6.15 Software-Defined Network (SDN)
Physical layer
Also known as the infrastructure layer
Physical layer
Also known as the infrastructure layer, communicates to the control layer through the southbound interface. The individual networking devices use southbound APIs to communicate with the control plane and vice versa. Even though this layer is called the physical layer, it is where both physical and virtual network devices sit.
Software Defined Networking (SDN)
An interface that allows network and security professionals to manage, control, and make changes to a network.
Application Layer
Communicates with the control layer through what is called the northbound interference. These are sometimes called northbound APIs.
Application layer
Communicates with the control layer through what's called the northbound interface.
Physical layer
Individual networking devices use southbound APIs to communicate with the control plane.
Control layer
Provides the physical layer with configuration and instructions
Control layer
Receives its requests from the application layer
Control layer
Receives its requests from the application layer and then provides the physical layer with its configuration and instructions.
Which of the following is a disadvantage of software-defined networking (SDN)?
SDN standards are still being developed
Network engineers have the option of using software to configure and intelligently control the network rather than relying on the individual static configuration files that are located on each network device. Which of the following is a relatively new technology that allows network and security professionals to use software to manage, control, and make changes to a network?
Software-defined networking
Software-defined networking (SDN) uses a controller to manage the devices. The controller is able to inventory hardware components in the network, gather network statistics, make routing decisions bases on gathered data, and facilitate communication between devices from different vendors. It can also be used to make wide-spread configuration changes on just one device. Which of the following best describes an SDN controller?
The SDN controller is software
You have opted to use software-defined networking (SDN) to manage, control, and make changes to your network. You want to be able to use software to configure and intelligently control the network, rather than relying on the individual static configuration files that are located on each network device. SDN consists of three layers: *Application layer *Control layer *Physical layer Which of the following describes what the SDN control layer does to networking devices that compromise the physical layer?
The control layer removes the control from networking devices and creates a single control plane.
