01 · Separate the cores
Separate the internet and intranet cores
02 · Classic three-tier
HA firewalls → core aggregation → top-of-rack
03 · Spine–leaf fabric
Clos architecture, fully redundant L3 pathing
04 · Spine–leaf, single firewall layer
One HA pair, both edge routers
05 · Production topology
Every tier drawn as a redundant pair
06 · Corrected switch design
Same topology as 05, with the core split by traffic direction