Blockchain CBDH BTA Certified Blockchain Developer - Hyperledger Fabric Exam Practice Test

Assembler languages are not web or html friendly nor high level.

Proposal is A transaction request sent from a client or admin user to one or more peers in a network; examples include deploy, invoke, query, or configuration request.

https://fabrictestdocs.readthedocs.io/en/latest/glossary.html

Hyperledger Caliper: A blockchain benchmark tool that allows users to measure performance of a specific implementation with predefined use cases Its in Alpha mode at time of writing. Contributed by developers from numerous organizations.

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Each enrolled user is granted an allocation of transaction certificates (tCerts).

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The application is bootstrapped knowing about a group of peers which are trusted by the application developer/administrator to provide authentic responses to discovery queries. There is the bootstrap of a peer network, during which policies, system chaincodes, and cryptographic materials (certs) are disseminated amongst participants, and the bootstrap of an ordering network. The bootstrap of the ordering network must precede the bootstrap of the peer network, as a peer network is contingent upon the presence of an ordering service. A network need only be “bootstrapped” once.

REST API support and integration capabilities: A LoopBack connector for business networks has been developed that exposes a running network as a REST API which can easily be consumed by client applications and integrate non-blockchain applications. This allows for easier front end application development without having to know the network internal application structure.

Getting started- Writing chaincode you will want to make sure that you have the Go programming language installed and correctly configured. Make sure that a directory is created for your chaincode application as a child

Hyperledger Composer is an 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.

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Code invoking transaction is an REST API call to a chaincode function and is similar to how a URL pattern invokes a servlet in J2EE. ServletServlet can be used to create a default mappings for servlets. For example, to create a default mapping to map all servlets to /myservlet/*, so the servlets can be called using http://host:port/web-app-name/myservlet/com/foo/FooServlet, add the following to your web.xml file. (The web.xml file is located in the WEB-INF directory of your Web application.) ServletServlet weblogic.servlet.ServletServlet ServletServlet /myservlet/*

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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.

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.

Validity rules (validation) state how the user and the transactions will be validated. This is predetermined by the consensus algorithm.

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

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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.

Distributed Ledger manages the world state and the transaction log in the blockchain. The world state is defined as the state of all transactions on the Blockchain, where all nodes agree that all blocks on the Blockchain are at the same state. It implements three key attributes. It efficiently calculates the cryptographic hash of the entire dataset of each block. It efficiently transmits a minimal “delta” changes to the dataset, when a peer is out of sync and needs to “catch up”. It minimizes the amount of stored data required for each peer to operate.

A REST (Representational State Transfer) Server is often used to proxy requests to Hyperledger chaincode. This provides a well defined process for accessing blockchain services.