Summary
- Logical redundancy can still share power, fibre, software, control plane or operator access.
- Architecture becomes testable when each failure domain has an owner, isolation boundary and recovery path.
Network architecture organises devices, protocols and traffic paths to deliver a service. Its quality is revealed by dependencies rather than box count. Two routers in one rack, two carriers in one conduit or two controllers under one credential may be one failure domain. Teams should mark physical and logical boundaries, management access, data flow and manual fallback on the same model. The next evidence is a controlled fault that removes one domain and measures impact. Resilience should be observed, not inferred from duplicated icons.
