design a company LAN? For example: a company LAN, A total of 50 computers, a total of 5 buildings, and each buildings of 10 computers, each floors of 2 computers, each 1,000-meter distance, Painting and list of equipment and models, and characters description why

There are several Cisco Press books available how to design a LAN. Look for Multiservice Switching books and Design. Or, contact me directly, we can discuss the details of something like this, it would require too much efforts here to talk about all the details necessary. (my email is : crys1000@gmail.com)