400-007 · Question #246
An enterprise solution team is performing an analysis of multilayer architecture and multicontroller SDN solutions for multisite deployments. The analysis focuses on the ability to run tasks on any…
The correct answer is D. Deploy a root controller to gather a complete network-level view. In a hierarchical multicontroller SDN architecture, a root controller aggregates the full network view and provides a standardized interface to delegate tasks to any subordinate controller.
Question
An enterprise solution team is performing an analysis of multilayer architecture and multicontroller SDN solutions for multisite deployments. The analysis focuses on the ability to run tasks on any controller via a standardized interface. Which requirement addresses this ability on a multicontroller platform?
Options
- ABuild direct physical connectivity between different controllers
- BUse the East-West API to facilitate replication between controllers within a cluster
- CUse OpenFlow to implement and adapt new protocols
- DDeploy a root controller to gather a complete network-level view
How the community answered
(56 responses)- A4% (2)
- B18% (10)
- C9% (5)
- D70% (39)
Why each option
In a hierarchical multicontroller SDN architecture, a root controller aggregates the full network view and provides a standardized interface to delegate tasks to any subordinate controller.
Building direct physical connectivity between controllers is a hardware-layer concern that does not provide the logical abstraction or standardized software interface needed for multicontroller task delegation.
The East-West API enables synchronization and state replication between peer controllers within a single cluster, but does not provide a top-level standardized interface for running tasks across all controllers in a multisite hierarchy.
OpenFlow is a southbound protocol used to program and control the data plane of network forwarding devices, not a mechanism for executing tasks across multiple SDN controllers.
A root controller sits at the top of the SDN controller hierarchy, collecting topology and state information from all child controllers to maintain a complete network-level view. This hierarchical design enables a standardized interface through which tasks can be initiated and executed on any controller within the multisite deployment.
Concept tested: SDN hierarchical multicontroller architecture and root controller role
Source: https://www.cisco.com/c/en/us/solutions/software-defined-networking/overview.html
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