Network threats constantly evolve, which makes network safety a unending course of. Network directors can see networks from each bodily and logical perspectives. The bodily perspective entails geographic locations, physical cabling, and the network parts (e.g., routers, bridges and application layer gateways) that interconnect via the transmission media. Logical networks, known as, within the TCP/IP architecture, subnets, map onto one or more transmission media. For example, a common apply in a campus of buildings is to make a set of LAN cables in each constructing appear to be a common subnet, using VLAN technology. The nodes of a computer network can embody private computers, servers, networking hardware, or other specialized or general-purpose hosts.
Networks could additionally be characterised by many properties or features, corresponding to physical capability, organizational objective, user authorization, entry rights, and others. Another distinct classification methodology is that of the bodily extent or geographic scale. Ethernet is a family of technologies used in wired LANs. It is described by a set of requirements together called IEEE 802.3 published by the Institute of Electrical and Electronics Engineers. There are many communication protocols, a number of of that are described beneath. An Ethernet repeater with a number of ports is called an Ethernet hub.