A captive portal controls network access by requiring users to view or interact with a web page before Internet access is granted. It is a common method for implementing guest Wi-Fi networks, ensuring users accept legal terms or log in. Other answers might sound plausible, but they do not correctly describe the primary function of a captive portal.
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How does a captive portal work?
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What are some common use cases for captive portals?
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How does a captive portal differ from other network authentication methods?