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EIU CIS 3200 - CIS 3200 Review For Final

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Review For FinalNetwork Architecture ModelsOSI Reference ModelSummary QuestionsInternetworkingSlide 6Slide 7Fundamentals of Data & SignalsSlide 9AttenuationFrequency, Bandwidth (See Fundamentals of Data & Signals – Continued ppt notes for details if needed)Conducted and Wireless MediaSlide 13Local Area Networks LAN ManagementSlide 15ServersPrint ServiceSlide 18Ethernet standardsSlide 20Automatic Inheritance of Access RightsSlide 22The InternetSlide 24IP addressSlide 26IP Address structureSlide 28Network classesHost nameDomain Name System (DNS)AutoconfigurationSlide 33Slide 34Slide 35Slide 36Review For Final© Abdou Illia, Spring 2010Network Architecture Models3OSI Reference Model7 layersEach layer communicate with its peer layer, and with layer above and below it.Different protocols at each layerUpper layer deal with application issues, and are implemented in softwareLower layers handle data transport issues, and are implemented in software and hardwareApplicationData transport4Summary Questions1. (a) Name the 7 layers of the OSI model, (b) Name OSI layers that deal with application issues ? (b) Name the OSI layer that deal with data transport issue ?Answer: See previous slide2) Application programs used at the application layer of the OSI Model include word processing. T / F3) Upper layers of the OSI Model are usually implemented in hardware devices. T / FInternetworking6Summary Questions1. The local area network shown in Figure 8-18 (p. 261) has two hubs (X and Y) interconnecting the workstations and servers. What workstations and servers will receive a copy of a packet if the following workstations/servers transmit a message:Workstation 1 sends a message to workstation 3:Workstation 2 sends a message to Server 1:Server 1 sends a message to workstation 3:2. Replace hub Y with a switch. Now, what workstations and servers will receive a copy of a packet if the following workstations/servers transmit a message:Workstation 1 sends a message to workstation 3:Workstation 2 sends a message to Server 1:Server 1 sends a message to workstation 3:7Summary Questions3. Do Internetworking Exercise 2The exercise is available in the Notes section. Check the link next to the Internetworking II ppt notes (posted on Thu 2/4)Fundamentals of Data &Signals9Summary Questions1. Distinguish between digital and analog signalsAnswer: (see class notes for details if needed):Analog: Continuous waveform, State of signal (voltage level, etc.) varies continuously among an infinite number of statesDigital: Discrete (non-continuous) waveform, State of signal remain constant during each clock-cycle, Few possible states2. Distinguish between digital and binary transmissionAnswer: Digital: Few possible states (2-64 states) Binary: 2 states10AttenuationA signal starts at a transmitter with 10 watts of power and arrived at a receiver with 5 watts of power. Calculate the loss of power in dB.1. dB = 10 log10 (P2 / P1) 2. dB = 10 log10 (5/10)3. dB = 10 log10 (0.5)4. dB = 10 (-0.3)5. dB = -3Q: What is the decibel loss of a signal that starts at 50 watts and experiences a 10-watt loss over a given section of cable ?Q: What is the decibel loss of a signal that loses half its power during the course of transmission ?11Frequency, Bandwidth(See Fundamentals of Data & Signals – Continued ppt notes for details if needed)Q: What is the frequency (in Hz) of a signal that repeats 80000 times within one minute ? Answer: 80000 / 60 = 1333.33 HzQ: What is the bandwidth of a signal composed of frequencies from 50 Hz to 500 Hz ? Answer: |500 Hz – 50 Hz | = 450 HzConducted and WirelessMedia13Summary QuestionsWhat does cross talk interference mean ? How can crosstalk interference be reduced ?If transmission wires are placed side by side, electromagnetic radiation is emitted by one wire and picked up by the other. Twisting pair of wire reduce crosstalk interference.What categories of twisted pair are usually used in LANs ?Categories 3, 4, 5, 6, 7, 8What are the advantages and disadvantages of STP compared to UTP ?Advantage: better level of isolation from interference. Disadvantage: costWhat is the main difference between Baseband coaxial cable and Broadband coaxial cable ?Baseband transmit signals in a single channel, whereas broadband uses multiple channels.What are the advantages of Optical fiber compared twisted pair and coaxial cable ?Speed, No significant noise, No interference, Long distanceCan you transmit video signal over twisted pair wire ? ExplainYes, you can (e.g. Digital Video Service or DVS). Noise used to be a limiting factor.Local Area NetworksLAN ManagementSchool of BusinessEastern Illinois University15Summary QuestionsWhat are the four factors to take into account in deciding how many servers to use to implement a LAN’s services?Answer: Optimization, reliability, security, costTo what two devices does a print server usually connect? Answer: To a printer via a parallel or USB cable, and to a hub/switch via UTP or other transmission media. In print service with a print server device, where does a print job go when it leaves the client PC (not counting the hub or switch)? Answer: The print job first goes to the computer where the print queue manager program is installed, which puts it in a print queue. Do you have to use special printers for print service?Answer: You do not need special printers, because all printers come with a parallel and/or USB port that could be used.16ServersSingle server Versus Multiple specialized Servers–Decision based on Cost, Optimization, Reliability, and SecurityOptimization: –File servers need storage capacity and rapid access–Client/Server applications need very fast processors17Print ServiceA Print Server device is basically: NIC + a parallel or USB port + Random Access Memory + Intelligence to receive data and commands from print queue manager program.Note: Possible to connect printer directly to file server, but people might have to walk far to get their printout.Network printers have built-in NIC & print server hardware18Summary QuestionsAnswers are in Week8SummaryQuestionsS10.doc (Review section of course Website - Check Review Exam 2 link)Your organization has 12 employees, each with his or her own stand-alone PC running Windows 98. Each computer has a 10 Mbps NIC that could work with coaxial cable or twisted pair. a) List all the additional hardware and software you would have to buy to


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