Exam CISSP topic 1 question 313 discussion

Correct answer seems to be A

In Software Defined Networking (SDN), the Northbound Interfaces are responsible for translating network requirements from the SDN applications to the SDN controller. These interfaces provide the necessary abstraction for applications to communicate their network needs without having to deal with the underlying network details. The SDN controller then interprets these requirements and configures the network accordingly through the Southbound Interfaces

I work with SDN... This is a terribly worded question. I would go with A though. controller im guessing they mean the control plane which is repsonsible for relaying routing information.

I will say I dont know alooot about SDN, but I am pretty sure the northbound/southbound or ANY API is just a mechanism for passing data back and forth and its not able to make any logical decisions. So while the Northbound would be possibly translating the data into a form the controller can use, its still the controler that will make the network decisions

SDN Controller. Those who have worked with SDN will know the northbound is the management plane which is the GUI portal for users to key in the desired outcome. The management plane push those input to SDN Controller to convert it into IP address, QoS routing etc. SDN controllers provide an API (Application Programming Interface), also known as a northbound interface, through which external applications or systems such as orchestration platforms can interact with the network. In such cases, an SDN controller translates the application’s layer requirements (e.g. high-level description of the network configuration) into a configuration specific to the supported network elements.

Answer C) The application layer transmits data about desired network behavior and required resources to the Controller...The Northbound Interface relays data between the controller component, the application component, and the policy layer. This component typically provides an abstract view of the network and enables the direct expression of network requirements and behavior, regardless of latitude (abstraction) and longitude (functionality). https://www.spiceworks.com/tech/networking/articles/what-is-sdn/

A. SDN Controller The SDN Controller is primarily responsible for translating network requirements in the SDN architecture. It acts as the central orchestrator that receives instructions and requirements from SDN applications and communicates with the networking components to configure the network based on those requirements. The SDN Northbound Interfaces facilitate communication between the applications and the SDN Controller but do not directly handle the translation of network requirements.

The answer is C: The northbound APIs and interfaces translate requirements from SDN applications to instructions the controller understands. They provide an abstraction layer between apps and the controller. The SDN controller handles policies and oversees the network. The datapath forwards traffic under the controller's management. SDN applications define network needs. So the northbound APIs serve the key role of taking intents from SDN apps and converting those into the control logic that the SDN controller can implement on the underlying network infrastructure. This makes option C the correct component that handles requirement translation. -Claude 2.0

C. SDN Northbound Interfaces In a Software Defined Networking (SDN) architecture: The SDN Controller is the central unit that manages and oversees the network, making decisions about the flow of network traffic. The SDN Datapath includes the network devices, like switches, that forward traffic based on the rules provided by the SDN Controller. The SDN Northbound Interfaces allow the SDN Controller to communicate with higher-level applications. These interfaces are responsible for translating the network requirements from these applications into commands that the SDN Controller can understand and implement. The SDN Application is a higher-level application that defines network behavior and requirements. Given the options, the component responsible for translating network requirements is the SDN Northbound Interfaces.

In a Software Defined Networking (SDN) architecture, the Northbound Interfaces are responsible for translating network requirements. They provide an interface between the SDN controller and the business applications or orchestration systems. The northbound interface essentially allows for programmability of the network by providing an API for applications to tell the SDN controller what they need from the network. The controller then instructs the network devices on how to handle traffic to meet these needs. For clarity: The SDN Controller is the centralised unit that manages the network, making high-level decisions about traffic flows across the network. The SDN Datapath includes the network devices (like switches) that forward traffic based on instructions from the controller. The SDN Application layer consists of applications that use the network, like user applications or system applications, which communicate their needs to the controller via the northbound interfaces. - GPT 4

The correct answer is C. SDN Northbound Interfaces. Explanation: In a software-defined networking (SDN) architecture, the Northbound Interfaces are responsible for translating network requirements from SDN applications to the SDN controller. Northbound Interfaces act as a communication bridge between the applications that consume the network services and the SDN controller that manages the network devices. These interfaces typically use RESTful APIs, which allow the applications to request specific network configurations or gather network information from the controller. Incorrect answers: A. SDN Controller: The SDN controller is the central component of an SDN architecture. It is responsible for managing the network devices and orchestrating the overall network behavior. However, it does not directly translate network requirements.

A. SDN Controller.

Answer from here:https://learnizoglobal.com/blog/2021/09/software-defined-networking-sdn-architecture-and-components-of-sdn/#:~:text=The%20SDN%20Controller%20is%20a%20logical%20entity%20that,and%20communicating%20it%20back%20to%20the%20SDN%20applications. SDN Controller The SDN Controller is a logical entity that receives instructions or requirements from the SDN application layer and relays them to the networking components. The controller is also responsible for extracting information about the network from the hardware devices and communicating it back to the SDN applications. Using the southbound API, the controller can add, update, and delete flow entries, both reactively and proactively. The SDN controller represents the SDN control plane and has complete control of the data plane.

From the first page of Google on Wikipedia. The SDN Controller is a logically centralized entity in charge of (i) translating the requirements from the SDN Application layer down to the SDN Datapaths and (ii) providing the SDN Applications with an abstract view of the network (which may include statistics and events). "A" it is.