Refer to the exhibit. An engineer builds a data center network design using EVPN technology. Within the design, the fabric acts as a gateway. Traffic from host X to host Y must pass through the Cisco

"VRF sandwich" is an architectural pattern for inserting a firewall between VRFs, but it describes an architectural approach rather than a firewall deployment mode.

In an EVPN fabric where the fabric acts as a gateway and deep packet inspection is required between hosts, deploying the Cisco ASA firewall in routed mode is necessary. In routed mode, the firewall acts as a Layer 3 device, performing routing functions between its interfaces, allowing it to inspect traffic as it traverses from one network segment to another, fulfilling the requirement for deep packet inspection and increased security.

"Service graph" is a concept used in SDN platforms to define and automate service insertion, but it is not a firewall deployment mode.

"VLAN stitching" is a technique used in some network designs to connect VLANs, but it's not a firewall deployment mode and does not inherently provide deep packet inspection between routed segments.