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During an active reconnaissance phase, a penetration tester is using a tool to gather information about valid usernames on a target system. Which of the following activities best describes this process?
User enumeration
OS fingerprinting
DNS lookup
Packet crafting
Enumeration involves the discovery of hosts, services, domains, users, and other resources on a network. Identifying valid usernames falls directly under the category of user enumeration, which is a specific type of enumeration activity aimed at gathering user-related information from a target system. This information can be important for subsequent phases of a penetration test, including crafting user-specific attacks or social engineering efforts.
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