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Whatis a challenge of having an SD-Access Centralized design where a single fabric encompasses the main site and all branch sites across the WAN?
Correct Answer: D
Explanation A centralized SD-Access design is where a single fabric domain spans across the main site and all branch sites over the WAN. This design has some challenges, such as: Since the traffic is encapsulated in VXLAN headers, SD-WAN features such as application-aware routing, QoS, and security policies cannot be applied to the traffic based on the original IP headers. This means that the SD-WAN controller cannot optimize or route the traffic based on the application or user identity. The traffic is treated as a single class of service across the WAN. The centralized design also introduces a single point of failure and a potential bottleneck at the main site, where the border nodes and the control plane nodes are located. If the main site goes down or the WAN link fails, the branch sites will lose connectivity to the fabric domain and the external networks. The centralized design also requires a high bandwidth and low latency WAN connection between the main site and the branch sites, which may not be feasible or cost-effective for some scenarios. References := Some possible references are: Cisco Enterprise Networks SDA, SDWAN and ISE Exam for System Engineers (ENSDENG) Study Guide Cisco SD-Access and SD-WAN Integration Design Guide
