Top 20 Software Defined Networking Cloud Interview Questions Answers

Software Defined Networking Definition

Software Defined Networking (SDN) is an architecture that gives networks more programmability and flexibility by separating the control plane from the data plane. The role of software defined networks in cloud computing lets users respond quickly to changes. SDN management makes network configuration more efficient and improves network performance and monitoring.Diagram depicts software defined networking architecture that gives networks more programmability and flexibility by separating the control plane from the data plane in application delivery from application servers to application end users.

What is Software Defined Networking?

Software Defined Networking (SDN) enables directly programmable network control for applications and network services. Software defined network architecture decouples network control and forwarding functions from physical hardware such as routers and switches to create a more manageable and dynamic network infrastructure.

SDN architecture includes the following components:

• SDN Application — Communicates network resources and network devices to the SDN controller through the northbound interface (NBI).

• SDN Controller — Translates the requirements from the SDN application layer to the SDN datapaths. It also provides the SDN applications with a central repository of network policies, a view of the networks and network traffic.

• SDN Datapath — Implements switches that move data packets on a network.

• SDN API — Application program interfaces (APIs) provide both open and proprietary communication between the SDN Controller and the routers of the network.

How to Implement Software Defined Networking?

Implementing software defined networking basics without purpose and planning is not advised.

The following tips will ensure a smooth network management process:

• Define a use case — Be sure there is a real problem for SDN to solve. Focus on that one, clear issue with a use case. This will allow for measurable outcomes and lessons that can be applied elsewhere when fully implementing SDN.

• Create a cross-functional team — Do not implement SDN in silos. A team with a diverse skills is needed for successful implementation. Collaboration is key.

• Test first — Try a non-critical network area for initial SDN implementation before changing the entire network.

• Review — Measure data to see if test outcomes meet goals. Be sure SDN is solving a problem before implementing it across the network.

Q.1 Which plane is known as a subset of control plane?

   A. Management Plane

   B. Control plane

   C. Data Plane

   D. None of the options

Correct Answer : Management Plane

Q.2 Identify the vendors of SDN.

   A. HP

   B. Broacade

   C. Cisco

   D. All the options

Correct Answer : All the options

Q.3 The controller permits the developer in manipulating the flow entries of __.

   A. Single device

   B. Multiple devices

   C. None of the options

Correct Answer : Multiple devices

Q.4 SDN separates the data and control plane.

   A. True

   B. False

Correct Answer : True

Q.5 Is controller hidden by Hardware Abstraction Layer (HAL)?

   A. True



   B. False

Correct Answer : True

Q.6 Infrastructure layer consists of _.

   A. Load balancer

   B. Router

   C. Switch

   D. All the options

Correct Answer : All the options

Q.7 By separating the control plane from the data plane, SDN provides __.

   A. Mobility

   B. Scalability

   C. Flexibility

   D. None of the options

Correct Answer : Scalability

Q.8 At which year,Version 1.0 of the OpenFlow switch specification was released?

   A. September 2007

   B. December 2009

   C. December 2010

   D. None of these

Correct Answer : December 2009

Q.9 Which data format does REST API use?

   A. JSON

   B. XML

   C. Both JSON and XML



   D. None of the options

Correct Answer : Both JSON and XML

Q.10 Which command will you use to retrieve information?

   A. HTTP GET

   B. HTTPS PUT

   C. None of the options

Correct Answer : HTTP GET

Q.11 REST stands for ___.

   A. Representational Signal Transfer

   B. Referenced State transfer

   C. Representational State Transfer

   D. None of the options

Correct Answer : Representational State Transfer

Q.12 Identify a company that offers OF-enabled controllers.

   A. Cisco

   B. Brocade

   C. Both Cisco and Brocade

   D. None of the options

Correct Answer : Cisco

Q.13 Southbound interfaces from the controller communicate with _.

   A. Hardware applications

   B. Software applications

   C. Both hardware and software applications

   D. None of the options

Correct Answer : Both hardware and software applications

Q.14 Identify the southbound interfaces from the following options.

   A. Cisco OpFlex

   B. CLI

   C. Openflow

   D. All the options

Correct Answer : Openflow

Q.15 _ is considered as one of the first software defined networking (SDN) standards.

   A. Openday

   B. Opencontrol

   C. Openflow

   D. None of the options

Correct Answer : Openflow

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