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This test emulates a client accessing a DNS server to issue a query. The query can either request the DNS server to resolve a domain name to an IP address or vice versa. Based on the response reported by the server, measurements are made of the availability and responsiveness of the DNS server.

The DNS service is organized hierarchically, i.e., one DNS server can forward a client request to another server to resolve the client's query. To ensure that the results of the query reflect the state of a DNS server in isolation, a non-recursive query is issued by this test. The measures made by this test are as follows:

Measurement	Description	Measurement Unit	Interpretation
Availability	Whether a successful response is received from the DNS server in response to the emulated user request.	Percent	An availability problem can be caused by different factors - e.g., the server process may not be up, a network problem may exist, or there could be a configuration problem with the DNS server.
Response_time	Time taken (in seconds) by the server to respond to a request.	Secs	An increase in response time can be caused by several factors such as a server bottleneck, a configuration problem with the DNS server, a network problem, etc.