Because SDA is part of the exam objectives. Also the CCNA changed alot in the last couple of years, it's no longer CCNA R&S, it includes stuff from the old CCNA Security, Wireless, etc
VXLAN is a network encapsulation technique used in modern data center environments and Software Defined Networking (SDN) architectures, including SDA. It is designed to enable scalable and flexible network virtualization by encapsulating Layer 2 Ethernet frames in UDP (User Datagram Protocol) packets.
In SDA, VXLAN is employed to create an overlay network that can span across different fabrics and provide connectivity between edge nodes in a scalable and efficient manner. VXLAN helps overcome the limitations of traditional VLAN-based networks and allows for more dynamic and automated provisioning of network services in a software-defined environment.
C is correct
Explanation:
The SD(Cisco® Software-Defined Access)-Access fabric uses the VXLAN data plane to provide transport of the full original Layer 2 frame and additionally uses LISP as the control plane to resolve endpoint-to-location (EID-to-RLOC) mappings. The SD-Access fabric replaces sixteen (16) of the reserved bits in the VXLAN header to transport up to 64,000 SGTs using a modified VXLAN-GPO (sometimes called VXLAN-GBP) format described in https://tools.ietf.org/html/draft-smith-vxlan-group-policy-04.
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