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CS6250 Computer Network EXAM 2 review Questions and Answers
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CS6250 Computer Network EXAM 2 review Questions and Answers
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CS6250 Computer Network EXAM 2 review Questionsand Answers
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) - ANSWERTrue
The main idea behind SDNs is to divide tasks into smaller functions so the code is more
modular and easy to manage. (T/F) - ANSWERFalse
With SDNs the control plane and data plane have independent evolution and
development. (T/F) - ANSWERTrue
In the SDN approach, the SDN controller is physically located at each router that is
present in a network. (T/F) - ANSWERFalse
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) - ANSWERTrue
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) - ANSWERTrue
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) - ANSWERFalse
In SDN networks, the SDN controller is responsible for the forwarding of traffic. (T/F) -
ANSWERFalse
The network-control applications are programs that manage the underlying network with
the help of the SDN controller. (T/F) - ANSWERTrue
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) - ANSWERFalse
SDN-controlled switches operate on the: (Data Plane or Control Plane?) -
ANSWERData Plane
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) - ANSWERFalse
, In SDN networks, the southbound interface is responsible for the communication
between SDN controller and the controlled devices. (T/F) - ANSWERTrue
In SDN networks, the controller needs to be implemented over a centralized server.
(T/F) - ANSWERFalse
(Lesson 8) An OpenFlow switch can function as a router. (T/F) - ANSWERTrue
(Lesson 8) Determine which plane executes a network policy. (Data Plane, Control
Plane, Management Plane, or All Planes?) - ANSWERData Plane
(Lesson 8) Determine which type of network can implement load balancing.
(Conventional Networks, Software-defined Networks, Neither, Both?) - ANSWERBoth
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?) -
ANSWERSoftware-defined networks
(Lesson 8) Middleboxes can only be used in conventional networks. (T/F) -
ANSWERTrue
(Lesson 8) Determine which of the following can be implemented as a network
application in software-defined networking. (Routing, Security enforcement, Quality of
service (QOS) enforcement, All of the above) - ANSWERAll of the above
(Lesson 8) The networking operating system (NOS) is a part of the data plane. (T/F) -
ANSWERFalse
(Lesson 8) The physical devices in an SDN network have embedded intelligence and
control required to perform forwarding tasks. (T/F) - ANSWERFalse
(Lesson 8) When a packet arrives in an OpenFlow device and it does not match any of
the rules in one of the tables, that packet is always dropped. (T/F) - ANSWERFalse
(Lesson 8) The Southbound interfaces are the separating medium between the
Network-control Applications and the Control plane functionality. (T/F) - ANSWERFalse
(Lesson 8) OpenFlow enables the communication between the control plane and data
plane through event-based messages, flow statistics and packet messages that are
sent from forwarding devices to controller. (T/F) - ANSWERTrue
(Lesson 8) One of the disadvantages of an SDN centralized controller architecture is
that it can introduce a single point of failure and also scaling issues. (T/F) -
ANSWERTrue
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