What are the general basics for how a network scan is performed?

Holm Security uses an inference-based scan engine to find vulnerabilities. Each scan begins with a pre-scan module which accurately fingerprints a host. The fingerprinting is performed by sending a series of specially crafted packets to the host and by interpreting the results. Holm Security is able to identify the host operating system, services running and ports opened. Once this information has been captured, the inference-based scan engine selects only the appropriate vulnerability checks to run, runs them, and interprets the results. This approach, consisting of the pre-scan and the inference-based scan engine, accelerates the scanning process, minimizes traffic load on your network and touching your systems, and improves overall accuracy. 

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