A network is two or more computers linked together, it is used to share information across an organisation.
Types of Network
LocaL Area Network (LAN), Wide Area Network (WAN), Metropolitan Area Network (MAN) and Home Area Network (HAN).
A network topology is used to describe the layout of a computer network. Each has its own characteristics.
A Bus Topology has a start and end point. Data packets are sent out along the bus with the address of the receiver. All of the nodes on the network read every message to find out if they are the intended recipient.
A Ring Topology involves all computers being connected to form a ring. Packets are passed from the sender through each computer until it reaches the recipient.
A Star Topology involves all nodes being connected to a central node. Messages are passed to the central node and then to the recipient. If the central node (a hub, switch or router) is broken, the network cannot function.
A Mesh Topology means that each node must be connected to at least 2 other nodes. If one link is broken, packets can still reach where they need to go, through a different link.
A Fully Meshed Topology means that every node must be connected to every other node. If one link is broken, packets can still reach where they need to go, through a different link.
A Tree Topology is a number of star networks linked together. The internet uses a tree topology.