Episode 62 — Switching vs Routing: Layer 2 vs Layer 3 decision patterns

CloudNetX scenarios often depend on whether a problem is confined to a local broadcast domain or requires subnet-level separation and policy enforcement, so this episode clarifies switching versus routing as different roles with different design implications. It defines Layer 2 switching as moving frames within a broadcast domain and Layer 3 routing as moving packets between subnets and zones. The first paragraph focuses on the decision patterns: switching supports local connectivity and simple adjacency, while routing supports segmentation, control boundaries, and scalable addressing. It also explains the importance of the default gateway as the point where traffic exits a subnet, because gateway placement and design affect both performance and the ability to enforce policy when traffic crosses boundaries. The episode frames Layer 2 as valuable but potentially risky at scale, because large broadcast domains can amplify faults and slow recovery.