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Answer and Explanation:
Messages flow across an SDN controller's:
Northbound APIs:
• Messages which help in read/write state of the network and developing flow tables within the
state management layer.
• Notifications for the state-change events.
• The interaction between the controller and network control applications is done through the
northbound interface.
• Network control applications send messages to the controller.
Southbound APIs:
• Messages which help for the up-to-date view of the network's state like message for the
attached link has gone up or down, new devices are joined the network, or indications of the
device is up or down.
• Controller's southbound interface is the communication among the controller and the controlled
devices. Controlled devices are the recipients of the messages sent form the controller.
Answer:
The complete method is as follows:
public List buildList(List L)
{
L.insert(30);
L.insert(23);
L.insert(19);
L.insert(4);
return L;
}
Explanation:
To complete the method, we make use of the insert() function.
This inserts elements of the list into list L. However, we have to start from the last element (i.e. in descending order)
So, the explanation is as follows:
L.insert(30); --- This inserts the last element
Continue inserting in descending order
<em> L.insert(23); </em>
<em> L.insert(19);
</em>
Until the first list element is inserted
L.insert(4);
This returns the filled list L
return L;
<span>The designer will ask him or herself during the problem statement stage what the audience or user already knows about the problem. A. Identify the need or problem.</span>