if any computer fails it doesn't affect the entire system
Star topology.
A star topology is a method of connecting several computers to one another in a network. The cables used in a star topology are twisted pair cables or coaxial cables. Coaxial cables would be the cheapest solution.
bus topology.
Bus star ring mesh hybrid
Star Topology
Ring Topology, Mesh Topology, Bus Topology, Star Topology
The most common LAN topology is that of a "star." In a star topology, each computer, or "node", is connected to a central hub. This is more reliable than a more classical "ring" topology, because a node failing will not bring down the entire network. A bus topology is arguably more reliable, but has poorer performance.
STAR-Bus
The shape of a network is commonly referred to as its "topology." Network topology describes the arrangement of different elements (nodes, links) in a network and can be classified into various types, such as star, ring, bus, mesh, and hybrid. Each topology has its own advantages and disadvantages in terms of performance, scalability, and fault tolerance.
Star network,ring network,tree network,bus network
Star Topology, where Hubs can act as repeaters.
STAR Topology