Question 1

Which Hyperledger Tool brings on demand as-a-service deployment model into the blockchain ecosystem in order to reduce the effort required to create, manage, and terminate blockchains?

Accepted Answer

B

Explanation: Hyperledger Cello is a blockchain provision and operation system, which helps manage blockchain networks in an efficient way. Cello is a tool that could be used for example by vendors and VARs to provide a BaaS to their customer base.

Question 2

What type of peer executes chaincode?

Accepted Answer

B

Explanation: Endorsing Peer Endorser peer Peers can be marked as Endorser peer (i.e. Endorsing peer). Upon receiving the “transaction invocation request” from the Client application the Endorser peer Validates the transaction. Check certificate details and roles of the requester. Executes the Chaincode (Smart Contract) and simulates the outcome of the transaction. But it does not update the ledger. At the end of the above two tasks the Endorser may approve to disapprove the transaction. As only the Endorser node executes the Chaincode (Smart Contract) so there is no necessity to install Chaincode in each and every node of the network which increases the scalability of the network.

Question 3

Which of the following is the BEST definition of Decentralization?

Accepted Answer

A

Explanation: Peer-to-Peer essentially uses data sharing, hosting hardware owned by many not few, fault tolerant, secure, lower performance. It’s common way to share files—a good example was Napster. Peer-to- peer (P2P) file sharing is the distribution of digital media such as software, videos, music, and images through an informal network in order to upload and download files. Typically, P2P software enables users to select which files to share. These files are indexed on a central server, making them available for other users to find and download.

Question 4

What type of certificates act as secure identifiers, digital passports which contain information about the owner in Hyperledger Fabric certificate management?

Accepted Answer

D

Explanation: X509 certificates are used in Hyperledger Fabric. An X.509 certificate is any certificate under the X.509 specification standard for public key infrastructure and Privilege Management Infrastructure (PMI). The X.509 provides standardized formats for: Attribute certificates Public key certificates Certificate revocation lists Certification validation algorithms

Question 5

What is the application that is used by Hyperledger Fabric to communicate with the network?

Accepted Answer

A

Explanation: Hyperledger Fabric includes the REST and JSON RPC APIs, events, and an SDK for applications to communicate with the network.

Question 6

The CA (Certificate Authority) in Hyperledger Fabric issues the certificates. These certificates are
used for identity validation and for transmission of encrypted data that only the owner (person,
organization or software) of a specific certificate is able to decrypt and read.
What types of certificates are issued by the CA?

Accepted Answer

A, B, C

Explanation: Rootcert, tcert and ecert. As The CA (Fabric CA by default) issues a root certificate (rootCert) to each member (organization or individual) that is authorized to join the network. The CA also issues an enrollment certificate (eCert) to each member component, server-side applications and occasionally end users. Each enrolled user is granted an allocation of transaction certificates (tCerts). Each tCert authorizes one network transaction.

Question 7

The Hyperledger Project has a modular umbrella schema to its organization which includes three
parts of the organizational schem
a. As part of the organizational schema, it includes an “Infrastructure” Module that is structured with
four layers.
What layer below is NOT part of the structure?

Accepted Answer

A

Explanation: The Infrastructure Module includes the following four modules: Technical, Legal, Marketing, and Organizational.

Question 8

What must implement every chaincode?

Accepted Answer

B

Explanation: Chaincode Interface is required and supports Go, Node.js or Java.

Question 9

_________is called to update or query the ledger in a proposal transaction. This is called by the chaincode.

Accepted Answer

D

Explanation: Invoke is called to update or query the ledger in a proposal transaction. 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 10

In Hyperledger Fabric each channel will manage its own _______ and ________? Select best answer

Accepted Answer

D

Explanation: Chaincode may be deployed on multiple channels, each instance is isolated within its channel. Each channel maintains their own chaincode and ledger.

Question 11

Members of the Hyperledger Fabric DLT network may be allowed to issue certificates to their employees and for their infrastructure

Accepted Answer

B

Question 12

Chaincode interface must be implemented by ever chaincode program.

Accepted Answer

A

Explanation: References:

Question 13

All of the modeling components MUST be defined in a single file.

Accepted Answer

A

Question 14

Concepts, like other resources, can be instantiated

Accepted Answer

A

Question 15

Transaction Log Data is immutable i.e , once its written to the log it cannot be changed or deleted.

Accepted Answer

A

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