Computer Network also called Network is a group of computers and other devices connected to each other to share resources electronically. Networks can be as small as two computers or many thousand computers that are connected to one another. These computers are usually connected to one another through wires, satellite, and modems. Each device connected to the network is called a “node”, and the computer […]

COMPUTER NETWORKS 4TH MARCH 2012 Examination Paper Answer ALL questions. Clearly cross out surplus answers. Time: 2 hours Any reference material brought into the examination room must be handed to the invigilator before the start of the examination. ANSWER ALL QUESTIONS Marks QUESTION 1 a) State FOUR (4) principles underpinning the Open Systems Interconnection (OSI) Reference Model. b) Describe the purpose of the physical layer […]

Introduction: CareGroup was established in 1996 from a three-way merger of several hospitals in the eastern Massachusetts area. The merger was driven by the intense financial pressure and competitiveness in the healthcare community. CareGroup was the second largest hospital group in the area, and was a force to be reckoned with in the war of medical costs that included healthcare providers and employers. Problem: On […]

Introduction OSI layers 1. Physical – Data unit: bit The Physical Layer defines electrical and physical specifications for devices. It defines the relationship between a device and net, example cable (copper or optical ), pins, hubs, repeaters, network adapters and more. 2. Data Link – Data unit: frame The Data Link Layer provides the means to transfer data between network device and to detect and […]