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Active probes are traffic tests that are initiated by the CNA system. You identify a specific host in a prefix of interest and the CNA system will contact it, either by initiating and immediately closing a TCP session, or by sending an ICMP echo request, at regular intervals. The time it takes to complete the opening handshake of the TCP session or complete the ICMP ping is recorded in the CNA database. (You can configure the method used: TCP or ICMP.)
See Chapter 4: Server-Based Measurement in the CNA Basic Monitoring Guide for more information.
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