If you don't have a CCNA and network admin, call Cisco to find one or just ask your question there. That large a lab must have had a design document and folk that implemented it. That is, you would never find such a large system without a designer and/or a CCNA.
i am a maths teacher, converted to computer teacher to manage a lab consisting 180 system all connected to 4 of cisco 48-ports switch. the switches are looped and connected to a router that takes network to the lab. how can i connect a server that will display a common homepage in all 180 system.