BAC-L2-SUB-117Substrate / Polkadot SDK
Networking, discovery and synchronisation
The layer you ignore until the day a node stops syncing: peer discovery, gossip, synchronisation strategies.
- Level
- L2 — Appchain developer
- Duration
- 4 h
- Maintainer
- Polkadot / Substrate Lead Architect
Learning objectives
- 01Explain peer discovery and the role of bootstrap nodes
- 02Compare the available synchronisation strategies
- 03Diagnose a node that refuses to sync
Guided lab
Isolate a node from the network, reconnect it, and follow its resynchronisation step by step.
Independent lab
Measure sync time per strategy and turn the result into an operational recommendation.
Security angle
Eclipse attacks: cutting a victim off from honest peers, and the peer diversity that protects against it.
Assessment
Diagnostic report on a deliberately misconfigured node.