Distributed database directory refresh strategies, commonly recommended for the X.500 standard, are defined and analytically modeled for variations on push/pull and total/differential under idealistic asynchronous control conditions. The models are implemented in a HyperCard-based tool called DirMod (for "directory model"). Experimental test results show important elapsed time performance tradeoff among the different strategies, and live test data contribute to the verification of the models.
The Network Modeling Tool (NetMod) uses simple analytical models to provide the designers of large interconnected local area networks with an in-depth understanding of the potential performance of these systems. This tool will be-useful in either a university, industrial, or governmental campus networking environment with thousands of computer sites. NetMod is implemented in easy-to-use Macintosh software packages such as Microsoft Excel and HyperCard, a Pc version of the tool will also be made available. The objectives of the tool. the analytical models, and its user interface are described in detail along with its application to an actual campus-wide network.
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