Module 7: Quiz

Question 1

A few of the main reasons that SDN arose are: a diversity of different network equipment using different protocols that made managing the network difficult, and a lack of a central platform to control network equipment.

T/F

Answer 1

TRUE

These reasons highlight the challenges faced in traditional networking environments.

Question 2

With SDNs, the control plane and data plane have independent evolution and development.

T/F

Answer 2

TRUE

This independence allows for more flexible network management and innovation.

Question 3

In the SDN approach, the SDN controller is physically located at each router that is present in a network.

T/F

Answer 3

FALSE

The SDN controller is typically centralized rather than distributed across each router.

Question 4

By separating the control plane and the data plane, controlling the router’s behavior became easier using higher order programs.

T/F

Answer 4

TRUE

This separation simplifies updates and path selection control.

Question 5

In the SDN approach, ISPs or other third parties can take up the responsibility for computing and distributing the router’s forwarding tables. True or False?

T/F

Answer 5

TRUE

This allows for more efficient management of routing information.

Question 6

Having the software implementations for SDNs controllers increasingly open and publicly available makes it hard to control, since any person could modify the software easily.

T/F

Answer 6

False

Question 7

In SDN networks, the SDN controller is responsible for the forwarding of traffic.

T/F

Answer 7

FALSE

The SDN controller manages the network but does not directly forward traffic.

Question 8

The network-control applications are programs that manage the underlying network with the help of the SDN controller.

T/F

Answer 8

TRUE

These applications utilize the SDN controller to optimize network operations.

Question 9

In SDN networks, forwarding rules of traffic still have to be based on IP destination and cannot be based on other metrics, packet header info etc.

T/F

Answer 9

FALSE

SDN allows for more flexible forwarding rules based on various metrics.

Question 10

SDN-controlled switches operate on the: Data plane or Control plane?

Answer 10

Data plane

The data plane is responsible for the actual forwarding of packets.

Question 11

In an SDN Architecture, the northbound interface keeps track of information about the state of the hosts, links, switches and other controlled elements in the network.

T/F

Answer 11

False

Question 12

In SDN networks, the southbound interface is responsible for the communication between SDN controller and the controlled devices.

T/F

Answer 12

TRUE

The southbound interface enables the SDN controller to manage devices in the network.

Question 13

In SDN networks, the controller needs to be implemented over a centralized server.

T/F

Answer 13

False