To ensure the wireless network is secure, you should implement WPA2 (Wi-Fi Protected Access II).
WPA2 is currently one of the strongest forms of wireless security available and is widely recommended for securing wireless networks.
Here’s a quick comparison of the options you provided:
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WEP (Wired Equivalent Privacy): This is an outdated and insecure protocol that can be easily breached. It should be avoided.
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WPA (Wi-Fi Protected Access): This is better than WEP but still has vulnerabilities compared to WPA2.
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WPA2: This is more secure than both WEP and WPA and provides better data protection and network access control.
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NAT (Network Address Translation): NAT is not a wireless security method; it is used for connecting multiple devices on a local network to the internet and is not a replacement for wireless security protocols.
Thus, WPA2 is the best choice for securing your friend's wireless network.