CS6250 Computer Networks Exam 2
| 100% Correctly Answered and
Graded A+ | 2025/2026 Guide
In SDN networks, the SDN controller is responsible for the forwarding of
traffic. (T/F)
- Correct Answer - False
The network-control applications are programs that manage the
underlying network with the help of the SDN controller. (T/F)
- Correct Answer - True
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 Answer - False
SDN-controlled switches operate on the: (Data Plane or Control Plane?)
- Correct Answer - Data 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) - Correct Answer - False
,In SDN networks, the southbound interface is responsible for the
communication between SDN controller and the controlled devices. (T/F)
- Correct Answer - True
In SDN networks, the controller needs to be implemented over a
centralized server. (T/F) - Correct Answer - False
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 Answer -
True
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 Answer -
False
With SDNs the control plane and data plane have independent
evolution and development. (T/F) - Correct Answer - True
In the SDN approach, the SDN controller is physically located at each
router that is present in a network. (T/F) - Correct Answer - False
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 Answer - True
, 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 Answer - True
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 Answer - False
An OpenFlow switch can function as a router. (T/F) - Correct Answer -
True
Determine which plane executes a network policy. (Data Plane, Control
Plane, Management Plane, or All Planes?) - Correct Answer - Data
Plane
Determine which type of network can implement load balancing.
(Conventional Networks, Software-defined Networks, Neither, Both?) -
Correct Answer - Both conventional and software-defined networks
Determine which type of network decouples the control and data planes.
(Conventional Networks, Software-defined Networks, Neither, Both?) -
Correct Answer - Software-defined networks
Middleboxes can only be used in conventional networks. (T/F) - Correct
Answer - True
Determine which of the following can be implemented as a network
application in software-defined networking. (Routing, Security
| 100% Correctly Answered and
Graded A+ | 2025/2026 Guide
In SDN networks, the SDN controller is responsible for the forwarding of
traffic. (T/F)
- Correct Answer - False
The network-control applications are programs that manage the
underlying network with the help of the SDN controller. (T/F)
- Correct Answer - True
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 Answer - False
SDN-controlled switches operate on the: (Data Plane or Control Plane?)
- Correct Answer - Data 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) - Correct Answer - False
,In SDN networks, the southbound interface is responsible for the
communication between SDN controller and the controlled devices. (T/F)
- Correct Answer - True
In SDN networks, the controller needs to be implemented over a
centralized server. (T/F) - Correct Answer - False
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 Answer -
True
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 Answer -
False
With SDNs the control plane and data plane have independent
evolution and development. (T/F) - Correct Answer - True
In the SDN approach, the SDN controller is physically located at each
router that is present in a network. (T/F) - Correct Answer - False
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 Answer - True
, 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 Answer - True
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 Answer - False
An OpenFlow switch can function as a router. (T/F) - Correct Answer -
True
Determine which plane executes a network policy. (Data Plane, Control
Plane, Management Plane, or All Planes?) - Correct Answer - Data
Plane
Determine which type of network can implement load balancing.
(Conventional Networks, Software-defined Networks, Neither, Both?) -
Correct Answer - Both conventional and software-defined networks
Determine which type of network decouples the control and data planes.
(Conventional Networks, Software-defined Networks, Neither, Both?) -
Correct Answer - Software-defined networks
Middleboxes can only be used in conventional networks. (T/F) - Correct
Answer - True
Determine which of the following can be implemented as a network
application in software-defined networking. (Routing, Security
