Top Tips for Passing the Blockchain CBDH Exam on Your First Try

Gossip Protocol The gossip data dissemination protocol performs three functions Manages peer discovery and channel membership Disseminates ledger data across all peers on the channel Syncs ledger state across all peers on the channel.

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SOLO is the Hyperledger Fabric ordering mechanism most typically used by developers experimenting with Hyperledger Fabric networks. SOLO involves a single ordering node and Note Development Only.

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.

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.

Orderer Ordering services handles the main function of the Hyperledger Fabric to maintain consistency in the transactions processes. Ordering services provides a shared communication to clients and peers and helps in broadcasting the messages containing transactions.

The REST server uses a business network card specified during startup to connect to and discover the assets, participants, and transactions within a deployed business network. This information visibility is required in order to generate the REST API. This business network card is known as the discovery business network card. By default, the discovery business network card is also used to handle all requests to the REST API.

Consensus is when the distributed ledger has been updated and all nodes maintain their own identical copy of the ledger. 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.