Blockchain CBDH Exam Questions Instant Access

Question 1

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

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

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

CProvides Byzantine fault tolerance. Finality happens in a matter of seconds.

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

Answer : D

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

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Question 2

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

AInitialize

BInit

CUpdate

DInvoke

Answer : D

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.

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Question 3

The Hyperledger Project Framework of blockchains is meant for specific use cases for enterprise.

Which blockchain includes a novel consensus algorithm, Proof of Elapsed Time (PoET)?

AHyperledger Iroha

BHyperledger Fabric

CHyperledger Indy

DHyperledger Sawtooth

Answer : D

Hyperledger Sawtooth is a modular platform for building, deploying, and running distributed ledgers. Hyperledger Sawtooth includes a novel consensus algorithm, Proof of Elapsed Time (PoET), which targets large distributed validator populations with minimal resource consumption.

Question 4

Which Hyperledger Fabric ordering mechanism is recommended for production use?

ABFT

BKafka

CSBFT

DSOLO

Answer : B

Kafka is the Hyperledger Fabric ordering mechanism that is recommended for production use. This ordering mechanism utilizes Apache Kafka, an open source stream processing platform that provides a unified, high-throughput, low-latency platform for handling real-time data feeds.

Question 5

What type of node commits transactions & keeps the data in sync across the ledger?

ACommitted

BEndorsed

CClient

DPeer

Answer : D

Peer nodes commits Transaction & keeps the data in sync across the ledger. They are nodes that maintain the state and copy of a shared ledger. Peers are authenticated by certificates issued by MSP. In Hyperledger Fabric, there are three types of peer nodes depending upon the assigned roles.

Question 6

Composer Modeling Language is an object-oriented modeling language that defines the domain model for a business network definition. Essentially this is saved as a .cto file.

Which of the following is NOTa characteristics of a .cto file?

AIt represents a set of resource definitions that includes assets, transactions, participants, ana events.

BValues may not be assigned to any field variable.

CThe modeling language does not support multiple inheritance.

DIt is a single namespace in which all resource declarations are implicitly defined.

EWhen using Hyperledger Composer modeling language structure words ''asset'' and ''participant'' are reserved.

Answer : B

Values can be assigned to any field variable A CTO file consists of:

A single namespace, in which all resource declarations are implicitly.

The overall ''model'' defines the representation of assets.

A set of resource definitions that includes assets, transactions, participants, and events.

Values may be assigned to any field variable.

The option to import resources from other namespaces.

When using composer modeling language, the words ''asset'' and ''participant'' are reserved.

Asset ownership instance is defined in a relationship field. (symbol: o)

The modeling language does not support multiple inheritance.

Question 7

What function is used to call the shim.Start function below?

Aimport

Binit

Cmain

Dtype

Answer : C

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Blockchain BTA Certified Blockchain Developer - Hyperledger CBDH Exam Questions