They need to make sure your building is easy to move around in. Beyond the building itself, architecture and design can help bring balance to people's lives. ... Well-designed schools create better learning environments. Workplaces with good architecture experience higher productivity.
        
             
        
        
        
<span>The equivalent of the TTL(Time to Live) field in an IPv4 header is known as the Hop Limit in an IPv6 header.
</span>The IPv6 header is a streamlined version of the IPv4
header. The field Hop Limit has the size of 8 bits and indicates the maximum number of links
over which the IPv6 packet can travel before being discarded. 
        
             
        
        
        
Vertical alignment determines the position of the text within a section of a document relative to the top and bottom margins, and is often used to create a cover page.
 
        
             
        
        
        
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.