Network Communication and Protocol Layers BDC Practice Questions (Page 3)

Questions 11–15

1. 11expert · hard

   A blockchain developer is designing a node for a public blockchain that must be resilient to network partitions. The node will be deployed in a cloud environment with multiple availability zones. Which deployment strategy best ensures the node remains connected to the network during a zone failure?

   • ADeploy multiple node instances across different availability zones and configure them to peer with each other and with external nodes.
   • BUse a load balancer in front of the node to distribute traffic.
   • CDeploy all node instances in a single availability zone to reduce latency.
   • DDeploy a single node instance with a highly available IP address.
   Reveal Solution Discussion Select an answer first
2. 12foundation · easy

   Which layer in a blockchain protocol stack is primarily responsible for enabling different blockchain networks to interact with each other?

   • AInteroperability layer
   • BApplication layer
   • CNetwork layer
   • DConsensus layer
   Reveal Solution Discussion Select an answer first
4. 13expert · hard

   A developer is building a blockchain for a supply chain where participants are known but not fully trusted. They need to prevent Sybil attacks while allowing new participants to join dynamically. Which approach is most appropriate?

   • AUse a public proof-of-work network to allow anyone to join
   • BUse a reputation system based on transaction history
   • CUse a static list of nodes that never changes
   • DUse a permissioned network with a certificate authority (CA) to issue identities
   Reveal Solution Discussion Select an answer first
5. 14application · medium

   A developer is explaining to a client why a blockchain network remains functional even if several nodes go offline. Which characteristic of blockchain networking is the primary reason?

   • ANodes use a satellite link to communicate, bypassing terrestrial networks
   • BEach node stores only its own transactions, so other nodes are irrelevant
   • CCentralized server that stores all data and distributes it to nodes
   • DDecentralized peer-to-peer architecture with redundant data propagation
   Reveal Solution Discussion Select an answer first
6. 15application · medium

   A developer is designing a blockchain protocol and needs to separate the concerns of data transmission, peer management, and consensus. Which layered architecture best achieves this separation?

   • ATransport layer (TCP), P2P layer (peer discovery and messaging), consensus layer (block validation and ordering)
   • BP2P layer (block validation), consensus layer (TCP transmission), transport layer (peer discovery)
   • CApplication layer (peer discovery), transport layer (consensus), network layer (block validation)
   • DSingle monolithic layer that handles all networking and consensus logic
   Reveal Solution Discussion Select an answer first