CS6250 Computer Networks Exam 2 – Questions & Correct Answers
(Lesson 7) A few of the main reasons that SDN arose are: a diversity of
different network equipment (eg routers, switches, firewalls, etc.) using different protocols that made managing the network difficult, and second a lack of a central platform to control network equipment. (T/F) Correct Ans - True (Lesson 7) The main idea behind SDNs is to divide tasks into smaller functions so the code is more modular and easy to manage. (T/F) Correct Ans - False (Lesson 7) With SDNs the control plane and data plane have independent evolution and development. (T/F) Correct Ans - True (Lesson 7) In the SDN approach, the SDN controller is physically located at each router that is present in a network. (T/F) Correct Ans - False (Lesson 7) By separating the control plane and the data plane, controlling the router's behavior became easier using higher order programs. For example, it is easier to update the router's state or control the path selection. (T/F) Correct Ans - True (Lesson 7) In the SDN approach, ISPs or other third parties can take up the responsibility for computing and distributing the router's forwarding tables.(T/F) Correct Ans - True (Lesson 7) 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) Correct Ans - False (Lesson 7) In SDN networks, the SDN controller is responsible for the forwarding of traffic. (T/F) Correct Ans - False (Lesson 7) The network-control applications are programs that manage the underlying network with the help of the SDN controller. (T/F) Correct Ans
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(Lesson 7) 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) Correct Ans - False
(Lesson 7) SDN-controlled switches operate on the: (Data Plane or Control
Plane?) Correct Ans - Data Plane (Lesson 7) 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, as well as copies of the flow tables of the switches.(T/F) Correct Ans - False (Lesson 7) In SDN networks, the southbound interface is responsible for the communication between SDN controller and the controlled devices. (T/F) Correct Ans - True (Lesson 7) In SDN networks, the controller needs to be implemented over a centralized server. (T/F) Correct Ans - False (Lesson 8) An OpenFlow switch can function as a router. (T/F) Correct Ans - True (Lesson 8) Determine which plane executes a network policy. (Data Plane, Control Plane, Management Plane, or All Planes?) Correct Ans - Data Plane (Lesson 8) Determine which type of network can implement load balancing.(Conventional Networks, Software-defined Networks, Neither, Both?) Correct Ans - Both conventional and software-defined networks (Lesson 8) Determine which type of network decouples the control and data planes. (Conventional Networks, Software-defined Networks, Neither, Both?) Correct Ans - Software-defined networks (Lesson 8) Middleboxes can only be used in conventional networks. (T/F) Correct Ans - True
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