IBM Block chain Foundation Developer cognitive class Exam Answers:-

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Course Name :- IBM Block chain Foundation Developer

 IBM Blockchain Foundation Developer cognitive class final exam Answers:-

Question 1 : A developer has installed the IBM Blockchain Platform VS Code extension but cannot see the Fabric Environments, Smart Contracts, Fabric Wallets and Fabric Gateways views. Where should they click?

• the IBM Blockchain Platform icon in the VS Code activity bar
• the ‘View homepage’ icon
• the Smart Contract project in the Explorer view
• the ‘IBM Blockchain Platform’ extension in the Extensions Marketplace

Question 2 : How can a developer quickly show all the available commands implemented by the IBM Blockchain Platform extension?

• Click the “Tutorials” link from the extension homepage.
• From the VS Code main menu, click “View” -> “IBM Blockchain Platform”.
• Right-click the IBM Blockchain Platform icon in the activity bar.
• Click “View” -> “Command Palette” and enter “>IBM Blockchain Platform”.

Question 3 : Which of the following is a deterministic value for a smart contract to calculate and store in the world state?

• the n’th digit of pi, where n is supplied as an input parameter to the transaction
• the number of milliseconds since 00:00 1 January 1970
• a random number between 1 and 1000
• the DHCP address of the peer running the smart contrac

Question 4 :  A transaction’s signature in a Hyperledger Fabric TypeScript smart contract is decorated with “@Transaction(false)”. What does this mean?

• This transaction should be hidden from the list of transactions that this smart contract exposes.
• This transaction should be exposed as a read-only transaction.
• This transaction should be exposed as a transaction that takes no parameters.
• This transaction should be exposed as a transaction that has no module dependencies.

Question 5 :  A developer is using the IBM Blockchain Platform VS Code extension to create a skeleton TypeScript smart contract project, which will be instantiated as “DemoContract@0.0.1”. From where is this name and version derived?

• the name of the enclosing project folder
• the smart contract Typescript source file name
• the file ‘tsconfig.json’
• the file ‘package.json’

Question 6 : In the Fabric Environments view of the IBM Blockchain Platform VS Code extension, a smart contract is listed under “Installed” but not under “Instantiated”. What does this mean for the smart contract?

• It has been started but no transactions have been run.
• It probably contains compilation errors.
• It has been built but not packaged.
• It has been copied to the peer(s) but not started.

Question 7 : Which view in the IBM Blockchain Platform VS Code extension shows a single connection to a Hyperledger Fabric network using a supplied identity?

• Fabric Gateways
• Fabric Environments
• Smart Contracts
• Fabric Wallets

Question 8 : In Hyperledger Fabric, what is the difference between a submitted transaction and an evaluated transaction?

• Submitted transactions are recorded on the blockchain ledger; evaluated transactions are not.
• Submitted transactions take place on a single peer; evaluated transactions run across multiple peers.
• Submitted transactions run in real-time; evaluated transactions are batched.
• Submitted transactions are called on behalf of another organization; evaluated transactions are not.

Question 9 : In order to connect a standalone application to the Hyperledger Fabric instance embedded in the IBM Blockchain Platform VS Code extension, which of the following must be exported?

• Ordering Service
• Connection Profile
• Fabric Environment
• Smart Contract

Question 10 : A developer is writing a standalone TypeScript application to submit a transaction to a Hyperledger Fabric network. Against which object is the submitTransaction method called?

• Wallet
• contract
• network
• gateway

Question 11 : A developer is using the IBM Blockchain Platform VS Code extension to upgrade the version of a smart contract running on an instance of Hyperledger Fabric V1.x.  What will happen to the old version of the smart contract when they do this?

• The old version of the smart contract will no longer be listed as instantiated.
• The old version of the smart contract will be uninstalled from the peer.
• The old version of the smart contract will be removed from the Smart Contracts view.
• The old version of the smart contract will be installed to a backup channel.

Question12 : A developer has used the IBM Blockchain Platform VS Code extension to make a change to a smart contract and its version identifier. Typically, what will they then do in the Smart Contracts view to package the modified smart contract so that the new version appears there?

• Delete the old smart contract package; this causes an automatic repackaging.
• Select the old smart contract and drag it onto the Package icon.
• Click the ellipsis (‘…’) and select the “Package Open Project” option.
• Right-click the old package and select the “Upgrade Smart Contract” option.

Question 13: When using the IBM Blockchain Platform VS Code extension, which of the following tasks can be done directly in the debug bar of the VS Code debugger?

• execute a transaction
• query the block height
• endorse a transaction
• start a peer

Question 14 : How does a developer know that a smart contract is under an active debug session in the IBM Blockchain Platform VS Code extension?

• The VS Code debug side bar is visible.
• The status bar at the bottom of the screen is a different color, and shows the text “Debug Smart Contract”.
• The smart contract source file will have a breakpoint indicator.
• The IBM Blockchain Platform icon in the activity bar has a red notification decorator.

Question 15 : For which object in the IBM Blockchain Platform VS Code extension can tests be generated?

• channel
• smart contract
• peer
• wallet

Question 16 : Assuming an otherwise working environment, what is the most likely result of running a functional test that has been generated by the IBM Blockchain Platform VS Code extension, but that has not yet been customized?

• The test will complete and pass.
• The test will complete with an error message.
• The test will prompt for input parameters.
• The test will not compile.

Question 17 : What two pieces of information are supplied by the smart contract when emitting an event?

• the transaction name and input parameters
• the smart contract name and endorsement policy
• the read set and the write set
• the topic name and payload

Question 18 : A developer uses the “Subscribe to Events” feature in the IBM Blockchain Platform VS Code extension. For how long does the subscription persist?

• until the next block is committed
• until the first event is triggered
• until the gateway is disconnected
• until the developer selects the “Unsubscribe from Events” option

Question 19 : In a Hyperledger Fabric-based network, which of the following are responsible for executing smart contract code?

• client applications
• all peers on the channel
• ordering service nodes
• endorsing peers

Question 20 :  Three organizations use Hyperledger Fabric to share transaction data. They each conect to the same single peer that is run by a network service provider, and identify themselves to each other using certificates provided by a shared certificate authority. What is a problem with this scenario?

• there is a single point of trust
• only one smart contract can be deployed
• new members cannot join the network
• each organization must use the same client application