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Excellent summary jda5id!
For the folks who "see" a network and can't get in, there are many reasons:
1. WEP enabled.
2. MAC filtering.
3. DHCP disabled. (Rare, but sometimes very practical.)
4. DHCP limited.
I use 1, 2 and 4. I have WEP enabled, use MAC filtering and only allow 4 connections to my home network. (My desktop, my wife's desktop, my laptop and my Ax.) Two are hard wired, the laptop is usually connected by wire, but can do wireless and the Ax is wireless only.
I also changed SSID and password and don't broadcast my SSID.
It's not bulletproof, but my neighbor's network is wide open, so I feel relatively safe.
(I also have a home intrusion alarm and a sign out front to that effect and he doesn't so I'm the tougher target both for the network and the TV viewer!)
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