In the early days, public Wi-Fi networks often resembled the Wild West, where ARP spoofing attacks that allowed renegade users to read other users' traffic were common. The solution was to build cryptographic protections that prevented nearby parties—whether an authorized user on the network or someone near the AP (access point)—from reading or tampering with the traffic of any other user.
延迟 — 用户需要等待响应，速度取决于网络连接质量
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Last year, Natural Resources Wales said building a flood defence wall was "not economically viable".
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