A network is a group of two or more computers linked together for the purpose of sharing resources. Each type of network requires its own combination of hardware and software to allow it to function. Network Characteristics Topology, protocol, and architecture are three characteristics that can be used to categorize networks. The geometric, physical arrangement of the computer network. Common topologies include a bus, star, and ring.
Bus networks are relatively inexpensive and easy to install for small networks.
Ethernet systems may use a bus topology. Ring topologies are relatively expensive and difficult to install, but they offer high bandwidth and can span large distances. All devices are connected to a central hub. Star networks are relatively easy to install and manage, but bottlenecks can occur because all data must pass through the hub. Ethernet systems may also use a star topology.