Public-works staff assume an NSX-T overlay removes the need for a physical IP fabric. What does virtual networking actually solve versus what the underlay must still provide?
Select an answer to reveal the explanation.
Short Explanation
Overlay is a new set of named streets drawn on top of the real roads—it does not pave over the roads. Tenants get their own logical networks, but the underlay still needs IP reachability and enough MTU for the tunnels. HA admission control and Carbon Black are different jobs.
Full Explanation
Virtual networking does not eliminate the physical fabric. NSX-T overlay provides tenant and logical independence—segments and gateways that are not tied to a particular VLAN topology—while the underlay remains a routed IP network that must carry encapsulated packets with sufficient MTU. Claiming the overlay removes ToR IP planning, treating it as Carbon Black encryption, or confusing it with vSphere HA admission control misstates what SDN solves.