A computer network connects multiple computers and devices to allow communication and sharing of resources. There are different types of networks including local area networks (LANs) within a single building, metropolitan area networks (MANs) within a city, and wide area networks (WANs) across large distances like countries. Common network topologies include bus, ring, star, tree and mesh configurations. Computer networks enable file sharing, printer sharing, collaboration, remote access, data protection, and centralized administration.

1. COMPUTER NETWORK & ITS BUSINESS APPLICATIONS

5. TYPES OF NETWORKS LOCAL AREA NETWORK METROPOLITAN AREA NETWORK WIDE AREA NETWORK

9. Comparison of LAN, MAN, WAN

10. NETWORK ARCHITECTURE

14. Differences

15. NETWORK TOPOLOGY

21. Differences limited limited many Number of nodes when extending network average difficult easy Ease of adding or removing nodes depends on the host. It is easier to repair the problematic host. However, if the nodes fail, then each node has to be searched depends on backbone. If there is a backbone, troubleshooting is difficult. If there is no backbone, the focus is on the two nodes not communicating difficult. Need to search for the problematic node one by one Ease of troubleshooting network can still run network will fail network can still run Node failure network will fail network will fail network can still run Host failure no yes It has no connection between the nodes. Connection between nodes yes depends on network needs depends on network needs Host existence there is a central host and all nodes connect to it all computers and other devices are connected in a circle there is a single central cable (backbone) and all computers and other devices connect to it Structure Star Topology Ring Topology Bus Topology