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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CNT5106C Computer Networks‚ Summer 2010 Instructor: Prof. Ahmed Helmy Homework #1 On the Internet Architecture‚ Elementary Queuing Theory and Application Layer I. Internet and layered protocol architecture: Q1. (5 points) In the layered protocol architecture the transport layer functionality includes congestion control and error recovery (e.g.‚ retransmission). One suggested that this functionality should be done strictly at the end points (i.e.‚ at the hosts) without aid from the network. Do you
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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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Professional and ethical issues c a S eS inc lu de d in t hiS Se ction 3 . . . . . . . . . . . . . . . . 3.1 A Day in the Life of Brent Dorsey Staff Auditor Professional Pressures 59 63 65 71 79 3.2 Nathan Johnson’s Rental Car Reimbursement Solving Ethical Dilemmas–Should He Pocket the Cash? Recognizing It’s a Fraud and Evaluating What to Do . . . . . . 3.3 The Anonymous Caller 3.4 WorldCom The Story of a Whistleblower . . . . . . . . . . . . . . . . . . . . . . . .
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Working Computers‚ Inc. Jennifer Sobieski‚ an analyst in the headquarters of Working Computers‚ Inc.‚ has been asked to evaluate whether or not Working should sell a division of the firm which has been losing market share and requires a great deal of new investment to remain competitive. The ailing product is a Personal Data Appliance (PDA) that once led the market in features and innovation‚ only to fall prey to competition from numerous firms once it had paved the way for the product category
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456 Chapter Eleven Appendix 11B Illustrative Audit Case: Keystone Computers & Networks‚ Inc. Part III: Substantive Tests—Accounts Receivable and Revenue This part of the audit case illustrates the manner in which the auditors design substantive tests of balances. The substantive tests are illustrated for two accounts—receivables and revenue. This aspect of the audit is illustrated with the following audit documentation: • ABC’s risk assessment working paper that combines the auditors’ assessments
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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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Introduction Apple Inc. is a company that focuses on development and marketing of personal computers‚ media devices‚ design‚ and portable digital music players. Also‚ the company sells a variety of related software‚ services‚ peripherals‚ networking solutions‚ and third-party digital content and applications. The company ’s portfolio of offerings comprises Mac computing systems‚ iPods line of portable digital music and video players‚ iPhone handsets and iPad portable multimedia and computing devices
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