In AOS-CX architecture, management services (such as SSH, HTTPS, and SNMP) are VRF-aware. This is a security hardening feature designed to separate management traffic from data traffic.

Default Behavior: By default, AOS-CX switches enable the HTTPS server only on the mgmt VRF (the Out-of-Band Management port). This means the Web UI and REST API are only accessible through the dedicated physical management port.

In-Band Management: When you create an SVI (Switch Virtual Interface) like SVI 100, that interface resides in the default VRF (unless you manually assign it to a custom VRF). To manage the switch " in-band " through this SVI using a web browser, you must explicitly instruct the AOS-CX operating system to listen for HTTPS requests on that specific VRF.

The Command: The command https-server vrf default tells the switch to start the web server process for the default VRF. Without this command, any attempt to access the switch ' s IP address on SVI 100 via port 443 will be dropped by the switch ' s internal control plane protection, as the service is not active for that network context.

Verification of Options:

Option A: This command is typically already part of the factory default configuration to allow OOBM access; it does nothing for an SVI in the default VRF.

Option B: Incorrect, as HTTPS is restricted to the mgmt VRF out of the box for security.

Option C: This is a true statement regarding the default state, but it describes the problem rather than providing the solution to the requirement.

Option D: This is the correct administrative action to enable the service for the data plane (where SVI 100 lives).