What's the difference between "creates the IP routing table" and "makes a routing decision"? If you make a routing decision, it's because you previously reviewed the information in the IP routing table. So, I think A and C are correct, but in this case, A is only slightly more correct than C. Also, if C were correct, then A is incorrect? Who creates the IP routing table?
In an SDN architecture, the function that is centralized on the controller is:
A. Creates the IP routing table
This is correct because:
In SDN, the control plane is separated from the data plane and centralized in the SDN controller. The control plane is responsible for making decisions about where traffic should be sent, which includes creating and maintaining routing tables.
The SDN controller acts as the "brain" of the network, maintaining a global view of the network topology and making centralized decisions about routing and forwarding.
One of the key functions of the SDN controller is to calculate and distribute routing information to the network devices (switches and routers) in the data plane. This includes creating and updating IP routing tables.
By centralizing this function, SDN allows for more efficient and dynamic routing decisions based on real-time network conditions and policies.
Im going with C
In traditional networking, routing decisions are typically made by individual network nodes (routers) based on locally stored routing tables.
However, in SDN, the control plane functionality, including routing decisions, is centralized on a controller. The controller determines the routing paths and policies for network traffic flow based on global network conditions and policies, then communicates these decisions to the data plane devices for forwarding.
Why not A?
While in traditional networking, individual network nodes (routers) create and maintain their own IP routing tables based on routing protocols and configurations, in an SDN architecture, this function is centralized on a controller.
The controller, rather than individual nodes, determines the routing paths and policies for network traffic flow.
Therefore, the correct answer is not A, but C.
760
What is the function of the controller in a software-defined network?
A. forwarding packets
B. multicast replication at the hardware level
C. making routing decisions
D. fragmenting and reassembling packets
Answer C best choice
792
Which network plane is centralized and manages routing decisions?
A. management plane
B. data plane
C. policy plane
D. control plane
Control plane is centralized while data plane is distributed
789
What is the function of the controller in a software-defined network?
A. forwarding packets
B. multicast replication at the hardware level
C. setting packet-handling policies
D. fragmenting and reassembling packets
After researches, i found that C is more correct.
Why? Well in SDN, the control functionality, including routing decisions, is centralized on a controller.
The controller determines the routing paths and policies for network traffic flow based on global network conditions and policies, then communicates these decisions to the data plane devices for forwarding.
Making a routing decision = looking up destination route, which is an action done for a message....this a data plane process
However creating routing table is a control plane process, hence A
Official Cert Guide Vol 2 Page 360
"The term control plane refers to any action that controls the data plane. Most of these
actions have to do with creating the tables used by the data plane, tables like the IP routing
table, an IP Address Resolution Protocol (ARP) table, a switch MAC address table, and so
on. By adding to, removing, and changing entries to the tables used by the data plane, the
control plane processes control what the data plane does. You already know about many
control plane protocols—for instance, all the IP routing protocols."
A SDN consists of control, data, and management planes. The control plane performs forwarding decisions and other functions, like quality of service (QoS). In contrast, the data plane is the network that switches or forwards devices handling the data packets and taking inputs from the control plane.
https://www.splunk.com/en_us/blog/learn/control-plane-vs-data-plane.html#:~:text=It%20is%20responsible%20for%20routing,path%20for%20forwarding%20network%20traffic.
C. Makes a routing decision
In an SDN (Software-Defined Networking) architecture, the function of making routing decisions is centralized on a controller. In SDN, the control plane, which involves tasks such as making routing decisions and managing network traffic, is separated from the data plane. The SDN controller is responsible for making decisions about how data should be forwarded through the network. This centralized control allows for more dynamic and programmable network management.
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