In our example, we have made some simplifications. Specifically, if the DNS system worked as we just described it is not difficult to see that the root servers would receive an enormous amount of traffic. In practice this problem is solved in two ways. First, the “clients” in our example will cache all answers it receives. This means that once it has received the addresses for “se” from the root server it is able to query these servers directly for addresses within the “se” zone in the future. Secondly, the “clients” are usually not applications or even individual workstations but rather a server located close to the.
