What is the best network solution for a campus design? Which topology should we use and why? Which devices should be useful for reliable network?

VLAN with Star topology is best. With VLAN we can define seperate LAN and prevent broadcast message.Cisco 3900 and 2900 series are bes

Hirerarchical model That Cisco recommends with cisco Devices. Layerd approch.

Core Distribution and Access Layers.The 6500 serious core switches the 3500 distrubution and access layer you have to choose  based on your campus requirment.

VLAN with Star topology is best. With VLAN we can define seperate LAN and prevent broadcast message.Cisco 3900 and 2900 series are best.

You can you use star topology. You can use cisco 2960 switches and configure VLANs to avoid broadcasting in your networks.

Thanks

WAN with star topological LAN and routers interconnected in LAN