hey people i came back! with new hard questions i want to learn this : for example think of a hotel network and i want to put some network devices in it . There are cisco switches and some other basic switches in the world. when i try to build a hotel network , do i have to use powerful switches such as cisco switches or basic switches ? ............. Considering that you didn't get what i said above , i give a new example. when you have a home network and going to the internet you can use dsl routers (not a real router exactly , have many ports only but they are not as powerful as cisco 2600 , 3200 ones and in a hotel should i use cisco routers ?