Software-Defined Networking (SDN) Quiz

What does SDN fundamentally separate in a network?

• The OSI model layers

• The application layer and infrastructure layer

• The control plane and data plane

• The physical switches and virtual routers

Answer explanation

SDN (Software-Defined Networking) fundamentally separates the control plane, which makes decisions about traffic, from the data plane, which forwards traffic. This separation allows for more flexible and efficient network management.

Which layer in SDN defines network behavior and policies?

• Application Layer

• Control Layer

• Data Plane

• Infrastructure Layer

Answer explanation

The Application Layer in SDN is responsible for defining network behavior and policies, allowing applications to interact with the network and manage resources effectively.

What is the primary function of the SDN controller?

• To define network behavior and policies

• To operate at Layer 4 of the OSI model

• To forward packets at wire speed

• To interpret policies and centralize decision-making

Answer explanation

The primary function of the SDN controller is to interpret policies and centralize decision-making, allowing for dynamic network management and control, rather than just defining behavior or forwarding packets.

Which tool is an example of the SDN control layer?

• Open vSwitch

• Firewall

• OpenDaylight

• Load balancer

Answer explanation

OpenDaylight is an SDN controller that manages network resources and policies, making it a key example of the SDN control layer. In contrast, Open vSwitch, firewalls, and load balancers serve different roles in network management.

What protocol is commonly used between the SDN controller and network devices?

• OpenFlow

• SMTP

• HTTP

• FTP

Answer explanation

OpenFlow is the primary protocol used in Software-Defined Networking (SDN) for communication between the SDN controller and network devices, enabling centralized control and management of the network.

How does SDN improve video streaming during a live event?

• By detecting congestion and rerouting traffic automatically

• By manually reconfiguring switches

• By reducing the number of virtual paths

• By disabling QoS rules

Answer explanation

SDN improves video streaming by detecting congestion in real-time and automatically rerouting traffic. This dynamic adjustment helps maintain a smooth streaming experience during live events, unlike manual reconfiguration or disabling QoS.

Which of the following is a benefit of SDN?

• Centralized control

• Limited programmability

• Increased manual configuration

• Reduced scalability

Answer explanation

Centralized control is a key benefit of Software-Defined Networking (SDN), allowing for easier management and configuration of the network from a single point, unlike the other options which imply limitations.

What does SDN add above physical devices?

• A software overlay

• A hardware layer

• A virtual router

• A physical switch

Answer explanation

SDN (Software-Defined Networking) introduces a software overlay that abstracts and manages the underlying physical devices, enabling more flexible and programmable network management compared to just relying on hardware.

Which SDN protocol is used for configuration and monitoring?

• OpenFlow

• DNS

• NETCONF / RESTCONF

• HTTP

Answer explanation

NETCONF and RESTCONF are protocols specifically designed for network device configuration and monitoring, making them the correct choice for this question. OpenFlow is primarily for data plane control, while DNS and HTTP serve different purposes.

What is the primary focus of the infrastructure layer in SDN?

• Forwarding packets

• Defining policies

• Creating APIs

• Interpreting policies

Answer explanation

The primary focus of the infrastructure layer in SDN is forwarding packets. This layer is responsible for the actual data transfer between devices, ensuring efficient communication across the network.