You learned how data center networks differ from campus designs.
Architecture: Spine-leaf replaced -tier for east-west traffic. Every server is hops from every other. ECMP uses all links.
Overlays: VXLAN creates virtual Layer over Layer . -bit VNI supports million networks. BGP EVPN is the control plane.
DCI: Interconnect extends networks between sites. Watch latency and failure domains.
Storage: FC is lossless block storage. iSCSI runs over IP. NAS is file-level.
Containers: Kubernetes has flat pod networking. CNI plugins implement it. Services are stable endpoints. Policies control traffic.