CS 6250 Exam 2 - Quiz 8 Questions with
Complete Solutions
(T/F) An OpenFlow switch can function as a router. - ANSWERS True (By using
SDN architecture we can implement functionalities + functions we want our
control devices to have)
Determine which plane executes a network policy: Data, Management, or Control
- ANSWERS Data plane (has control devices like switch or middle box that
performs some operation)
Determine which type of network can implement load balancing: conventional or
software-defined networks - ANSWERS BOTH
Determine which type of network decouples the control and data planes:
conventional or software-defined networks - ANSWERS SDN
(T/F) Middleboxes can only be used in conventional networks - ANSWERS False
(used in both conventional networks and SDN's)
Determine which of the following can be implemented as a network application in
software-defined networking.
· Routing
· Security enforcement
· Quality of Service (QoS) enforcement - ANSWERS - Routing
, - Security Enforcement
- QoS enforcement
(T/F) The networking operating system (NOS) is a part of the data plane -
ANSWERS False (NOS is part of the CONTROL plane)
(T/F) The physical devices in an SDN network have embedded intelligence and
control required to perform forwarding tasks - ANSWERS False (SDN
applications produces such intelligence, it is NOT embedded + through SDN stack
it will lead to control)
(T/F) 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 - ANSWERS False
(can define the action depending on flows + rules + non-matches, they're not
always dropped)
(T/F) The Southbound interfaces are the separating medium between the
Network-control Applications and the Control plane functionality - ANSWERS
False (that's Northbound, Southbound separates control plane + data plane
functionality)
(T/F) 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 - ANSWERS True
(T/F) One of the disadvantages of an SDN centralized controller architecture is that
it can introduce a single point of failure and also scaling issues - ANSWERS
True (for any centralized architecture)
Complete Solutions
(T/F) An OpenFlow switch can function as a router. - ANSWERS True (By using
SDN architecture we can implement functionalities + functions we want our
control devices to have)
Determine which plane executes a network policy: Data, Management, or Control
- ANSWERS Data plane (has control devices like switch or middle box that
performs some operation)
Determine which type of network can implement load balancing: conventional or
software-defined networks - ANSWERS BOTH
Determine which type of network decouples the control and data planes:
conventional or software-defined networks - ANSWERS SDN
(T/F) Middleboxes can only be used in conventional networks - ANSWERS False
(used in both conventional networks and SDN's)
Determine which of the following can be implemented as a network application in
software-defined networking.
· Routing
· Security enforcement
· Quality of Service (QoS) enforcement - ANSWERS - Routing
, - Security Enforcement
- QoS enforcement
(T/F) The networking operating system (NOS) is a part of the data plane -
ANSWERS False (NOS is part of the CONTROL plane)
(T/F) The physical devices in an SDN network have embedded intelligence and
control required to perform forwarding tasks - ANSWERS False (SDN
applications produces such intelligence, it is NOT embedded + through SDN stack
it will lead to control)
(T/F) 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 - ANSWERS False
(can define the action depending on flows + rules + non-matches, they're not
always dropped)
(T/F) The Southbound interfaces are the separating medium between the
Network-control Applications and the Control plane functionality - ANSWERS
False (that's Northbound, Southbound separates control plane + data plane
functionality)
(T/F) 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 - ANSWERS True
(T/F) One of the disadvantages of an SDN centralized controller architecture is that
it can introduce a single point of failure and also scaling issues - ANSWERS
True (for any centralized architecture)
