THE PURPOSE OF A WIDE AREA NETWORK (WAN) is simply to allow any user in the world to connect to any application in the world. In practical terms, a WAN connects local area networks (LANs) across large geographical areas. The classic example is the home office with a data center needing to be connected to branch locations. This was traditionally achieved by each branch having a dedicated connection back to the home office to connect to the data center. This hub (i.e., the home office) and spoke (i.e., branch offices) is very reliable and has been the main network ...
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