City disaster-recovery tests fail because stretching Layer 2 across sites on the physical network is fragile. Which traditional challenge should the operator identify?
Select an answer to reveal the explanation.
Short Explanation
Stretching a VLAN across two civic sites on the physical plant is a long, brittle extension cord. Overlays can keep Layer-2 adjacency without that physical stretch. Disaster-recovery tests should not depend on spanning tree and flooded VLANs surviving the WAN.
Full Explanation
Traditional disaster-recovery designs that stretch VLANs across sites inherit large failure domains, spanning-tree and loop risk, and operational fragility. Overlay networks decouple logical Layer-2 adjacency from the physical stretch method, so VMs can remain on the same logical segment without extending the underlay VLAN across the WAN. This item is identify-level: overlays address the problem; it is not a professional DCI design exercise. Horizon Cloud Pod Architecture and vSAN iSCSI are not the NSX overlay answer.