6.3 Describe Controller-Based, Software Defined Architecture (overlay, Underlay, and Fabric) 200-301 Practice Questions (Page 2)

Questions 6–10

1. 6expert · hard

   A network architect is evaluating SDN controllers for a mission-critical network. The architect is concerned about the risk of a single controller becoming a bottleneck or a point of failure. Which controller deployment model best addresses this concern?

   • ADeploy the controller on a virtual machine with automatic restart.
   • BUse a controller that only manages the underlay, not the overlay.
   • CDeploy a cluster of controllers with active-active or active-standby redundancy.
   • DUse a single controller with a large CPU and memory.
   Reveal Solution Discussion Select an answer first
2. 7expert · hard

   A network engineer is deploying an SDN controller that uses NETCONF as the southbound API. The engineer needs to ensure that the controller can manage devices from multiple vendors. Which consideration is most important?

   • AAll devices must use the same NETCONF version.
   • BThe controller must use a proprietary southbound API for each vendor.
   • CAll devices must support the same YANG models.
   • DThe controller must support vendor-specific YANG models and data models.
   Reveal Solution Discussion Select an answer first
4. 8application · medium

   A company is migrating to a controller-based architecture to simplify network management. The current network uses distributed routing protocols. Which benefit is most directly achieved by separating the control plane from the data plane?

   • AAutomatic replacement of all legacy switches with SDN-capable hardware.
   • BGuaranteed increase in data-plane throughput on every switch.
   • CCentralized policy enforcement and consistent forwarding decisions across the network.
   • DElimination of all routing protocols from the network.
   Reveal Solution Discussion Select an answer first
5. 9foundation · easy

   In a controller-based architecture, what is the role of the underlay network?

   • AIt is the set of policies that define which applications can communicate with each other.
   • BIt provides the logical, virtual network that carries application traffic between endpoints.
   • CIt is the management network used to access network devices for configuration.
   • DIt is the physical network of switches, routers, and links that provides connectivity for the overlay.
   Reveal Solution Discussion Select an answer first
6. 10foundation · easy

   In a software-defined architecture, what is the primary purpose of a northbound API?

   • ATo provide a secure tunnel for data traffic between sites.
   • BTo allow the controller to configure and monitor network devices.
   • CTo allow network devices to exchange routing information with each other.
   • DTo allow applications to communicate with the controller to request network services.
   Reveal Solution Discussion Select an answer first