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 of the OSI Reference Model. c) State THREE (3) elements
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COMPUTER NETWORK ADMINISTRATOR A computer network (the "network") is the connection of at least two or more computers for the purpose of sharing data and resources. These resources can include printers‚ Internet access‚ file sharing‚ and electronic mail ("e-mail"). In today ’s technological environment‚ most companies and businesses have some kind of network used on a daily basis. Thus‚ it is imperative to day-to-day operations that networks run smoothly. Companies employ at least one person
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match the cable type of the network. Most common hubs interconnect Category 3 or 5 twisted-pair cable with RJ-45 ends‚ although Coax BNC and Fiber Optic BNC hubs also exist. Ethernet Hubs An Ethernet hub is also called a multiport repeater. A repeater is a device that amplifies a signal as it passes through it‚ to counteract the effects of attenuation. Multistation Access Unit A Multistation Access Unit (MAU) is a special type of hub used for token ring networks. Switches Switches are
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COMPUTER COMMUNICATION NETWORKS Objectives • • • • • What is telecommunication History of telecommunication Role of telecommunication in Organizations Interpersonal communication applications Computer networks What is telecommunication? “Transmission of data or audible/visible information by electrical/electronic means” e.g. telephone‚ telegraph‚ radio‚ television‚ computer networks (Internet) Basic elements 1. Transmitter : takes information and converts it to a signal 2. Transmission
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A network topology that is generally in a line formation‚ which uses several devices that are all connected to a common central cable called a bus and commonly used for LAN’s. Component Description Usually 2 or more desktop of notebook computers with a network interface card. A common printer is shared by all desktops or notebook computers. The server process requests and delivers data to the client computers over the internet or network.
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transmission medium. Different carries frequencies are assigned to different users. We can use any modulation scheme to assign carrier frequency. Example: FDM can also be used to combine signals before final modulation onto a carrier wave. In this case the carrier signals are referred to as subcarriers: an example is stereo FM transmission‚ where a 38 kHz subcarrier is used to separate the left-right difference signal from the central left-right sum channel‚ prior to the frequency modulation of the
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CRU Computer Rental Case Solutions Solution 1 TABLE 1: CRU FLOWS | Customer | Receiving | Status 24 | Status 40 | Stored Orders | Orders at Suppliers | Status 41 | Status 42 | Status 20 | | | | | | | | | | | Throughput(Units/Week) | 1000 | 1000 | 1000*.70=700 | 1000*.30+ .15*700= 405 | 405 | 405 | 405 | 405 | 1000 | | | | | | | | | | | Inventory(Units) | 8000= 8*1000 | 500 | 1500 | 1000 | 500 | 405= 405*1 | 500+405 = 905 | 500 | 2000=2*1000 | | | | | |
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Case 1-1: Ribbons an’ Bows‚ Inc. Note: This case is unchanged from the Twelfth Edition. Approach This is an introductory case and it should be taught as an introductory case. There will be plenty of time in the course for the students to learn the correct form of financial statements and details of accounting standards. In short‚ the instructor should be prepared to allow a variety of formats for the financial statements and tolerate some “not quite correct” accounting. The instructor
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internal control over financial reporting c a S eS inc lu de d in t hiS Se ction 5 155 155 165 169 177 185 195 5.1 Simply Steam‚ Co. 5.2 Easy Clean‚ Co. . . . . . . . . . . . . . . . . . . . . . . . . . . . Evaluation of Internal Control Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Evaluation of Internal Control Environment . . . . . . . . . . . . . . . . . . . . . . . . 5.3 Red Bluff Inn & Café 5.4 St. James Clothiers Establishing Effective Internal
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Introduction There is a profound effect of the computer revolution to our school‚ our home and our society in general. Computers plays a big role in different application such as airline industry‚ medicine‚ banking industry‚ television and movies‚ factory‚ offices‚ schools‚ business and even at home. Businesses are using computers to improve their efficiency‚ reduce their cost of operation‚ and to have a more timely and accurate reports. Indeed‚ computer as a result‚ produce a variety of benefits that
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