What type of organization can be thought of as a corporation run without any human involvement
under the control of an incorruptible set of business rules?
B
Explanation:
Decentralized Autonomous Organization (DAO) can be thought of as a corporation run without any
human involvement under the control of an incorruptible set of business rules. A DAO can also be
seen as the most complex form of a smart contract, where the bylaws of the decentralized
organization are embedded into the code of the smart contract, using complex token governance
rules.
Chaincode in Hyperledger Fabric is a decentralized transactional program which is running on the
validating nodes. Chaincode implements the Chaincode interface in particular, Init and Invoke
functions.
Which two statements about Chaincode is correct? (Select two.)
A,D
Explanation:
Chaincode is a decentralized transactional program, running on the validating nodes. As with every
chaincode, it implements the Chaincode interface in particular, Init and Invoke functions. 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.
Blockchain solutions are comprised of four building blocks. Which of the following answers list the
building blocks?
A
An_____________ is defined as a communication node that is responsible for the distribution of
blockchain transactions in Hyperledger Fabric.
E
Explanation:
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 ledger system in Hyperledger Fabric uses what database by default?
B
Explanation:
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. LevelDB uses
very coarse-grained synchronization which forces all writes to proceed in an ordered, first-come-first-
served basis, effectively reduces throughput to a single thread. 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. Like the LevelDB key-value store,
CouchDB can store any binary data that is modeled in chaincode (CouchDB attachment functionality
is used internally for non-JSON binary data). But as a JSON document store, CouchDB additionally
enables rich query against the chaincode data, when chaincode values (e.g. assets) are modeled as
JSON data
Which of the following is a role in Fabric that has permission to create transactions and query
network data?
A
Explanation:
References:
Hyperledger is an open source project that came out of the ___________________________. It was
created in order to help advance _____________________________blockchain technologies. It's a
global open source collaboration involving leaders from numerous industries.
A
Explanation:
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.
A transaction in Hyperledger Fabric is a request to the blockchain to execute a function on the ledger.
By what the function is implemented?
A
Explanation:
Chaincode is programmatic logic. A transaction is a request to the blockchain to execute a function
on the ledger. The function is implemented by a chaincode. Aka smart contracts
References:
When your developing with Fabric Composer which of the following is true?
A
Explanation:
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.
Chaincode Services uses Docker to host (deploy) the chaincode without relying on any virtual
machine or computer language.
What would be the main reason or best reason that Hyperledger chose containers over virtual
machines?
A
Explanation:
Docker provides a secured, lightweight method to sandbox chaincode execution that is "locked
down" Chaincode Services uses Docker to host (deploy) the chaincode without relying on any virtual
machine or computer language. Docker provides a secured, lightweight method to sandbox
chaincode execution. The environment is a "locked down" and secured container, along with a set of
signed base images containing secure OS and chaincode language, runtime and SDK images for
Golang Additional programming languages can be enabled