File Info
| Exam | BTA Certified Blockchain Developer - Hyperledger |
| Number | CBDH |
| File Name | Blockchain.CBDH.PracticeTest.2019-04-12.55q.tqb |
| Size | 226 KB |
| Posted | Apr 12, 2019 |
| Download | Blockchain.CBDH.PracticeTest.2019-04-12.55q.tqb |
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Demo Questions
Question 1
Chaincode in Hyperledger Fabric is a decentralized transactional program which is running on the validating nodes. Chaincode implements the Chaincode interface in particular, Init and Invoke functions.
Which two statements about Chaincode is correct? (Select two.)
- Init is called during instantiate transaction after the chaincode container has been established for the first time, allowing the chaincode to initialize its internal data
- Invoke is called to update or query the ledger after a proposal transaction. Update state variables are committed to the ledger before the transaction is committed
- Init is called during Instantiate transaction after the chaincode ledger has been established for the first time, allowing the chaincode to initialize its internal data
- Invoke is called to update or query the ledger in a proposal transaction. Updated state variables are not committed to the ledger until the transaction is committed.
Correct answer: AD
Explanation:
Chaincode is a decentralized transactional program, running on the validating nodes. As with every chaincode, it implements the Chaincode interface in particular, Init and Invoke functions. Init is called during Instantiate transaction after the chaincode container has been established for the first time, allowing the chaincode to initialize its internal data. Invoke is called to update or query the ledger in a proposal transaction. Updated state variables are not committed to the ledger until the transaction is committed. Chaincode is a decentralized transactional program, running on the validating nodes. As with every chaincode, it implements the Chaincode interface in particular, Init and Invoke functions. Init is called during Instantiate transaction after the chaincode container has been established for the first time, allowing the chaincode to initialize its internal data. Invoke is called to update or query the ledger in a proposal transaction. Updated state variables are not committed to the ledger until the transaction is committed.
Question 2
Blockchain solutions are comprised of four building blocks. Which of the following answers list the building blocks?
- Shared ledger, Privacy, Trust, and Smart Contracts or (Chaincode)
- Shared ledger, Centralization, Trustless, and Smart Contracts or (Chaincode)
- Shared ledger, Privacy, Trustless, and Smart Contracts or (Chaincode)
- Shared ledger, Centralization, Trust, and Smart Contacts or (Chaincode)
Correct answer: A
Question 3
An_____________ is defined as a communication node that is responsible for the distribution of blockchain transactions in Hyperledger Fabric.
- MSP
- Peer Node
- Client Node
- Endorsing Node
- Orderer
Correct answer: E
Explanation:
Orderer Ordering services handles the main function of the Hyperledger Fabric to maintain consistency in the transactions processes. Ordering services provides a shared communication to clients and peers and helps in broadcasting the messages containing transactions. Orderer Ordering services handles the main function of the Hyperledger Fabric to maintain consistency in the transactions processes. Ordering services provides a shared communication to clients and peers and helps in broadcasting the messages containing transactions.
