my first blog

  computer network   A   computer network   is a set of   computers   sharing resources located on or provided by   network nodes . The computers use common   communication protocols   over   digital   interconnections   to communicate with each other. These interconnections are made up of   telecommunication network   technologies, based on physically wired, optical, and wireless radio-frequency methods that may be arranged in a variety of   network topologies . The nodes of a computer network may include  personal computers ,  servers ,  networking hardware , or other specialised or general-purpose  hosts . They are identified by  network addresses , and may have  hostnames . Hostnames serve as memorable labels for the nodes, rarely changed after initial assignment. Network addresses serve for locating and identifying the nodes by communication protocols such as the  Internet Protocol . Computer networks may be classified by many criteria, including the  transmission medium  used to