policies, and managing chaincode installations and instantiations .
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