Partial Service Outages
Some services provide only a single function. For example, POP has the sole purpose of allowing a user to download mail from a mail server. A system administrator easily can determine when a single-function service is down and the repercussions of that outage for the business. In the POP example, an outage means users get an error message when they try to download their mail.
Other services provide more functionality and, therefore, can present a more complex diagnostic and maintenance issue. A Web server, in addition to providing simple static Web pages, can also support file uploading; CGI scripts can process forms, and code on the back end can interface with databases. Add SSL to this mix, and you have an entirely separate ...
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