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What is necessary for a chaincode to become ready to commit on a channel?
Answer : C
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 standards agreed 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.
What is the role of the endorsement policy in the context of Hyperledger Fabric's chaincode?
Answer : D
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.
When reading and modifying the ledger state in Hyperledger Fabric, what type of schema does the data stored in the ledger need to adhere if the state database is LevelDB?
Answer : A
When using LevelDB as the state database in Hyperledger Fabric, there is no specific schema that the data stored in the ledger needs to adhere to. LevelDB is a key-value store, which does not enforce any schema on the data it holds. This flexibility allows applications to define their own formats and structures for the data they store, which can vary from simple strings and numbers to more complex serialized data structures. This schema-less nature of LevelDB enables developers to implement the data handling that best suits their application's needs without the constraints of a predefined database schema.
Which directory is created by the idemixgen tool along with the ca directory and msp directory when configuring membership?
Answer : B
Theidemixgentool is used to create configuration files for the Identity Mixer based MSP (Membership Service Provider) in Hyperledger Fabric.When configuring membership, theidemixgentool creates three directories:/ca/,/msp/, and/user/1. The/ca/directory contains the issuer secret key, issuer public key, and revocation key, which should only be present for a Certificate Authority (CA). The/msp/directory contains the issuer public key and revocation public key, which are required to set up an MSP that verifies Identity Mixer signatures.The/user/directory specifies a default signer configuration1. Therefore, the correct answer is the user directory, which is created alongside the ca and msp directories by theidemixgentool.
Which ordering does Pluggable Consensus support for Hyperledger Fabric?
Answer : A
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 .
