I'm a newbie for these kind of things so forgive me if I say something wrong :) suppose we have 3 access-points and they all have physical cable back to server, I want to have 1 expanded network (SSID="MyWirelesssNet"). so what is the difference between using full mesh WDS or just rename all of the APs to "MyWirelesssNet". what is the best method?
Best is to set all of them with the same SSID, and dont forget to put them in different channels (or set them to "auto channel" if they support that) to avoid interferences. When client devices will connect, they will choose the best access point themselves.
Mesh/WDS is for the case when you don't have ethernet cables to the server, so the access points uses WIFI to another wire-connected access point to reach the server. It's better to avoid it when possible because it has severe impact on WIFI performance.