400-007: Cisco Certified Design ExpertDemo

By Cisco · Question Mode

QuestionQ322

Control, Data, Management Plane, and Operational Design

The controller has a global view of the network and can readily ensure that the network remains in a consistent, optimal configuration. Which two statements describe a centralized SDN control path?

Choose two
  • A It significantly improves the latency when performing reactive handling of PACKET_IN events
  • B Integrating smart NIC capabilities on the local host level is made easier through rest APIs
  • C A centralized controller can support all southbound APIs, which allows for easy integration with legacy equipment
  • D It is highly-available by design with no single-point-of-failure risks present
  • E Scaling of the centralized controller cluster is challenging for services like DHCP and load-balancing
Explanation

A centralized SDN controller provides a common control point that can expose and support southbound interfaces for integrating network devices, including legacy equipment. Centralized, stateful services such as DHCP and load balancing can be difficult to scale across a controller cluster. Reactive PACKET_IN processing incurs controller-path latency, and centralized control is not inherently highly available without deliberate redundancy and failover design.

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