CBDH Practice Exam Questions with Answers BTA Certified Blockchain Developer - Hyperledger Fabric Certification

This web-based tool allows developers to learn Hyperledger Composer, model out their business network (domain), test that network, and deploy that network to a live instance of a blockchain network. The playground keeps the development model in browser storage, allowing them to be easily uploaded or downloaded. The playground also allows for CRUD (create, read, update, delete) operations to be performed on asset transactions which are created and logged. Composer playground offers a repository of sample business networks that can provide a base for building your own business network.

There is a new open-source application development framework, which simplifies the creation of Hyperledger Fabric blockchain applications, thus reducing the time and complexity of development. The tool aims at helping users to create blockchain applications based on Hyperledger Fabric without needing to know the low-level (Go Programming) details involved in blockchain networks.

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.

Hyperledger is an open source project that came out of the LF and was created in order to help advance cross-industry blockchain technologies. It's a global open source collaboration involving leaders from numerous industries.

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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).

Reputation Manager is part of the MSP Membership services provide identity, privacy, and confidentiality to the network. Basic access to the network is determined through the role of the member, who may all have separate legal and/or independent entities. Depending on the network, different authentication schemes are used for assigning identity. For transacting, the participants must obtain identities. The Reputation Manager enables auditors to view transactions pertaining to a participant, providing that each auditor has been granted proper access authority, based on the role of the participants.

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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.

Rich Query Language capability is available with CouchDB. What DB is used? The ledger system in Hyperledger fabric uses levelDB. By definition, LevelDB allows concurrent writers to safely insert data into the database by providing internal synchronization State database options include LevelDB and CouchDB. LevelDB is the default key-value state database embedded in the peer process. CouchDB is an optional alternative external state database. (Binary data)

https://hyperledger-fabric.readthedocs.io/en/release-1.3/fabric_model.html

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

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Consensus is when the distributed ledger has been updated and all nodes maintain their own identical copy of the ledger which essentially is an agreement. This is also known as the “World State” in some blockchains. This architecture allows for a new capacity as a system of recordkeeping that goes beyond being a simple database.