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CS6250 COMPUTER NETWORKS EXAM 2
ACTUAL EXAM PREP 2026 ALL QUESTIONS
AND CORRECT DETAILED ANSWERS ALREADY
A GRADED WITH EXPERT
FEEDBACK|CURRENTLY TESTING |NEW AND
REVISED
(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) -
ANSWER- 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) -
ANSWER- False
(Lesson 7) With SDNs the control plane and data plane have
independent evolution and development. (T/F) - ANSWER- True
(Lesson 7) In the SDN approach, the SDN controller is physically
located at each router that is present in a network. (T/F) - ANSWER-
False
,2|P a g e
(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) - ANSWER- 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) - ANSWER- 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) - ANSWER- False
(Lesson 7) In SDN networks, the SDN controller is responsible for the
forwarding of traffic. (T/F) - ANSWER- False
(Lesson 7) The network-control applications are programs that manage
the underlying network with the help of the SDN controller. (T/F) -
ANSWER- True
(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) - ANSWER- False
(Lesson 7) SDN-controlled switches operate on the: (Data Plane or
Control Plane?) - ANSWER- Data Plane
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(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) - ANSWER- False
(Lesson 7) In SDN networks, the southbound interface is responsible for
the communication between SDN controller and the controlled devices.
(T/F) - ANSWER- True
(Lesson 7) In SDN networks, the controller needs to be implemented
over a centralized server. (T/F) - ANSWER- False
(Lesson 8) An OpenFlow switch can function as a router. (T/F) -
ANSWER- True
(Lesson 8) Determine which plane executes a network policy. (Data
Plane, Control Plane, Management Plane, or All Planes?) - ANSWER-
Data Plane
(Lesson 8) Determine which type of network can implement load
balancing. (Conventional Networks, Software-defined Networks,
Neither, Both?) - ANSWER- 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?) - ANSWER- Software-defined networks
, 4|P a g e
(Lesson 8) Middleboxes can only be used in conventional networks.
(T/F) - ANSWER- True
(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) -
ANSWER- All of the above
(Lesson 8) The networking operating system (NOS) is a part of the data
plane. (T/F) - ANSWER- False
(Lesson 8) The physical devices in an SDN network have embedded
intelligence and control required to perform forwarding tasks. (T/F) -
ANSWER- False
(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) - ANSWER- False
(Lesson 8) The Southbound interfaces are the separating medium
between the Network-control Applications and the Control plane
functionality. (T/F) - ANSWER- False
(Lesson 8) OpenFlow enables the communication between the control
plane and data plane through event-based messages, flow statistics and
CS6250 COMPUTER NETWORKS EXAM 2
ACTUAL EXAM PREP 2026 ALL QUESTIONS
AND CORRECT DETAILED ANSWERS ALREADY
A GRADED WITH EXPERT
FEEDBACK|CURRENTLY TESTING |NEW AND
REVISED
(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) -
ANSWER- 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) -
ANSWER- False
(Lesson 7) With SDNs the control plane and data plane have
independent evolution and development. (T/F) - ANSWER- True
(Lesson 7) In the SDN approach, the SDN controller is physically
located at each router that is present in a network. (T/F) - ANSWER-
False
,2|P a g e
(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) - ANSWER- 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) - ANSWER- 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) - ANSWER- False
(Lesson 7) In SDN networks, the SDN controller is responsible for the
forwarding of traffic. (T/F) - ANSWER- False
(Lesson 7) The network-control applications are programs that manage
the underlying network with the help of the SDN controller. (T/F) -
ANSWER- True
(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) - ANSWER- False
(Lesson 7) SDN-controlled switches operate on the: (Data Plane or
Control Plane?) - ANSWER- Data Plane
,3|P a g e
(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) - ANSWER- False
(Lesson 7) In SDN networks, the southbound interface is responsible for
the communication between SDN controller and the controlled devices.
(T/F) - ANSWER- True
(Lesson 7) In SDN networks, the controller needs to be implemented
over a centralized server. (T/F) - ANSWER- False
(Lesson 8) An OpenFlow switch can function as a router. (T/F) -
ANSWER- True
(Lesson 8) Determine which plane executes a network policy. (Data
Plane, Control Plane, Management Plane, or All Planes?) - ANSWER-
Data Plane
(Lesson 8) Determine which type of network can implement load
balancing. (Conventional Networks, Software-defined Networks,
Neither, Both?) - ANSWER- 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?) - ANSWER- Software-defined networks
, 4|P a g e
(Lesson 8) Middleboxes can only be used in conventional networks.
(T/F) - ANSWER- True
(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) -
ANSWER- All of the above
(Lesson 8) The networking operating system (NOS) is a part of the data
plane. (T/F) - ANSWER- False
(Lesson 8) The physical devices in an SDN network have embedded
intelligence and control required to perform forwarding tasks. (T/F) -
ANSWER- False
(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) - ANSWER- False
(Lesson 8) The Southbound interfaces are the separating medium
between the Network-control Applications and the Control plane
functionality. (T/F) - ANSWER- False
(Lesson 8) OpenFlow enables the communication between the control
plane and data plane through event-based messages, flow statistics and
