Refer to the partial exhibit from an HPE Aruba Networking CX 8325:A new port on...

The ISP connection should be implemented as a routed physical interface , not as an access port attached to a VLAN/SVI. On AOS-CX, the routing command places a physical interface into Layer 3 mode, allowing an IP address to be assigned directly to that interface. HPE Aruba explicitly defines routing as enabling routing support and creating a Layer 3 interface; conversely, no routing makes the interface operate as Layer 2. Aruba Networks

The exhibit also shows interface 1/1/25 as administratively down , so no shutdown is required. HPE Aruba documents no shutdown as the command that enables an interface. Aruba Networks The resulting configuration is therefore:

interface 1/1/25

no shutdown

routing

ip address 10.10.10.2/30

This creates a dedicated point-to-point Layer 3 adjacency toward the ISP router. Because the port is no longer participating as a switched VLAN access interface, it removes unnecessary Layer 2 forwarding and the associated risk of creating a Layer 2 loop. Aruba validated configurations for CX 8325 similarly use no shutdown, routing, and an interface IP address for routed point-to-point links. Aruba Networks

Options A and D retain Layer 2 access-port operation, while B incorrectly uses enable instead of the AOS-CX interface command no shutdown.

Study Guide References: Routed Interfaces; routing; no shutdown; Layer 2 versus Layer 3 Ports; ISP/WAN Point-to-Point Design.