Network Design & Administration Flashcards

What is the role of a gossip leader peer in an organization?

Answer: It pulls blocks from the ordering service and distributes them to other peers in its org

The leader connects to the orderer and disseminates blocks via gossip.

What is the correct order of Fabric 2.x chaincode lifecycle steps?

Answer: Package, install, approve, commit

Chaincode is packaged, installed on peers, approved by orgs, then committed to the channel.

What does a private data collection put on the channel ledger?

Answer: A hash of the private data, with the data itself held only by authorized peers

Only hashes appear on the shared ledger; authorized orgs keep the data in a side database.

Which endorsement policy requires approval from both Org1 and Org2 peers?

Answer: AND('Org1.peer','Org2.peer')

AND requires endorsements from every listed principal.

Which state database should be used if chaincode needs rich JSON queries?

Answer: CouchDB

CouchDB supports rich queries on JSON values; LevelDB supports only key and range queries.

What is a main benefit of chaincode as an external service?

Answer: Chaincode runs in its own container or process outside the peer, so it can be managed independently

External chaincode lets operators run and scale chaincode via Kubernetes without the peer building Docker images.

Which component stores the current values of all keys for a channel on a peer?

Answer: World state database

The state database holds the latest committed key values, while block files hold the transaction history.