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Penetration Testing: Protecting Networks and Systems by Kevin M. Henry

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CHAPTER 4: ACTIVE RECONNAISSANCE AND ENUMERATION

Active reconnaissance is the next critical step in the pen testing process. During this step, the pen tester will learn crucial information about the characteristics of the target system (and perhaps even about the administrators’ diligence in monitoring, patching and configuring the systems properly).

Active reconnaissance is the actual probing of the system to learn how it is configured, what possible points of entry there are for the pen tester and what services or vulnerable points may be found.

Active reconnaissance may consist of several types of tests, including port scans, operating system fingerprinting, and Transmission Control Protocol (TCP) scanning. It can be compared to knocking on ...

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