In VMware Cloud Foundation (VCF), network segments (both overlay and VLAN-backed segments) are created and managed through VMware NSX, specifically via the NSX Manager interface.

The VCF 9.0 Networking documentation states that:

“NSX Manager provides centralized management for logical switching, routing, security, and segment creation within a workload domain.”

A network segment in VCF corresponds to an NSX logical segment, which is used to provide Layer 2 connectivity to workloads. These segments are defined within NSX and can be attached to Tier-0 or Tier-1 gateways depending on routing requirements.

Other options are incorrect:

vCenter (A) manages ESXi hosts and VMs but does not create NSX logical segments.

VCF Operations (C) is used for monitoring and analytics, not configuration.

SDDC Manager (D) handles lifecycle management and domain creation but does not directly create network segments.

Therefore, the administrator must use NSX Manager to create a new network segment in VMware Cloud Foundation.