CS6250 Computer Networks Actual Exam Newest Complete Questions And
Correct Detailed 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)
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)
False
(Lesson 7) With SDNs the control plane and data plane have independent
evolution and development. (T/F)
True
(Lesson 7) In the SDN approach, the SDN controller is physically located at each
router that is present in a network. (T/F)
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)
True
1
,(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)
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)
False
(Lesson 7) In SDN networks, the SDN controller is responsible for the forwarding
of traffic. (T/F)
False
(Lesson 7) The network-control applications are programs that manage the
underlying network with the help of the SDN controller. (T/F)
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)
False
(Lesson 7) SDN-controlled switches operate on the: (Data Plane or Control Plane?)
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)
2
, False
(Lesson 7) In SDN networks, the southbound interface is responsible for the
communication between SDN controller and the controlled devices. (T/F)
True
(Lesson 7) In SDN networks, the controller needs to be implemented over a
centralized server. (T/F)
False
(Lesson 8) An OpenFlow switch can function as a router. (T/F)
True
(Lesson 8) Determine which plane executes a network policy. (Data Plane, Control
Plane, Management Plane, or All Planes?)
Data Plane
(Lesson 8) Determine which type of network can implement load balancing.
(Conventional Networks, Software-defined Networks, Neither, Both?)
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?)
Software-defined networks
(Lesson 8) Middleboxes can only be used in conventional networks. (T/F)
True
3
Correct Detailed 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)
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)
False
(Lesson 7) With SDNs the control plane and data plane have independent
evolution and development. (T/F)
True
(Lesson 7) In the SDN approach, the SDN controller is physically located at each
router that is present in a network. (T/F)
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)
True
1
,(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)
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)
False
(Lesson 7) In SDN networks, the SDN controller is responsible for the forwarding
of traffic. (T/F)
False
(Lesson 7) The network-control applications are programs that manage the
underlying network with the help of the SDN controller. (T/F)
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)
False
(Lesson 7) SDN-controlled switches operate on the: (Data Plane or Control Plane?)
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)
2
, False
(Lesson 7) In SDN networks, the southbound interface is responsible for the
communication between SDN controller and the controlled devices. (T/F)
True
(Lesson 7) In SDN networks, the controller needs to be implemented over a
centralized server. (T/F)
False
(Lesson 8) An OpenFlow switch can function as a router. (T/F)
True
(Lesson 8) Determine which plane executes a network policy. (Data Plane, Control
Plane, Management Plane, or All Planes?)
Data Plane
(Lesson 8) Determine which type of network can implement load balancing.
(Conventional Networks, Software-defined Networks, Neither, Both?)
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?)
Software-defined networks
(Lesson 8) Middleboxes can only be used in conventional networks. (T/F)
True
3
