Case 4) Living dangerously
If your BSP provides you with multiple IP addresses and you don't mind not having a firewall between your computers and the Internet, then you can use an Access Point instead of a router as the heart of your network. But since the Access Point will need an IP address of its own, be sure you get enough IP addresses to cover the number of clients that you'll have in your WLAN, plus one IP address for the Access Point.
Figure 4 - All wireless network using multiple IPs and Access Point
The main advantage of this method is not cost savings, but the ability for each of your network clients to have full access to all Internet ports and services. If you want multiple LAN users to have simultaneous access to on-line games, or video or audio conferencing applications (Netmeeting, etc.), you may want to consider this method.
Although we include this option for the sake of completeness, we really don't recommend using it unless you are aware of the dangers of having your computers directly connected to a full-time broadband Internet connection and know how to protect yourself!