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User traffic tests (UTTs) are passive measurements of the time it takes to complete a TCP handshake during the delivery of a single-pixel transparent GIF that has been requested by an Internet user who has contacted your web site. This test requires that you place an HTML image tag somewhere on your web page, and that you configure your DNS server to direct requests for the URL contained in the image tag to one of your USTAT modules.
See Chapter 4: Server-Based Measurement in the CNA Basic Monitoring Guide for more information.
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