Until now, we have seen only simple directory architectures. We had a single directory server holding the whole directory and serving a number of clients. However, life is rarely so simple, and you probably have a somewhat more difficult implementation in place.
A single directory server is not always sufficient to meet your requirements. Sometimes it is necessary to keep a copy of the same data at different locations to optimize access speed. There are many good reasons to do so, and we will discuss them later in greater detail. For now, let us review a few without further comment. For example, one reason could be to bring the server closer to the clients. This is helpful in the case of a wide-area network ...
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