Chaincode Development, Deployment, and Lifecycle Management BDC Practice Questions (Page 7)

Questions 31–34

1. 31application · medium

   A chaincode function allows users to update an asset's details. The developer wants to restrict updates to users who have a specific attribute 'role=admin' in their certificate. What is the best way to enforce this?

   • AStore a list of admin users in the chaincode state and check against it.
   • BParse the certificate manually using the stub's GetCreator and extract the attribute.
   • CUse the ClientIdentity library to check the attribute 'role' and compare it to 'admin'.
   • DRely on the peer's MSP to allow only admin users to invoke the chaincode.
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2. 32foundation · easy

   In Hyperledger Fabric, which programming languages are officially supported for writing chaincode?

   • AGo, C#, and PHP
   • BC++, Python, and Rust
   • CGo, Java, and Node.js
   • DSolidity, Go, and JavaScript
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4. 33application · medium

   A production Hyperledger Fabric network has a chaincode that manages asset ownership. A bug was discovered in the chaincode's transfer logic, and the chaincode must be upgraded to version 2.0. The network has three organizations, and the endorsement policy requires signatures from two of them. What is the minimum set of steps required to upgrade the chaincode?

   • AInstall the new version on all peers, then invoke the chaincode's upgrade function to switch to the new version.
   • BInstall the new version on the peers of the two organizations that sign the endorsement policy, then commit the new definition to the channel.
   • CUpgrade the chaincode by using the peer chaincode upgrade command, specifying the new version and the same endorsement policy.
   • DPackage the new version, install it on all peers of all organizations, approve the new definition for each organization, and commit the new definition to the channel.
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5. 34foundation · easy

   In Hyperledger Fabric chaincode, which practice is most effective for improving performance?

   • APerforming heavy computations inside the chaincode to avoid external calls
   • BUsing complex queries that return large result sets
   • CMinimizing the number of state accesses by batching reads and writes
   • DWriting all data to a single key to reduce the number of keys
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