ITSY Ch 9.3 Software-Defined Networking

Which of the following BEST describes the Physical SDN layer?

Also known as the Infrastructure layer. The Physical layer is also known as the Infrastructure layer. The Application layer is sometimes called a northbound API. The Control layer receives its requests from the Application layer. One of the advantages of SDN is it gives new life to old networking hardware.

Software-defined networking (SDN)

An architecture that allows network and security professionals to manage, control, and make changes to a network. Software defined networking (SDN) is a recent technology that allows network and security professionals to manage, control, and make changes to a network. The idea is that network engineers are 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 uses a controller to manage the devices. The controller is software that is able to inventory hardware components in the network, gather network statistics, make routing decisions based 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 SDN layer would a load balancer that stops and starts VMs as resource use increases reside on?

Application Applications reside on the Application layer. A load balancer that stops and starts VMs as resource use increases is an example of an application that would reside on this layer. The Physical layer is where both physical and virtual network devices sit. The Session layer is the fifth layer of the OSI model. The Control layer is the middle layer. This is where the controller resides.

Three Layers of SDN

Application layer - The Application layer communicates with the Control layer through what is called the northbound interface. These are sometimes called northbound APIs. Control layer - The Control layer receives its requests from the Application layer and then provides the Physical layer with its configuration and instructions. Physical layer - The 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.

Which of the following BEST describes the Application SDN layer?

Communicates with the Control layer through the northbound interface. The Application layer communicates with the Control layer through what is called the northbound interface. These are sometimes called northbound APIs. The Physical layer, also known as the Infrastructure layer, communicates with the Control layer through the southbound interface. The Control layer receives its requests from the Application layer and then provides the Physical layer with its configuration and instructions. The controller is software that is able to inventory hardware components in the network.

Which of the following is an advantage of software-defined networking (SDN)?

More granular control One of the advantages of SDN is more granular control. Some disadvantages of SDN include: Is currently a new technology Lack of vendor support Standards are still being developed

Which of the following does the Application layer use to communicate with the Control layer?

Northbound APIs The Application layer communicates with the Control layer through what is called the northbound interface. These are sometimes called northbound APIs. The controller is just a software platform that contains other applications. It can be thought of as the network's operating system.

Which of the following is a disadvantage of software defined networking (SDN)?

SDN standards are still being developed. Some of the disadvantages of SDN include: Still a newer technology Lack of vendor support Standards are still being developed Centralized control opens a new target for security threats Some of the advantages of SDN include: Centralized management More granular control Lower overall cost and labor Gives new life to old networking hardware Gathers network information and statistics Facilitates communication between hardware from different vendors

Network engineers have the option of using software to configure and control the network rather than relying on 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 (SDN) Software-defined networking (SDN) is a relatively new technology that allows network and security professionals to manage, control, and make changes to a network. Network engineers are able to use software to configure and control the network rather than relying on individual static configuration files that are located on each network device. The Control layer is one of three layers that comprise software defined networking. The other layers are the Application layer and the Physical layer. Load balancers can be a component of the Application layer. The Physical layer can also be referred to as the Infrastructure layer.

SDN Advantages and Disadvantages

Some advantages of SDN include: Centralized management More granular control Lower overall cost and labor Give new life to old networking hardware Gather network information and statistics Facilitate communication between hardware from different vendors Some disadvantages of SDN include: Is currently a new technology Lack of vendor support Standards are still being developed Centralized control opens a new target for security threats

Which APIs do individual networking devices use to communicate with the control plane from the Physical layer?

Southbound Individual networking devices on the Physical layer use southbound APIs to communicate with the control plane and vice versa. The Application layer communicates with the Control layer through what is called the northbound interface.

Software defined networking (SDN) uses a controller to manage devices. The controller is able to inventory hardware components on the network, gather network statistics, make routing decisions based on gathered data, and facilitate communication between devices from different vendors. It can also be used to make widespread configuration changes on just one device. Which of the following best describes an SDN controller?

The SDN controller is software. SDN uses a controller to manage devices. The controller is software that is able to inventory hardware components on the network, gather network statistics, make routing decisions based on gathered data, and facilitate communication between devices from different vendors. The controller can also be used to make widespread configuration changes on just one device.

Drag the software defined networking (SDN) layer on the left to the appropriate function on the right. (Each SDN layer may be used once, more than once, or not at all.)

This layer receives its requests from the Application layer - Control layer This layer is also known as the Infrastructure layer. - Physical layer This layer communicates with the Control layer through what is called the northbound interface. - Application layer This layer provides the Physical layer with configuration and instructions. - Control layer On this layer, individual networking devices use southbound APIs to communicate with the control plane. - Physical layer The SDN architecture consists of three layers: Application layer - communicates with the Control layer through the northbound interface. These are sometimes called northbound APIs. Control layer - receives its requests from the Application layer and then provides the Physical layer with its configuration and instructions. Physical layer - communicates with 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 is called the Physical layer, it is where both physical and virtual network devices sit. It is also known as the Infrastructure layer.