Answer
Swarm uses libnetwork with built-in control plane; Kubernetes uses pluggable CNIs with independent data/control planes.
Quick Answer
Docker's overlay uses its own VXLAN control plane tightly coupled to the Docker daemon. Kubernetes CNI plugins are modular — any plugin implementing the CNI spec can manage networking (Flannel, Calico, Cilium, Weave). CNI plugins have richer policy support, eBPF options, and are decoupled from the container runtime.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ