if the wide area network (wan) is supporting converged applications like voice over internet protocol (voip) internet protocol (ip) routing lookups will be even more essential to the assurance of the network. 
Understanding WAN
WAN stands for Wide Area Network is a network that is used as a network that connects between local networks.  Local computer networks are not only physically adjacent to each other, but share the same group of IP addresses.  
The local network can be one room, one office or even one city.  While the WAN itself is a network that connects these local networks within a city, province or even between countries.  The difference between WAN and LAN networks is in the type of media used.  Generally local networks or LANs use similar network media.
 While the WAN is connected to devices with different transmission media and protocols.  The WAN coverage area is also very wide, but unites the network as if it were in one room.  WAN networks have lower data transfer rates than local networks or LANs. WAN network technology relies on companies providing long-distance telecommunications services.  WAN networks use many kinds of network technologies with a mix of analog and digital signals for data transmission.  Of course this is different from a local network or LAN which uses a connection between computers that are physically connected to each other with the same protocol and transmission media.  The components in the WAN and their functions will be discussed later.
Learn more about WAN at brainly.com/question/14793460.
#SPJ4.
 
        
             
        
        
        
Probably c or a with the question your asking
        
             
        
        
        
The user needs to complete the entire disk surface first before starting another surface.
Explanation:
When you are using a multiple disk storage system to write the data the disk automatically writes the disk based on the algorithm for better efficiency and availability of the disk space.
hence when you are recording a data on a multiple disk storage system, it is recommended to fill the complete disk surface initially before you start the another surface to record the data.