Network Design
Our final area of consideration in causes of downtime is that of fail-over mechanisms. Routing protocols, hot standby protocols, and bridging protocols are all examples of fail-over mechanisms. We should think about two considerations when predicting the availability of a network or segment running a particular fail-over mechanism. First, we must account for the time it takes to perform the fail-over. Second, we should account for the possibility that the fail-over mechanism itself fails. Because this is an introductory level book, however, our coverage will assume that fail-over mechanisms work. We will only discuss inclusion of the time it takes for a fail-over to occur and the associated downtime.
For our introductory level ...
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