Blockchain Blockchain Developer - Hyperledger Fabric CBDH Questions & Answers

• Question 1:

  Hyperledger Fabric Ledger has two parts. What are they?

  A. Stateless Data and Snapshots

  B. State Data and Transaction Logs

  C. State Data and Membership Logs

  D. Stateful Data and Membership Logs

  E. State data and Snapshots

  Correct Answer: B

  Representation of current state of the assets. Asset state data can be changed upon changes to the state of the data. ?Transaction Logs: Record of all the transactions (in the order they are received) which modified the state data, and once the data is written it is immutable and cannot be changed.

• Question 2:

  Hyperledger Fabric is a blockchain implementation that is designed for deploying a modular and extensible

  architecture.

  Which of the following is NOT true about the architecture of Hyperledger?

  A. It is modular and extensible

  B. It allows for interoperability

  C. It has a native cryptocurrency token

  D. It has a rich API development capacity

  Correct Answer: C

  It has a modular subsystem design so that different implementations can be plugged in and implemented over time. Modular and extensible means modularity in all components of all frameworks, including: Consensus layer Smart contract layer Communication Layer Data Store Identity services (root of trust, to identify the participants).

• Question 3:

  Voting-based algorithms are advantageous in that they provide a benefit but a tradeoff. (Select two.)

  A. Trade off between scalability and security.

  B. Better security due to node control.

  C. Low-latency finality.

  D. Trade off between scalability and performance.

  Correct Answer: CD

  Hyperledger makes use of the permissioned voting-based consensus from the pool of other consensus named the lottery-based consensus. (Kafka in Hyperledger Fabric Ordering Service) Voting-based algorithms are advantageous in that they provide low-latency finality. More Nodes = More Time to reach Consensus. Trade off between Scalability and Performance

• Question 4:

  What is provided by the Hyperledger Fabric to facilitate network communications?

  A. SDK

  B. API

  C. Golang

  D. Java

  E. Middleware

  Correct Answer: A

  Hyperledger Fabric provides a Node.js and a Java SDK to facilitate network communications functionality.

• Question 5:

  What is the best description of how Kafka is utilized for consensus approach in Hyperledger Fabric?

  A. Kafka does not support crash tolerance but it does not offer protection against rogue nodes in the network.

  B. Provides Byzantine fault tolerance. Finality happens in a matter of seconds. Scale to petabytes of data, distributed across many clusters.

  C. Provides Byzantine fault tolerance. Finality happens in a matter of seconds.

  D. Permissioned voting based Leader does ordering. Only in-sync replicas can be voted as leader.

  Correct Answer: D

  Kafka essentially is a distributed, horizontally-scalable, fault-tolerant, commit log. The other answers are in correct.

• Question 6:

  The Hyperledger Project consists of the following EXCEPT?

  A. Infrastructure

  B. Tools

  C. Framework

  D. Management

  Correct Answer: D

  Management is not correct. The Hyperledger Project consists of the following Infrastructure - Ecosystems that accelerate open development and commercial adoption Frameworks ?A portfolio of differentiated approaches to business blockchain frameworks developed by a growing community of communities Tools

  - Typically built for one framework, and through common license and community of communities approach, ported to other frameworks hyperledger.org.

• Question 7:

  In Hyperledger not all Nodes are created equal. What are the three distinct types of nodes? (Select three.)

  A. MSP Nodes

  B. Ordered Nodes

  C. Channel Node

  D. Client Nodes

  E. Peer Nodes

  F. Endorser Node

  Correct Answer: BDE

  Client Node: That initiates the transaction 2. Peer Nodes: Commits Transaction and keeps the data in sync across the ledger 3. Ordered: They are the communication backbones and responsible for the distribution of the transactions

• Question 8:

  Hyperledger can best be described as which of the following?

  A. A Newer Version of Proof of Stake

  B. An IBM owned solution that is a single blockchain

  C. A newer version of Proof of Work

  D. An effort to advance cross-industry blockchain technologies

  Correct Answer: D

  An effort to advance cross-industry blockchain technologies. Hyperledger is an open source collaborative effort created to advance cross-industry blockchain technologies. It is a global collaboration, hosted by The Linux Foundation, including leaders in finance, banking, IoT, supply chain, manufacturing and technology.

• Question 9:

  Every chaincode has an ________________ policy which specifies the set of peers on a channel that must execute chaincode and endorse the execution results in order for the transaction to be considered valid.

  A. Endorsement

  B. Transaction

  C. Validation

  D. Chaincode

  Correct Answer: A

  Chaincode has an endorsement policy which specifies the set of peers on a channel that must execute chaincode and endorse the execution results in order for the transaction to be considered valid.

• Question 10:

  When deploying a database option there are some important things to consider from a deployment perspective. CouchDB and LevelDB can be deployed with Fabric. Which of the following is a true statement in regards to ledger deployment?

  A. A CouchDB database is closely co-located with a network node and runs in a separate operating system process

  B. A LevelDB database is closely co-located with a network node and runs in a separate operating system process

  C. A CouchDB database is closely co-located with a network node and it is embedded within the same operating system process

  D. A LevelDB database is closely co-located with a network node and it is embedded within the same operating system process

  Correct Answer: D

  A CouchDB database is closely co-located with a network node and it is embedded within the same operating system process.