Review SessionChapter 5 Data Communications and Internet TechnologySlide 3Slide 4Understand how data is converted to electric signals Break into pieces, add header data control of each layer.ChecklistExerciseTypes of NetworksSlide 9Computation ProblemsChapter 6 Systems DevelopmentSDLCReview Session•Chapter 5 Networking •Chapter 6 System DevelopmentChapter 5 Data Communications and Internet Technology•5-layer network architecture•The Internet and related concepts•Enterprise Networks / Subnet•Wireless Technologies5-layer architectureRead: page 119 ~ 121 for details. Figure 5-4 (page 119)Application LayerTransport LayerInternet LayerData Link LayerPhysical LayerComputer AInternet LayerData Link LayerPhysical LayerComputer BRouter A Internet LayerData Link LayerPhysical LayerRouter N Application LayerTransport LayerInternet LayerData Link LayerPhysical LayerPoint-to-pointPoint-to-pointEnd-to-endLayer 1: physical connectivity. Road and busesLayer 2: how to communicate with your neighbors (control traffic and reduce error of physical layer) truck-driver: deliver the package to the next station.Layer 3: an overall connectivity map + routing algorithm. Allow connectivity of one network to another. Logistic manager (knows how to connect all the transit stations, and inform the truck driver where to send the mail to the next transit station)Layer 4: establish end-to-end connectivity between any two computers (may notbe in the same network, connected by the 3rd layer) clerk (receive your mail, and notify you whether the mail can be sent through)Layer 5: allow software (application programs) to talk to each other once layer 4 connection is established. CorrespondentsLayer 1: physical connectivity. Road and busesLayer 2: how to communicate with your neighbors (control traffic and reduce error of physical layer) truck-driver: deliver the package to the next station.Layer 3: an overall connectivity map + routing algorithm. Allow connectivity of one network to another. Logistic manager (knows how to connect all the transit stations, and inform the truck driver where to send the mail to the next transit station)Layer 4: establish end-to-end connectivity between any two computers (may notbe in the same network, connected by the 3rd layer) clerk (receive your mail, and notify you whether the mail can be sent through)Layer 5: allow software (application programs) to talk to each other once layer 4 connection is established. CorrespondentsUnderstand how the 5 layers work togetherUnderstand how data is converted to electric signalsBreak into pieces, add header data control of each layer.Checklist•Basic concepts:–Computer network–LAN/WAN/internet Internet–VPN, Tunneling, Intranet/Extranet•Technical terms: e.g. UTP, Twisted Pair Lines, Ethernet, TCP, UDP, etc.•Domain Names: describe the type of website based on the domain name.•IEEE 802 and the protocols•How to use DOS command the check your IP address?•IPv4: 32 bits. Identify a valid IP address.•Internet future of the Internet. (slides 42)•Institutions / Organizations–Department of Defense / NSF / ICANN / ISO / IETF / IEEEExercise•Which of the following can be an IP address? (explain why)–144.37.2.3–144.144.144–144.2.3.30.40–144.37.2.267Types of Networks•LAN: (IEEE 802)–wired: three basic topologies (pros and cons, slides 21)–wireless: WiFi ~ IEEE802.11(advantage of wireless)•WAN – connecting to remote locations–leased lines / use the publicly available networks (e.g. telephone network, Internet), pros and cons(page 126, figure 5-12, WAN part)IEEE Standard A.K.A Range SpeedWPAN IEEE802.15Bluetooth~30 feet 1MbpsWLANIEEE 802.11Wi-Fi~ 300 ft11~54Mbps~802.11b11Mbps(slower)~802.11g54Mbps(interference)WMAN IEEE 802.16 Wi-Max ~ 30 miles 75MbpsWWAN IEEE802.20 N/A N/A N/AWireless Computer Networks (radio wave)Computation Problems•Speed computationTime = Total Data Volume / Effective speed(conversion: 1B=8 bits, 1KB = 8*1024 bits, etc.)•Subnet mask:–How many computers in the subnet? 2n–Given the number of computer, figure out n, convert to subnet mask.Chapter 6 Systems Development•The concept of Systems Development–Range of systems development, complexity compared to program development•Risks and challenges associated with systems development•System Development Methods–SDLC–RAD–OOD–XPFull name of the four methods. Characteristics of those methods (particularly the first two).SDLC•The most formal way to set up a large Information System•Widely adopted methods by large organizations•5 formal phases: –System Definition–Requirement Analysis the most important phase–Component Design–Implementation –System MaintenanceDescribe the main activities in each phasesWhat are the inputs for each phase? What are the
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