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Vertical scanning = Scanning all ports on one or more host ..and Horizontal scannig =scanning one port on many host. When someone is performing vertical scanning, he/she is interested in any open ports and launching an attack on it from a Database of vulnerabilities. The objective is to attack , no matter what kind of attack it is. On the other hand - horizontal scanning attempts to launch a particular type of attack , so it is interested in only a particular open port in different host. Vertical scanning has more number of ports to scan than horizontal scanning. Hence it takes more time - making it slower than horizontal scanning.

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Q: Why is the vertical scanning very slow in comparison to horizontal scanning?
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