Abstract
This chapter discusses a set of network protocols that are not suited to moving bulk data among machines, but are particularly valuable in adding features and improving the performance of distributed applications. They act as auxiliary protocols to help applications become more responsive and scalable. These protocols can be used to determine if computers are connected to the network or if there are alternative computers with which to communicate. Three everyday utility protocols, DNS, WHOIS, and Ping, are described in the chapter. These utility protocols can be used to test quickly if machines are online, what domain names or hosts are associated with them, and who is the registrant of the domain name. This provides vital extra information that ultimately adds value to the final product. The surprisingly versatile Microsoft technology, Windows Management Instrumentation (WMI), can pull virtually every conceivable piece of technical information from a remote computer over. WMI is an absolutely essential technology for internal IT support.
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