Answer
Metadata stores exchange MAC-to-IP mappings for VXLAN routing.
Quick Answer
Docker overlay networks use VXLAN (Virtual eXtensible LAN) tunnels between hosts. Each host maintains a VXLAN Forwarding Database (FDB) that maps container MAC addresses to host IPs. When a container moves or restarts, the FDB entry is updated via the control plane (gossip protocol in Swarm, etcd in others).
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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