Example Concept: VLANs (Virtual Local Area Networks) allow network administrators to partition a physical network into multiple logical networks. In a multi-tenant data center, VLANs are used to isolate tenant traffic, ensuring that data from one tenant does not interfere with another. This setup enhances security by limiting broadcast domains and can be managed using VLAN tagging (802.1Q) on switches to maintain clear separation. Implementing VLANs requires careful planning of IP addressing, trunking between switches, and integration with firewalls to enforce security policies.