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17-20 from the following list name the four elements indicated in the diagram of the Excel workbook window.( 2 marks) Formula bar, AutoSum button, Paste Function button, Active cell, Toolbar, Sheet tab, Format Menu, Sort button, Name box A B C D 17. A Sort Button (on the standard toolbar) 18. B Name Box (On the formula bar) 19. C Active Cell (in this case A1) 20. D Sheet TAB
SECTION B (Short answer questions) 15 points each 1. What is a communication network What are the disadvantages of a network A communication network is a group of interconnected computers that share resources such as peripherals, disk space, processing power etc using a common set of protocols over a shared communication medium such as Co-axial cable, Unshielded Twisted Pair Cable (UTP) or Fibre Optic Cable, the medium could also be wireless using Satellite, Microwave or radio frequency technologies. The largest network in the world is based on the IP (Internet Protocol) suite and is known as the internet. Resources may be shared on a peer-to-peer or a client/server basis. With the client/server model, the server has the resource and makes it available to the clients – this is common practice for sharing disk space (file server) and printers (printer server). Application servers allow users to run applications on a remote machine thus making use of the servers CPU and memory instead of that of the local machine. Servers may be installed to provide services for local users only (INTRANET), for a wider but specific audience such as business partners (EXTRANET) or to the whole of the community of interconnected networks (INTERNET). In the peer-to-peer model both participants have resources that are shared by the other on an equal basis, thus people can copy files to each other’s disks or use messaging systems to communicate with each other using peer-to peer software. Napster and similar file sharing systems allow people to share music and files over a peer to peer network. Networks can be classified by the area that they cover: Local area networks (LANs) are confined within a small area such as a classroom Campus Area Networks (CANs) cover a college Campus, Metropolitan area networks (MANs)cover a town while wider areas are serviced by Wide Area Networks (WANs). The disadvantages of networks include: • Cost of installation • On-going cost of maintenance • The need for trained experts to provide the installation and maintenance • The need for a reliable stable electricity supply • The need to secure data and equipment so that only authorized users can access them. • The danger of propagation of viruses, worms and other malware through the network. • Server failure, cable failure or other network component failure may prevent access to resources upon which people have come to rely. • As network use increases the performance may degrade unless the network is properly designed, maintained and continually upgraded.
Page 1: Candidate’s Index No. JUNE 2006 G
Page 5: 4. In the worksheet below use stand

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