Month: April 2009

Three-state process model

Posted onCategoriesOperating System

Three-state process model is constituted of READY, RUNNING & WAITING. Processes, also known as tasks entering the system must initially go into the READY state before they enter the RUNNING state. Processes normally leave the system from the RUNNING state. For each of the three states, the process occupies space in main memory. In READY Read More …

Circuit switching

Posted onCategoriesComputer Networks

In circuit switching, a connection is established between two network nodes before they begin transmitting data. Bandwidth is dedicated to this connection and remains available until the users terminate communication between the two nodes. While the nodes remain connected, all data follows the same path initially selected by the switch. This works much like a Read More …

Three types of network topology

Posted onCategoriesComputer Networks

Bus Topology – This topology consists of a Backbone cable connecting all nodes on a network without intervening connectivity devices. The single cable is called Bus and can support only one channel for communication; as a result, every node shares the bus’s total capacity. On a Bus Topology network, devices share the responsibility for getting Read More …