Final answer:
Public IP addresses are used over WAN networks, and VPN technology ensures secure data transmission and anonymity.
Explanation:
Public IP addresses are used over an open network, such as a WAN, where data is transmitted over the internet. These IPs are accessible to anyone on the network. VPN (Virtual Private Network) technology is commonly used to establish secure tunnels over WAN to protect data from interception and eavesdropping. While connected to a VPN, the web page host sees the user's IP address as that of the VPN server, enhancing anonymity.
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